CN115632133A - Cobalt/cobalt oxide catalyst for hydrogen fuel of fuel cell and preparation method thereof - Google Patents

Cobalt/cobalt oxide catalyst for hydrogen fuel of fuel cell and preparation method thereof Download PDF

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CN115632133A
CN115632133A CN202211354112.8A CN202211354112A CN115632133A CN 115632133 A CN115632133 A CN 115632133A CN 202211354112 A CN202211354112 A CN 202211354112A CN 115632133 A CN115632133 A CN 115632133A
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cobalt
catalyst
carbon cloth
cobalt oxide
fuel cell
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崔鹏
文龙
吴海荣
欧腾蛟
曹桂军
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Shenzhen Shenke Pengwo Technology Co ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/88—Processes of manufacture
    • H01M4/8878—Treatment steps after deposition of the catalytic active composition or after shaping of the electrode being free-standing body
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/90—Selection of catalytic material
    • H01M4/9016—Oxides, hydroxides or oxygenated metallic salts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/90—Selection of catalytic material
    • H01M4/9041—Metals or alloys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/22—Fuel cells in which the fuel is based on materials comprising carbon or oxygen or hydrogen and other elements; Fuel cells in which the fuel is based on materials comprising only elements other than carbon, oxygen or hydrogen
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

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  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
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Abstract

The invention discloses a cobalt/cobalt oxide catalyst for hydrogen fuel of a fuel cell and a preparation method thereof, wherein the method comprises the following steps: preparing a cobalt/carbon cloth catalyst by using cobalt salt, a reducing agent and carbon cloth in an alkaline environment; locally oxidizing the cobalt/carbon cloth catalyst at high temperature to cobalt/cobalt oxide/carbon cloth catalyst; and (3) carrying out elution treatment on the cobalt/cobalt oxide/carbon cloth catalyst, and drying the solution after the carbon cloth is eluted to obtain the cobalt/cobalt oxide catalyst. The invention prepares the cobalt/cobalt oxide catalyst by a two-step method, and realizes the technical effect of improving the hydrogen preparation efficiency.

Description

Cobalt/cobalt oxide catalyst for hydrogen fuel of fuel cell and preparation method thereof
Technical Field
The invention relates to the technical field of catalysts, in particular to a cobalt/cobalt oxide catalyst for hydrogen fuel of a fuel cell and a preparation method thereof.
Background
Proton Exchange Membrane Fuel Cells (PEMFC) are a new type of device that can convert chemical energy directly into electrical energy. The proton exchange membrane battery has higher energy conversion efficiency because the internal energy of the non-rotating part is not consumed and is not combusted, and the energy conversion efficiency is not limited by Carnot cycle. Moreover, the proton exchange membrane battery adopts clean energy, such as hydrogen fuel, and has no harm to the environment and high environmental protection. The proton exchange membrane battery also has the characteristics of mild working conditions, small volume, light weight, safety and durability, is widely used as a mobile power supply, and is also an ideal power supply.
At present, the preparation of hydrogen fuel for proton exchange membrane fuel cells is receiving more and more attention from various countries. The hydrogen fuel has rich sources, and can be prepared by utilizing the water electrolysis hydrogen production technology. The hydrogen production process is mainly realized by two steps of adsorption and desorption, but most of the existing catalysts are biased to one side, so that the efficient adsorption and desorption hydrogen production is difficult to realize.
Disclosure of Invention
The invention mainly aims to provide a cobalt/cobalt oxide catalyst for hydrogen fuel of a fuel cell and a preparation method thereof, and aims to solve the problem of low absorption and desorption efficiency in the hydrogen production process.
To achieve the above object, the present invention provides a method for preparing a cobalt/cobalt oxide catalyst for hydrogen fuel of a fuel cell, the method comprising:
preparing a cobalt/carbon cloth catalyst by using cobalt salt, a reducing agent and carbon cloth in an alkaline environment;
locally oxidizing the cobalt/carbon cloth catalyst at high temperature to cobalt/cobalt oxide/carbon cloth catalyst;
and (3) carrying out elution treatment on the cobalt/cobalt oxide/carbon cloth catalyst, and drying the solution after the carbon cloth is eluted to obtain the cobalt/cobalt oxide catalyst.
Optionally, the step of preparing a cobalt/carbon cloth catalyst using a cobalt salt, a reducing agent and a carbon cloth in an alkaline environment comprises:
placing cobalt salt, sodium hydroxide, a reducing agent and carbon cloth in ultrapure water, and continuously stirring at normal temperature to obtain a cobalt/carbon cloth catalyst;
carrying out ultrasonic oscillation treatment on the cobalt/carbon cloth catalyst to remove sodium hydroxide impurities;
and (3) placing the cobalt/carbon cloth catalyst with the sodium hydroxide impurities removed in a vacuum furnace, and drying for 2h at 50 ℃.
Optionally, the step of high temperature local oxidation of the cobalt/carbon cloth catalyst to a cobalt/cobalt oxide/carbon cloth catalyst comprises:
placing the cobalt/carbon cloth catalyst in a tubular furnace, and heating from room temperature at a heating rate of 5 ℃/min;
and keeping the temperature for 4 hours after the temperature rises to 500 ℃ to obtain the cobalt/cobalt oxide/carbon cloth catalyst.
Optionally, the step of performing elution treatment on the cobalt/cobalt oxide/carbon cloth catalyst, and drying the solution after the carbon cloth elution to obtain the cobalt/cobalt oxide catalyst comprises:
placing the cobalt/cobalt oxide/carbon cloth catalyst in an ultrasonic oscillator for continuous oscillation for 2 hours, and filtering out a cobalt/cobalt oxide solution;
and (3) placing the cobalt/cobalt oxide solution in a vacuum furnace, drying at 50 ℃ for 3-5 h, and preparing to obtain the cobalt/cobalt oxide catalyst.
Optionally, the cobalt salt is cobalt chloride or cobalt acetate.
Optionally, the reducing agent is sodium borohydride or lithium dimethylaminoborohydride.
Optionally, the carbon cloth has a size of 2cm × 2cm.
Alternatively, the ratio of the cobalt salt to the reducing agent is 1.
In addition, in order to achieve the above object, the present invention also provides a cobalt/cobalt oxide catalyst for a fuel cell hydrogen fuel, which is prepared using the above-described cobalt/cobalt oxide catalyst preparation method for a fuel cell hydrogen fuel.
Optionally, the cobalt/cobalt oxide catalyst has a cobalt: the cobalt oxide is 1.
The cobalt/cobalt oxide catalyst for the hydrogen fuel of the fuel cell and the preparation method thereof provided by the invention have the advantages that the cobalt/cobalt oxide catalyst is prepared by a two-step method, the cobalt salt is reduced by using a reducing agent to prepare the cobalt catalyst, and then the local cobalt catalyst is oxidized at high temperature to prepare the cobalt/cobalt oxide catalyst.
Drawings
FIG. 1 is a schematic flow diagram of one embodiment of a method for preparing a cobalt/cobalt oxide catalyst for use in a fuel cell hydrogen fuel according to the present invention;
FIG. 2 is an XRD performance diagram of a cobalt/cobalt oxide catalyst according to the present invention;
FIG. 3 is a graph of hydrogen evolution test performance for example 1 of the present invention;
FIG. 4 is a graph of hydrogen evolution test performance of comparative example 1 of the present invention;
FIG. 5 is a graph of hydrogen evolution test performance of comparative example 2 of the present invention;
FIG. 6 is a graph of hydrogen evolution test performance of comparative example 3 of the present invention;
FIG. 7 is a graph showing the hydrogen evolution test performance of comparative example 4 of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. It should be apparent that the described embodiments are only some of the embodiments of the present invention, and not all of the embodiments.
The proton exchange membrane fuel cell is widely researched due to the outstanding advantages of high energy density, environmental friendliness, convenience in carrying and the like, the fuel is a clean energy source of hydrogen, however, the problems of metal particle poisoning and transmission obstruction of the nano-scale catalyst and high preparation cost of the catalyst exist in the mechanism of stability attenuation of the existing hydrogen production catalyst, and in addition, the traditional catalyst has low activity and is difficult to meet the requirements of practical application, the specific surface area is small, the active area is limited, and mass production and application cannot be realized.
In the process of hydrogen production by water electrolysis, the balance between hydrogen proton adsorption and desorption has an important influence on the hydrogen production efficiency, and although the catalyst can promote the hydrogen production process, the hydrogen production efficiency is reduced due to the deviation of either adsorption or desorption.
The embodiment of the invention provides a preparation method of a cobalt/cobalt oxide catalyst for hydrogen fuel of a fuel cell, and referring to fig. 1, fig. 1 is a flow schematic diagram of an embodiment of the preparation method of the cobalt/cobalt oxide catalyst for hydrogen fuel of the fuel cell.
In this embodiment, the preparation method of the cobalt/cobalt oxide catalyst for hydrogen fuel of a fuel cell includes:
step S10, preparing a cobalt/carbon cloth catalyst by using cobalt salt, a reducing agent and carbon cloth in an alkaline environment;
the alkaline environment can be provided by sodium hydroxide, a reducing agent is used for reducing cobalt salt to prepare a cobalt catalyst, and carbon cloth can be used as a carrier to support the cobalt catalyst.
In some possible embodiments, the step of preparing the cobalt/carbon cloth catalyst using a cobalt salt, a reducing agent, and a carbon cloth in an alkaline environment may include:
step a, placing cobalt salt, sodium hydroxide, a reducing agent and carbon cloth in ultrapure water, and continuously stirring at normal temperature to obtain a cobalt/carbon cloth catalyst;
b, performing ultrasonic oscillation treatment on the cobalt/carbon cloth catalyst to remove sodium hydroxide impurities;
and c, placing the cobalt/carbon cloth catalyst with the sodium hydroxide impurities removed in a vacuum furnace for drying treatment at 50 ℃ for 2 hours.
The cobalt salt used may be cobalt chloride or cobalt acetate, and the reducing agent may be sodium borohydride or lithium dimethylaminoborohydride. The mass ratio of the cobalt salt to the reducing agent is 1. 0.3g to 0.8g of cobalt chloride, 1g to 3g of sodium hydroxide, 0.5g to 1g of sodium borohydride and 2cm multiplied by 2cm of carbon cloth are placed in 100mL of ultrapure water and are continuously stirred for 1 hour at normal temperature, so that the cobalt/carbon cloth catalyst is prepared. And (3) putting the cobalt/carbon cloth catalyst into ultrapure water for ultrasonic oscillation washing for 30min to remove sodium hydroxide impurities. And (3) placing the washed cobalt/carbon cloth catalyst in a vacuum furnace, and drying for 2h at 50 ℃ to obtain the pure and dry cobalt/carbon cloth catalyst.
Step S20, the cobalt/carbon cloth catalyst is locally oxidized into cobalt/cobalt oxide/carbon cloth catalyst at high temperature;
the cobalt catalyst is biased to hydrogen proton adsorption in the hydrogen production process, and the cobalt/cobalt oxide catalyst can be prepared by oxidizing the local cobalt catalyst at high temperature, so that the adsorption and desorption processes of the hydrogen protons are balanced.
In some possible embodiments, the step of high temperature partial oxidation of the cobalt/carbon cloth catalyst to a cobalt/cobalt oxide/carbon cloth catalyst may comprise:
d, placing the cobalt/carbon cloth catalyst in a tubular furnace, and heating from room temperature at a heating rate of 5 ℃/min;
and e, keeping the temperature for 4 hours after the temperature rises to 500 ℃ to obtain the cobalt/cobalt oxide/carbon cloth catalyst.
The cobalt is partially oxidized by gradually raising the temperature, and at high temperature, the cobalt is partially oxidized by oxygen in the air to generate cobalt oxide, so that the cobalt/cobalt oxide/carbon cloth catalyst is obtained.
And S30, carrying out elution treatment on the cobalt/cobalt oxide/carbon cloth catalyst, and drying the solution after the carbon cloth is eluted to obtain the cobalt/cobalt oxide catalyst.
The carbon cloth is used as a carrier for carrying the catalyst, and can be removed by elution treatment after the cobalt oxide is prepared, the main solute in the eluted solution is cobalt/cobalt oxide, and the cobalt/cobalt oxide catalyst can be obtained by drying the solution.
In some possible embodiments, the step of subjecting the cobalt/cobalt oxide/carbon cloth catalyst to an elution treatment and drying to obtain the cobalt/cobalt oxide catalyst may include:
f, placing the cobalt/cobalt oxide/carbon cloth catalyst in an ultrasonic oscillator for continuous oscillation for 2 hours, and filtering out a cobalt/cobalt oxide solution;
and step g, placing the cobalt/cobalt oxide solution in a vacuum furnace, drying at 50 ℃ for 3-5 h, and preparing the cobalt/cobalt oxide catalyst.
The elution process can be carried out in an ultrasonic oscillator, the carbon cloth is separated from the cobalt/cobalt oxide by sufficient oscillation, and the separated cobalt/cobalt oxide forms a cobalt/cobalt oxide solution. And drying the cobalt/cobalt oxide solution at a lower temperature for a certain time to prevent the cobalt from being further oxidized to generate excessive cobalt oxide, thereby obtaining the cobalt/cobalt oxide catalyst. The finally obtained cobalt/cobalt oxide catalyst takes metal cobalt as a substrate, the conductivity during contact can be improved, and the cobalt oxide covered by the outer layer further enhances the hydrogen adsorption and hydrogen desorption capacity of the catalyst, so that the catalytic performance is greatly improved.
In this embodiment, a two-step method is used to prepare the cobalt/cobalt oxide catalyst, the reducing agent is used to reduce the cobalt salt to prepare the cobalt catalyst, and then the local cobalt catalyst is oxidized at a high temperature to prepare the cobalt/cobalt oxide catalyst.
The embodiment of the invention also provides a cobalt/cobalt oxide catalyst for hydrogen fuel of a fuel cell, which is prepared by using the preparation method of the cobalt/cobalt oxide catalyst for hydrogen fuel of a fuel cell. Fig. 2 is a graph showing XRD (X-Ray Diffraction) performance of the cobalt/cobalt oxide catalyst obtained by the above-mentioned preparation method, in fig. 2, the abscissa represents 2 θ angle and the ordinate represents Diffraction intensity, and it can be seen from fig. 2 that the prepared product has Diffraction peaks of Co and CoO, and it can be confirmed that the product is a cobalt/cobalt oxide catalyst. Cobalt in cobalt/cobalt oxide catalyst: the cobalt oxide may be 1.
Example 1
(1) 0.3g of cobalt chloride, 1g of sodium hydroxide, 0.5g of sodium borohydride and 2cm multiplied by 2cm of carbon cloth are placed in 100mL of ultrapure water and stirred for 1 hour at normal temperature, so that the Co/carbon cloth catalyst is prepared.
(2) And then putting the prepared Co/carbon cloth into ultrapure water, and performing ultrasonic oscillation for 30min to remove impurities such as sodium hydroxide and sodium borohydride.
(3) And then the washed Co/carbon cloth catalyst is placed in a vacuum furnace for drying treatment for 2 hours at 50 ℃.
(4) The prepared Co/carbon cloth catalyst is placed in a tubular furnace, and is heated from room temperature at the heating rate of 5 ℃/min, and is kept at 500 ℃ for 4 hours, so that the sample Co/CoO/carbon cloth catalyst is prepared.
(5) And placing the prepared Co/CoO/carbon cloth catalyst in an ultrasonic oscillator for continuous oscillation for 2 hours to filter out a Co/CoO solution.
(6) And (3) placing the Co/CoO solution in a vacuum furnace, and drying for 3h at 50 ℃ to prepare the Co/CoO catalyst.
FIG. 3 is a graph of the performance of the hydrogen evolution test of example 1, with the abscissa representing the overpotential in mV and the ordinate representing the current density in mA/cm 2 . As can be seen from FIG. 3, the current density of example 1 varied relatively smoothly, and the difference between the extreme values of the current density was relatively small at 10mA/cm 2 Under the current density, the overpotential is only 44mV, the energy consumption is small, and the hydrogen evolution performance is good.
Comparative example 1
(1) 0.5g of cobalt chloride, 2g of sodium hydroxide, 0.7g of sodium borohydride and 2cm multiplied by 2cm of carbon cloth are placed in 100mL of ultrapure water and stirred for 1 hour at normal temperature, so that the Co/carbon cloth catalyst is prepared.
(2) And then putting the prepared Co/carbon cloth into ultrapure water, and performing ultrasonic oscillation for 30min to remove impurities such as sodium hydroxide and sodium borohydride.
(3) And then the washed Co/carbon cloth catalyst is placed in a vacuum furnace for drying treatment for 2 hours at the temperature of 50 ℃.
(4) The prepared Co/carbon cloth catalyst is placed in a tubular furnace and heated from room temperature at the heating rate of 5 ℃/min and the temperature of 500 ℃ for 4 hours to prepare a sample Co/CoO/carbon cloth catalyst.
(5) And placing the prepared Co/CoO/carbon cloth catalyst in an ultrasonic oscillator for continuous oscillation for 2 hours to filter out a Co/CoO solution.
(6) And (3) placing the Co/CoO solution in a vacuum furnace, and drying for 4h at 50 ℃ to prepare the Co/CoO catalyst.
FIG. 4 is a graph of hydrogen evolution test performance of comparative example 1, with the abscissa representing overpotential in mV and the ordinate representing current density in mA/cm 2 . As can be seen from FIG. 4, the current density of comparative example 1 varied greatly and remained after reaching a certain extreme valueThe extreme value difference of the current density is large in fluctuation and is 10mA/cm 2 Under the current density, the overpotential is 53mV, the energy consumption is large, and the hydrogen evolution performance is poor.
Comparative example 2
(1) 0.8g of cobalt chloride, 3g of sodium hydroxide, 1g of sodium borohydride and 2cm multiplied by 2cm of carbon cloth are placed in 100mL of ultrapure water and stirred continuously for 1h at normal temperature to prepare the Co/carbon cloth catalyst.
(2) And then putting the prepared Co/carbon cloth into ultrapure water, and performing ultrasonic oscillation for 30min to remove impurities such as sodium hydroxide and sodium borohydride.
(3) And then the washed Co/carbon cloth catalyst is placed in a vacuum furnace for drying treatment for 2 hours at the temperature of 50 ℃.
(4) The prepared Co/carbon cloth catalyst is placed in a tubular furnace, and is heated from room temperature at the heating rate of 5 ℃/min, and is kept at 500 ℃ for 4 hours, so that the sample Co/CoO/carbon cloth catalyst is prepared.
(5) And placing the prepared Co/CoO/carbon cloth catalyst in an ultrasonic oscillator, and continuously oscillating for 2h to filter out a Co/CoO solution.
(6) And (3) placing the Co/CoO solution in a vacuum furnace, drying at 50 ℃ for 5 hours, and preparing the Co/CoO catalyst.
FIG. 5 is a graph of hydrogen evolution test performance of comparative example 2, with the abscissa representing overpotential in mV and the ordinate representing current density in mA/cm 2 . As can be seen from FIG. 5, the comparative example 2 has a large variation in current density and a large difference in current density extremum at 10mA/cm 2 Under the current density, the overpotential is 87mV, the energy consumption is large, and the hydrogen evolution performance is poor.
Comparative example 3
(1) 0.3g of cobalt chloride, 1g of sodium hydroxide, 0.5g of sodium borohydride and 2cm multiplied by 2cm of carbon cloth are placed in 100mL of ultrapure water and stirred for 1 hour at normal temperature, so that the Co/carbon cloth catalyst is prepared.
(2) And then putting the prepared Co/carbon cloth into ultrapure water, and performing ultrasonic oscillation for 30min to remove impurities such as sodium hydroxide and sodium borohydride.
(3) And then the washed Co/carbon cloth catalyst is placed in a vacuum furnace for drying treatment for 2 hours at the temperature of 50 ℃.
(4) The prepared Co/carbon cloth catalyst is placed in a tubular furnace, and is heated from room temperature at the heating rate of 5 ℃/min and is kept at 800 ℃ for 4 hours to prepare a sample CoO/carbon cloth catalyst.
(5) And placing the prepared CoO/carbon cloth catalyst in an ultrasonic oscillator for continuous oscillation for 2h to filter out a CoO solution.
(6) And (3) placing the CoO solution in a vacuum furnace, and drying for 3h at 50 ℃ to prepare the CoO catalyst.
FIG. 6 is a graph of hydrogen evolution test performance of comparative example 3, with the abscissa representing overpotential in mV and the ordinate representing current density in mA/cm 2 . As can be seen from FIG. 6, the comparative example 3 has a large variation in current density and a large difference in current density extremum at 10mA/cm 2 Under the current density, the overpotential is 84mV, the energy consumption is large, and the hydrogen evolution performance is poor.
Comparative example 4
(1) 0.3g of cobalt chloride, 1g of sodium hydroxide, 0.5g of sodium borohydride and 2cm multiplied by 2cm of carbon cloth are placed in 100mL of ultrapure water and stirred continuously for 1 hour at normal temperature to prepare the Co/carbon cloth catalyst.
(2) And then putting the prepared Co/carbon cloth into ultrapure water, and performing ultrasonic oscillation for 30min to remove impurities such as sodium hydroxide and sodium borohydride.
(3) And then the washed Co/carbon cloth catalyst is placed in a vacuum furnace for drying treatment for 2 hours at the temperature of 50 ℃ to prepare the Co catalyst.
FIG. 7 is a graph of hydrogen evolution test performance of comparative example 4, with the abscissa representing overpotential in mV and the ordinate representing current density in mA/cm 2 . As can be seen from FIG. 7, comparative example 4 has a large variation in current density, a large fluctuation in current density, and a large difference in current density extremum at 10mA/cm 2 Under the current density, the overpotential is 78mV, the energy consumption is large, and the hydrogen evolution performance is poor.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of other like elements in a process, method, article, or system comprising the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields are also included in the scope of the present invention.

Claims (10)

1. A method for preparing a cobalt/cobalt oxide catalyst for a fuel cell hydrogen fuel, characterized in that the method for preparing a cobalt/cobalt oxide catalyst for a fuel cell hydrogen fuel comprises the steps of:
preparing a cobalt/carbon cloth catalyst by using a cobalt salt, a reducing agent and carbon cloth in an alkaline environment;
locally oxidizing the cobalt/carbon cloth catalyst at high temperature to cobalt/cobalt oxide/carbon cloth catalyst;
and (3) carrying out elution treatment on the cobalt/cobalt oxide/carbon cloth catalyst, and drying the solution after the carbon cloth is eluted to obtain the cobalt/cobalt oxide catalyst.
2. The method of preparing a cobalt/cobalt oxide catalyst for a fuel cell hydrogen fuel of claim 1, wherein the step of preparing a cobalt/carbon cloth catalyst using a cobalt salt, a reducing agent and a carbon cloth in an alkaline environment comprises:
placing cobalt salt, sodium hydroxide, a reducing agent and carbon cloth in ultrapure water, and continuously stirring at normal temperature to obtain a cobalt/carbon cloth catalyst;
carrying out ultrasonic oscillation treatment on the cobalt/carbon cloth catalyst to remove sodium hydroxide impurities;
and (3) placing the cobalt/carbon cloth catalyst with the sodium hydroxide impurities removed in a vacuum furnace, and drying for 2h at 50 ℃.
3. The method of making a cobalt/cobalt oxide catalyst for a fuel cell hydrogen fuel of claim 1, wherein the step of high temperature partial oxidation of the cobalt/carbon cloth catalyst to a cobalt/cobalt oxide/carbon cloth catalyst comprises:
placing the cobalt/carbon cloth catalyst in a tubular furnace, and heating from room temperature at a heating rate of 5 ℃/min;
after the temperature rises to 500 ℃, the temperature is kept for 4 hours to obtain the cobalt/cobalt oxide/carbon cloth catalyst.
4. The method of claim 1, wherein the step of eluting the cobalt/cobalt oxide/carbon cloth catalyst and drying the solution after the carbon cloth elution to obtain the cobalt/cobalt oxide catalyst comprises:
placing the cobalt/cobalt oxide/carbon cloth catalyst in an ultrasonic oscillator for continuous oscillation for 2 hours, and filtering out a cobalt/cobalt oxide solution;
and placing the cobalt/cobalt oxide solution in a vacuum furnace, and drying at 50 ℃ for 3-5 h to prepare the cobalt/cobalt oxide catalyst.
5. The method of claim 1 wherein said cobalt salt is cobalt chloride or cobalt acetate.
6. A method of making a cobalt/cobalt oxide catalyst for a fuel cell hydrogen fuel as claimed in claim 1, wherein the reducing agent is sodium borohydride or lithium dimethylaminoborohydride.
7. The method of making a cobalt/cobalt oxide catalyst for a fuel cell hydrogen fuel of claim 1, wherein the carbon cloth has dimensions of 2cm x 2cm.
8. A process for the preparation of a cobalt/cobalt oxide catalyst for hydrogen fuel cells according to any of claims 1 to 7, characterized in that the ratio of the quantities of cobalt salt and reducing agent species is from 1 to 1.5.
9. A cobalt/cobalt oxide catalyst for hydrogen fuel of a fuel cell, which is prepared by the method for preparing a cobalt/cobalt oxide catalyst for hydrogen fuel of a fuel cell according to any one of claims 1 to 8.
10. The cobalt/cobalt oxide catalyst for a fuel cell hydrogen fuel of claim 9, wherein the cobalt/cobalt oxide catalyst has a cobalt: the cobalt oxide is 1.
CN202211354112.8A 2022-10-28 2022-10-28 Cobalt/cobalt oxide catalyst for hydrogen fuel of fuel cell and preparation method thereof Pending CN115632133A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116892035A (en) * 2023-06-28 2023-10-17 深圳市氢蓝时代动力科技有限公司 Catalyst for preparing hydrogen for fuel cell and application thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116892035A (en) * 2023-06-28 2023-10-17 深圳市氢蓝时代动力科技有限公司 Catalyst for preparing hydrogen for fuel cell and application thereof

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