CN115125547B - Preparation and application of Mo/Nb double-doped Co hollow mesoporous carbon nano-box catalyst - Google Patents
Preparation and application of Mo/Nb double-doped Co hollow mesoporous carbon nano-box catalyst Download PDFInfo
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Abstract
The invention discloses a preparation method of a Mo/Nb double-doped Co hollow mesoporous carbon nano-box catalyst, which comprises the following steps: (1) preparation of a precursor cube ZIF-67; (2) Annealing the product in the step (1) in a tube furnace in an inert gas atmosphere to obtain Co@MCNBs; (3) Mixing and stirring an ethanol solution containing ZIF-67 and an ethanol solution containing cobalt transition metal salt and niobium transition metal salt, carrying out hydrothermal reaction on the mixture by a high-pressure reaction kettle to load niobium element, centrifugally collecting solids, drying the solids in a vacuum oven, and annealing the dried solids in a tube furnace in an inert gas atmosphere to obtain Co (Nb) @ MCNBs; (4) Adding molybdenum transition metal salt ethanol solution into the raw material (3), mixing and stirring, and adopting the preparation method which is the same as that of the raw material (3) to obtain Co (Mo) @ MCNBs; (5) Adding the ethanol solution of the niobium transition metal salt into the raw material of the step (4), mixing and stirring, and preparing the Co (Mo, nb) @ MCNBs by adopting the same method as the step (3). The catalyst has high specific surface area, multiple active sites and good electrochemical performance.
Description
Technical Field
The invention belongs to the technical field of electrolyzed water catalysts, and particularly relates to a preparation method of a Mo/Nb double-doped Co hollow mesoporous carbon nano-box catalyst and application thereof in an electrolyzed water device.
Background
In the 21 st century, along with the development of industry, the exploitation and utilization of energy promoted the civilization progress of mankind, and the demands of various countries for energy are more and more urgent, and the current energy structure mainly has: natural gas, coal, petroleum, and the like. However, over-mining has resulted in rapid exhaustion of fossil energy, a significant energy crisis, environmental pollution and a series of climate problems are also gradually raised out of the water, and thus close attention to ecological crisis is required. It is well known that economic development and energy density are indispensible. Along with the gradual exhaustion of traditional energy sources and the environmental problems of global warming, acid rain, haze and the like brought by the exhaustion, the health life of human beings is seriously influenced, and the potential of continuous growth of national economy is also influenced. The energy source is required to be developed in green and sustainable, and the reasonable design of an efficient renewable energy source conversion system is a key for realizing efficient and sustainable utilization of energy sources. Among them, efficient utilization of natural resources is also a key means, but natural resources existing in the world, such as: solar energy, wind energy, geothermal energy, biomass energy and the like have instability and discontinuity and are limited by regions, and if the solar energy, the wind energy, the geothermal energy, the biomass energy and the like are applied to the whole country on a large scale, the problems of safety and facility waste can exist. The limited and environmentally friendly hazards of petroleum energy sources and applications are unavoidable, and therefore it is extremely necessary to develop an alternative, sustainable, clean energy technology to supply or replace fossil energy sources. The advent of electrochemical energy storage devices can be said to provide a critical direction for solving this problem.
In the age of rapid global economic development, humans are increasingly gaining importance with environmental pollution, which is a non-trivial aspect. Hydrogen is regarded as an alternative energy carrier for replacing fossil fuel energy as a zero-emission energy source, and development planning of hydrogen energy is made in various countries in recent years. The main methods for industrially producing hydrogen are as follows: pyrolysis of natural gas or water gas to produce hydrogen, but in practice, the methods have huge energy consumption and can produce certain pollution to the environment; and the hydrogen production by water electrolysis is safe and reliable, and the produced hydrogen is purer and has little pollution. In comparison, the water electrolysis technique is also particularly important.
The electric energy is obtained through renewable energy sources, then the electric energy is converted into chemical energy by utilizing an electrolysis water technology and is stored in hydrogen, then the hydrogen is split into the whole society, and the chemical energy is converted into the electric energy again through a fuel cell reaction and is utilized, so that a clean and pollution-free new energy system in the whole process based on hydrogen-water circulation can be established. In which hydrogen is present as an energy carrier of high energy density. Hydrogen production by electrolysis of water is an important technical component for achieving this cycle. Traditional methane steam reforming hydrogen production technology, while cheaper, is still dependent in its nature on the use of fossil fuels and can produce and release CO 2 . With the gradual expansion of renewable energy source utilization scaleThe electrolytic water technology has wider application prospect
The method for producing hydrogen by electrolyzing water consists of an anode (oxygen evolution OER) and a cathode (hydrogen evolution HER), and is considered as a very promising method because of the almost zero emission.
Anode: 2H (H) 2 O→O 2 +4H + +4e-
And (3) cathode: 2H (H) + +2e-→H 2
Total reaction: 2H (H) 2 O→O 2 +2H 2
Oxygen Evolution Reaction (OER) mainly comprises three main steps:
(1)H 2 adsorption of O/OH-on the surface of electrocatalyst
(2) Formation of reaction intermediates
(3)O 2 Release of the molecule. In electrolyzed water, the theoretical thermodynamic potential is 1.23V, but because the cell voltage in the electrolyzed water needs an excessive potential, the charge transfer rate of the reaction process is slow, the process of producing hydrogen and oxygen is slow, and the extra consumption of energy is caused, so that the thermodynamic potential is far greater than 1.23V. Noble metals, such as Ru, pt and Ir based materials, due to their large surface area; excellent electrocatalytic reactions and excellent electrical conductivity are ideal choices for fuel cell water splitting processes. However, stability, insufficient sources and cost limit its commercialization. To avoid these problems, scientists have been striving to find easily synthesized and a large number of available alternatives to significantly reduce the excessive potential of OER processes over the last decades. Therefore, the technology of hydrogen production by water electrolysis is in competition with the traditional hydrogen production industry, and a proper, stable and cheap OER/HER catalyst needs to be explored to reduce the extra consumption of energy, keep the over-potential lower, improve the reaction rate and make the water electrolysis process more environment-friendly.
Disclosure of Invention
The invention takes a carbon cube as a conductive network, and metal oxide particles and metal oxyacid salts formed by doping molybdenum and niobium elements are loaded on the conductive carbon network to obtain Mo with high specific surface area, multiple active sites and good electrochemical performanceAnd Nb element double doped Co hollow mesoporous carbon nano box grow oxygen-containing vacancy Co 2 Mo 3 O 8 /Nb 2 O 5 Heterojunction catalyst and application in water electrolysis devices.
In order to achieve the aim of the invention, the invention provides a preparation method of a Mo/Nb double-doped Co hollow mesoporous carbon nano-box catalyst, which comprises the following steps:
step one, preparing cobalt-based zeolite imidazole ester framework material (ZIF-67): mixing cobalt transition metal salt, aqueous solution of cetyl trimethyl ammonium bromide and aqueous solution of dimethyl imidazole, stirring for reaction, centrifuging, and drying in a vacuum oven to obtain a precursor cube ZIF-67;
step two, preparing a Co hollow mesoporous carbon nano-box catalyst (Co@MCNBs): annealing the product obtained in the step one in a tube furnace in an inert gas atmosphere to obtain Co@MCNBs;
step three, growing oxygen-containing vacancy Nb in Co hollow mesoporous carbon nano-box 2 O 5 Preparation of heterojunction catalysts (Co (Nb) @ MCNBs): mixing and stirring an ethanol solution containing ZIF-67 and an ethanol solution containing cobalt transition metal salt and niobium transition metal salt, carrying out hydrothermal reaction on the mixture by a high-pressure reaction kettle to load niobium element, centrifugally collecting solids, drying the solids in a vacuum oven, and annealing the dried solids in a tube furnace in an inert gas atmosphere to obtain Co (Nb) @ MCNBs;
step four, co hollow mesoporous carbon nano-box grows oxygen-containing vacancy Co 2 Mo 3 O 8 Preparation of heterojunction catalysts (Co (Mo) @ MCNBs): mixing and stirring an ethanol solution containing ZIF-67 and an ethanol solution containing cobalt transition metal salt and molybdenum transition metal salt, carrying out hydrothermal reaction in a high-pressure reaction kettle to load molybdenum element, centrifugally collecting solids, drying the solids in a vacuum oven, and annealing the dried solids in a tube furnace in an inert gas atmosphere to obtain Co (Mo) @ MCNBs;
step five, growing oxygen-containing vacancy Co in Co hollow mesoporous carbon nano-box 2 Mo 3 O 8 And Nb (Nb) 2 O 5 Preparation of heterojunction catalysts (Co (Mo, nb) @ MCNBs): mixing ZIF-67-containing ethanol solution with cobalt-containing transition metal salt and molybdenum transition metal saltAnd (3) mixing and stirring ethanol solutions of niobium transition metal salts, carrying out hydrothermal reaction of a high-pressure reaction kettle to load molybdenum element and niobium element, centrifugally collecting solids, drying the solids in a vacuum oven, and annealing the dried solids in an inert gas atmosphere tube furnace to obtain Co (Mo, nb) @ MCNBs.
Preferably, in the first step, the cobalt transition metal salt solution, hexadecyl trimethyl ammonium bromide, dimethyl imidazole and water are mixed according to the mass ratio of 0.2-1:0.2-1:0.2-1:20-40.
Preferably, the mass ratio of ZIF-67, cobalt transition metal salt solution, niobium transition metal salt solution and ethanol in the third step is 0.2-1:0.2-1:0.2-1:10-100.
The mass ratio of ZIF-67, cobalt transition metal salt solution, molybdenum transition metal salt solution and ethanol in the preferred step four is 0.2-1:0.2-1:0.2-1:10-100.
Preferably, the mass ratio of ZIF-67, cobalt transition metal salt solution, molybdenum transition metal salt solution, niobium transition metal salt solution and ethanol in the fifth step is 0.2-1:0.2-1:0.2-1:0.2-1:10-100.
Preferably, the cobalt transition metal salt in step one is Co (NO 3 ) 2 ·6H 2 O、CoCl 2 ·6H 2 O、Co(CH 3 COO) 2 、 CoCl 2 、CoSO 4 ·7H 2 O、CoSO 4 ·H 2 One or more of O.
Preferably, in the second, third, fourth and fifth steps, the inert gas atmosphere is N 2 One or more of Ar, he;
preferably, the annealing process in the second, third, fourth and fifth steps is to heat-preserving for 3 hours at a heating rate of 1 ℃/min to 600-700 ℃ in an inert atmosphere.
The application of the Mo/Nb double-doped Co hollow mesoporous carbon nano-box catalyst as an electrolytic water electrode material applies the Mo/Nb double-doped Co hollow mesoporous carbon nano-box catalyst and the Co hollow mesoporous carbon nano-box to the OER and HER reactions of an electrolytic water device, wherein the metal double-doped mode effectively loads the heterojunction of niobium oxide and molybdenum cobaltate containing oxygen vacancies, and meanwhile, the niobium element plays a role in synergistic promotion, and the heterojunction containing niobium can promote the cooperation with other heterojunction to play the effect of 1+1 & gt2; the presence of oxygen vacancies is more conducive to adsorption of hydroxyl groups, thereby promoting OER reactions; the hollow nano-box structure can expose more active sites, so that the activity of the active sites is improved, and the electrocatalytic performance of the catalyst is improved.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention uses Co source to replace noble metal which is noble metal material such as Pt, ir and Ru base, greatly reduces cost and expands application range.
(2) Currently, the metals which are more studied in electrocatalysts are Fe, ni, V, etc., and the search for some unusual and earth-abundant elements is less. In the invention, we explore the element Nb, nb can form good connection with other active substances in a main phase due to the activity and complex chemical property, and the Nb is a development synergistic accelerator in the field of electrocatalysis.
(3) According to the invention, two heterojunctions are grown outside the Co hollow mesoporous carbon nano-box, so that the appearance of micropores in the original nano-box is not changed, and the grown particles are more uniform and ordered through the chemical synergistic effect among the heterojunctions, so that defects are introduced, the increase of oxygen vacancies is caused, the absorption of hydroxyl is improved, and the electrochemical OER performance is enhanced.
Drawings
FIG. 1 shows that the Mo and Nb element double doped Co hollow mesoporous carbon nano-boxes prepared in example 1 grow oxygen-containing vacancy Co 2 Mo 3 O 8 /Nb 2 O 5 Microcosmic morphology of heterojunction catalyst under Scanning Electron Microscope (SEM);
FIG. 2 is a sample of comparative example 1 and examples 1,2,3 and commercial RuO 2 Linear sweep voltammetric plot (LSV) of Oxygen Evolution Reaction (OER) of the catalyst;
fig. 3 is a linear sweep voltammetric plot (LSV) of Hydrogen Evolution Reaction (HER) for comparative example 1 and example 1,2,3 sample catalysts.
Detailed Description
In order to make the purposes, technical schemes and beneficial technical effects of the invention clearer, the preparation method of the Mo/Nb double-doped Co hollow mesoporous carbon nano-box catalyst and the beneficial effects of the catalyst applied to electrolyzed water are described in detail below with reference to the accompanying drawings and the specific embodiments. It should be understood that the embodiments described in this specification are only for explaining the present invention, and are not intended to limit the present invention, and parameters, proportions, etc. of the embodiments may be selected according to the circumstances without materially affecting the results.
Comparative example 1: the preparation of the Co particle-loaded hollow mesoporous carbon nano-box catalyst specifically comprises the following steps:
(1) Synthesis of ZIF-67:
at 0.292g of Co (NO 3 ) 2 .6H 2 O is a Co source dissolved in 10mL of deionized water (DI) containing 4mg of cetyltrimethylammonium bromide (CTAB). The solution was then rapidly poured into 70mL of an aqueous solution containing 4.54g of 2-methylimidazole (2-MIM) and stirred at room temperature for 30 minutes. The product was collected by centrifugation at 12000rpm for 3 minutes and washed several times with ethanol.
(2) Synthesis of Co particle-loaded hollow mesoporous carbon nano-box catalyst:
the powder obtained above is subjected to argon flow at 1 deg.C for min -1 Is further annealed at 650 c for 3 hours and then naturally cooled to room temperature.
Example 1: the preparation method of the Mo/Nb double-doped Co hollow mesoporous carbon nano-box catalyst specifically comprises the following steps:
(1) Synthesis of ZIF-67:
at 0.292g of Co (NO 3 ) 2 .6H 2 O is a Co source dissolved in 10mL of deionized water (DI) containing 4mg of cetyltrimethylammonium bromide (CTAB). The solution was then rapidly poured into 70mL of an aqueous solution containing 4.54g of 2-methylimidazole (2-MIM) and stirred at room temperature for 30 minutes. The product was collected by centrifugation at 12000rpm for 3 minutes and washed several times with ethanol.
(2) The hollow mesoporous carbon nano-box of Mo and Nb element double-doped Co grows oxygen-containing vacancy Co 2 Mo 3 O 8 /Nb 2 O 5 Synthesis of heterojunction catalyst:
first, 0.06g of ZIF-67 and 5mL of the mixture containing 0.05M (NH 4 ) 2 MoS 4 Dissolved in 20ml of ethanol, and stirred at constant speed for 1h. Then 10ml of Co (NO) 3 ) 2 .6H 2 O (6 mM) and NbCl 5 (3 mM) ethanol solution was slowly dropped into the above solution, followed by stirring at a constant speed for 3 hours. The above solution was then transferred to a Teflon-lined stainless steel autoclave (50 mL) and maintained at 200 ℃ for 6 hours. After cooling to room temperature, the product was collected by centrifugation, washed several times with ethanol and then dried in an oven at 70 ℃. The obtained powder was stirred under argon flow at 1℃for min -1 Annealing at 650 ℃ for 3 hours, and then naturally cooling to room temperature to obtain Co with oxygen-containing vacancy growing in the Mo and Nb element double-doped Co hollow mesoporous carbon nano-box 2 Mo 3 O 8 /Nb 2 O 5 Heterojunction catalysts Co (Mo, nb) @ MCNBs. In the experiment, the tube furnace was kept at constant pressure all the time.
The morphology of the Co (Mo, nb) @ MCNBs material obtained in example 1 was analyzed by Scanning Electron Microscopy (SEM) and as a result, the cubic structure was still maintained and the heterojunction structure was supported on the surface as shown in fig. 1.
Example 2: the preparation method of the Nb-doped Co hollow mesoporous carbon nano-box catalyst specifically comprises the following steps:
(1) Synthesis of ZIF-67:
at 0.292g of Co (NO 3 ) 2 .6H 2 O is a Co source dissolved in 10mL of deionized water (DI) containing 4mg of cetyltrimethylammonium bromide (CTAB). The solution was then rapidly poured into 70mL of an aqueous solution containing 4.54g of 2-methylimidazole (2-MIM) and stirred at room temperature for 30 minutes. The product was collected by centrifugation at 12000rpm for 3 minutes and washed several times with ethanol.
(2) Nb element doped Co hollow mesoporous carbon nano box grows oxygen-containing vacancy Nb 2 O 5 Synthesis of heterojunction catalyst:
first, 0.06g of ZIF-67 was dissolved in 20ml of ethanol and stirred at constant speed for 1h. Then 10ml of Co (NO) 3 ) 2 .6H 2 O (6 mM) and NbCl 5 (3 mM) ethanol solution was slowly dropped into the above solution, followed by stirring at a constant speed for 3 hours. The above solution was then transferred to a Teflon-lined stainless steel autoclave (50 mL) and maintained at 200 ℃ for 6 hours. After cooling to room temperature, the product was collected by centrifugation, washed several times with ethanol and then dried in an oven at 70 ℃. The obtained powder was stirred under argon flow at 1℃for min -1 Annealing at 650 ℃ for 3 hours, and then naturally cooling to room temperature to obtain Nb element doped Co hollow mesoporous carbon nano-boxes growing oxygen-containing vacancies Nb 2 O 5 Heterojunction catalysts Co (Nb) @ MCNBs. In the experiment, the tube furnace was kept at constant pressure all the time.
Example 3: the preparation of the Mo-doped Co hollow mesoporous carbon nano-box catalyst specifically comprises the following steps:
(1) Synthesis of ZIF-67:
at 0.292g of Co (NO 3 ) 2 .6H 2 O is a Co source dissolved in 10mL of deionized water (DI) containing 4mg of cetyltrimethylammonium bromide (CTAB). The solution was then rapidly poured into 70mL of an aqueous solution containing 4.54g of 2-methylimidazole (2-MIM) and stirred at room temperature for 30 minutes. The product was collected by centrifugation at 12000rpm for 3 minutes and washed several times with ethanol.
(2) Mo element doped Co hollow mesoporous carbon nano box grows oxygen-containing vacancy Co 2 Mo 3 O 8 Synthesis of heterojunction catalyst:
first, 0.06g of ZIF-67 and 5mL of the mixture containing 0.05M (NH 4 ) 2 MoS 4 Dissolved in 20ml of ethanol, and stirred at constant speed for 1h. Then 10ml of Co (NO) 3 ) 2 .6H 2 O (6 mM) ethanol solution was slowly added dropwise to the above solution, followed by constant stirring for 3 hours. The above solution was then transferred to a Teflon-lined stainless steel autoclave (50 mL) and maintained at 200 ℃ for 6 hours. After cooling to room temperature, the product was collected by centrifugation, washed several times with ethanol and then dried in an oven at 70 ℃. The obtained powder was stirred under argon flow at 1℃for min -1 Annealing at 650 ℃ for 3 hours, and then naturally cooling to room temperature to obtain the growth of the Mo element doped Co hollow mesoporous carbon nano-boxContaining oxygen vacancies Co 2 Mo 3 O 8 Heterojunction catalysts Co (Mo) @ MCNBs. In the experiment, the tube furnace was kept at constant pressure all the time.
Dual function catalytic performance evaluation:
all electrochemical tests were performed at room temperature using an electrochemical workstation model CHI 760E test system.
Preparation of working electrode: accurately weighing Co containing oxygen vacancy growing in 5mg Co hollow mesoporous carbon nano-box doped with Mo and Nb elements 2 Mo 3 O 8 /Nb 2 O 5 Heterojunction catalyst, 0.5mg of acetylene black and 0.5mg of polyvinylidene fluoride (PVDF), then mixing and dissolving in 750mL of n-methyl-pyrrolidone (NMP), carrying out ultrasonic treatment on the mixture for 30min, finally dripping the prepared ink on the surface of carbon paper with the area of 0.5cm multiplied by 0.5cm, continuously dripping after drying by an infrared lamp, repeating, and finally weighing to obtain the load capacity of about 0.4mg. As a control experiment, commercial RuO 2 The catalyst was also prepared and tested using the same preparation method.
Electrochemical performance test: a standard three-electrode electrochemical test system was used during the test, wherein the counter electrode was a Pt mesh, the reference electrode was a Saturated Calomel Electrode (SCE) and the working electrode prepared as described above.
OER-LSV curves of the samples of comparative example 1 and examples 1,2,3 in 1.0M KOH solution were tested using an electrochemical workstation, respectively, as shown in FIG. 2, the samples of comparative example 1 and examples 1,2,3 were tested at a current density of 10mA cm -2 The OER overpotential were, at time, 284mV, 354 mV,351mV and 317mV, respectively. Under the same test conditions, the ratio of RuO to RuO 2 The overpotential and blank carbon paper of the catalyst are low, which indicates that the Mo and Nb element double-doped Co hollow mesoporous carbon nano-box grows oxygen-containing vacancy Co 2 Mo 3 O 8 /Nb 2 O 5 The heterojunction catalyst sample has excellent OER electrocatalytic activity and can be applied to the anode of a water electrolysis device.
HER-LSV curves of comparative example 1 and examples 1,2,3 samples in 1.0M KOH solution were tested using an electrochemical workstation, respectively, as shown in fig. 2, comparative example 1 and examplesExamples 1,2,3 samples were tested at a current density of 10mA cm -2 When the HER overpotential is 206mV,229mV,314mV and 245mV respectively, the hollow mesoporous carbon nano-box catalyst sample loaded with Co particles has a certain HER electrocatalytic activity, and can be applied to the cathode of the water electrolysis device.
Finally, it should also be stated that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (5)
1. The preparation method of the Mo/Nb double-doped Co hollow mesoporous carbon nano-box catalyst specifically comprises the following steps:
step one, preparing cobalt-based zeolite imidazole ester framework material ZIF-67: mixing cobalt transition metal salt, aqueous solution of cetyl trimethyl ammonium bromide and aqueous solution of dimethyl imidazole, stirring for reaction, centrifuging, and drying in a vacuum oven to obtain a precursor cube ZIF-67;
step two, preparing Co@MCNBs by using a Co hollow mesoporous carbon nano-box catalyst: annealing the product obtained in the step one in a tube furnace in an inert gas atmosphere to obtain Co@MCNBs;
step three, growing oxygen-containing vacancy Co in Co hollow mesoporous carbon nano-box 2 Mo 3 O 8 And Nb (Nb) 2 O 5 Preparation of heterojunction catalysts Co (Mo, nb) @ MCNBs: mixing and stirring an ethanol solution containing ZIF-67 and an ethanol solution containing cobalt transition metal salt, molybdenum transition metal salt and niobium transition metal salt, carrying out hydrothermal reaction in a high-pressure reaction kettle to load molybdenum element and niobium element, centrifuging to collect solid, drying the solid in a vacuum oven, and annealing the dried solid in a tube furnace in an inert gas atmosphere to obtain Co (Mo, nb) @ MCNBs;
in the third step, the mass ratio of ZIF-67, cobalt transition metal salt solution, molybdenum transition metal salt solution, niobium transition metal salt solution and ethanol is 0.2-1:0.2-1:0.2-1:0.2-1: 10-100;
and step two, the annealing process is to heat the material for 3 hours at the temperature rising rate of 1 ℃/min to 600-700 ℃ in inert atmosphere.
2. The preparation method according to claim 1, wherein in the first step, the cobalt transition metal salt solution, cetyltrimethylammonium bromide, dimethyl imidazole and water are mixed according to a mass ratio of 0.2-1:0.2-1:0.2-1:20-40.
3. The process according to claim 1, wherein the cobalt transition metal salt in the first step is Co (NO 3 ) 2 ·6H 2 O、CoCl 2 ·6H 2 O、Co (CH 3 COO) 2 、CoCl 2 、CoSO 4 ·7H 2 O、CoSO 4 ·H 2 One or more of O.
4. The method according to claim 1, wherein in the second and third steps, the inert gas atmosphere is N 2 One or more of Ar and He.
5. The use of the Mo/Nb double-doped Co hollow mesoporous carbon nano-cartridge catalyst according to any one of claims 1 to 4 as an electrolytic water electrode material, wherein the Co (Mo, nb) @ MCNBs is applied to the positive electrode oxygen precipitation OER of an electrolytic water device, and the Co-loaded hollow mesoporous carbon nano-cartridge is applied to the negative electrode hydrogen precipitation HER of the electrolytic water device.
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| Title |
|---|
| Regulation of the electronic structure of Co4N with novel Nb to form hierarchical porous nanosheets for electrocatalytic overall water splitting;Xiaohui chen et. al.;《Materials today physics》;第15卷;100268 * |
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