CN1621822A - Method for measuring hydrogen storage capacity of carbon nanometer tube - Google Patents
Method for measuring hydrogen storage capacity of carbon nanometer tube Download PDFInfo
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- CN1621822A CN1621822A CN 200310112502 CN200310112502A CN1621822A CN 1621822 A CN1621822 A CN 1621822A CN 200310112502 CN200310112502 CN 200310112502 CN 200310112502 A CN200310112502 A CN 200310112502A CN 1621822 A CN1621822 A CN 1621822A
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Abstract
The process of measuring the hydrogen storing amount of carbon nanotube includes the following steps: 1) pressing carbon nanotube in certain amount into carbon nanotube bar; 2) measuring the conductivity coefficient of the carbon nanotube bar; 3) making the carbon nanotube bar absorb hydrogen and measuring the hydrogen storing amount; 4) regulating the number of carbon nanotube and repeating the foregoing three steps to fill hydrogen in different amount and to measuring the different conductivity coefficient; 5) drawing standard conductivity coefficient vs hydrogen storing amount curve based on the datan obtained in the foregoing steps; and 6) pressing carbon nanotube in unknown hydrogen storing amount into carbon nanotube bar and measuring the conductivity coefficient to find out the hydrogen storing amount via checking the standard curve.
Description
[technical field]
The present invention relates to measure the method for hydrogen Storage in Carbon Nanotubes amount.
[background technology]
Carbon nano-tube is a kind of new carbon, is found in 1991 by Japanology personnel Iijima, please refer to " Helical microtubules of graphitic carbon ", S Iijima, Nature, vol.354, p56 (1991).Carbon nano-tube can be regarded the seamless hollow tube that is formed by Graphene lamella convolution as, because Van der Waals force effect carbon nano-tube can auto arrangement become diameter 10～100nm tube bank, and between the multi-wall carbon nano-tube tube wall, exist class graphite linings gap between carbon nano-tube and the carbon nano-tube, the kinetic diameter of the size in these gaps and molecule hydrogen is close (for example, the spacing of multi-wall carbon nano-tube tube wall is 0.34nm, the kinetic diameter of molecule hydrogen is 0.289nm), therefore, in theory the hollow tube inner chamber of Single Walled Carbon Nanotube and the tube bank gap, all can store up hydrogen in multi-walled carbon nano-tubes hollow tube inner chamber and the wall layers gap, so carbon nano-tube is subjected to extensive concern as hydrogen storage material.
At present, to the measurement neither one standard method of hydrogen Storage in Carbon Nanotubes amount.The measuring method of hydrogen Storage in Carbon Nanotubes amount commonly used has volumetric method, gravimetric method etc., wherein volumetric method is that sample is placed in the closed system that hydrogen is housed of known volume, behind the sample storage hydrogen, system pressure will reduce, and change and system bulk is drawn the hydrogen storage content of carbon nano-tube by the equation of gas state according to pressure.But the weak point of this method is obvious: for guaranteeing measuring accuracy, required sample size is bigger; Whether in a single day system leaks, can influence measurement result, therefore need running check system impermeability intact; Temperature produces considerable influence to measurement result, so need the temperature constant of strict control experimentation.
Gravimetric method is to determine the hydrogen storage content of sample by the weight change of sample before and after the direct measurement absorption hydrogen.Gravimetric method needs the high precision balance, often need accurate the adjustment, otherwise measuring result error is bigger; Because the result obtains by direct measurement weight change, needs to avoid any non-hydrogen absorption of sample in the measuring process, therefore too high to the measurement environment requirement, operating difficulties.
Therefore all to be measured environmental impact bigger for two kinds of common method measurement results, and repeatability is relatively poor, and error is big; In addition, these two kinds of methods all be used for measuring pure carbon nano-tube under certain condition the people be the hydrogen storage content that makes behind its storage hydrogen, its objective is the hydrogen storage ability of learning pure carbon nano-tube; And measurement has been adsorbed with the hydrogen content of the carbon nano-tube of hydrogen, then all is difficult to obtain a result with these two kinds of methods.
Therefore, provide a kind of easy to operate, error is less, the measuring method of the hydrogen storage content of the carbon nano-tube of any hydrogen content of energy measurement is real in necessary.
[summary of the invention]
The technical issues that need to address of the present invention are: the measuring method of hydrogen Storage in Carbon Nanotubes amount requires too high, operating difficulties to measurement environment in the prior art, and measurement result repeatability is relatively poor, error big, can only measure pure hydrogen Storage in Carbon Nanotubes amount.The objective of the invention is to solve the problems of the technologies described above, provide a kind of easy to operate, error is less, the measuring method of the hydrogen storage content of any hydrogen content carbon nano-tube of energy measurement.
The technical scheme of technical solution problem of the present invention provides a kind of method of measuring the hydrogen Storage in Carbon Nanotubes amount, and it comprises the following steps:
Step 1 provides an amount of pure carbon nano-tube, with the cold en plaque ingot that all is pressed into of this carbon nano-tube;
Step 2 is measured the electrical conductivity of this en plaque carbon nano-tube ingot;
Step 3 with this en plaque carbon nano-tube ingot suction hydrogen and after recording its hydrogen storage content, is measured its electrical conductivity down with step 2 the same terms;
Step 4, repeating step one to three, the quantity of adjustment carbon nano-tube makes the amounts of hydrogen difference that charges into each time, measures the different electrical conductivitys of the en plaque carbon nano-tube ingot that is adsorbed with different amount hydrogen;
Step 5 is drawn the canonical plotting of electrical conductivity-hydrogen Storage in Carbon Nanotubes amount according to step 2 to four gained data;
Step 6 with the cold en plaque ingot that all is pressed under the carbon nano-tube of a unknown hydrogen content and step 1 the same terms, is measured its electrical conductivity down with step 2 the same terms again, and the canonical plotting of drawing from step 5 finds out the hydrogen storage content of carbon nano-tube.
The present invention has following advantage: the hydrogen storage content of measuring carbon nano-tube by the electrical conductivity of measuring carbon nano-tube, it is less demanding to measurement environment to measure electrical conductivity, easy to operate during measurement, measuring result error is little, can measure the hydrogen storage content of the carbon nano-tube of any unknown hydrogen content.
[description of drawings]
Fig. 1 is the method flow diagram that the present invention measures the hydrogen Storage in Carbon Nanotubes amount.
Fig. 2 is that the present invention is with the cold synoptic diagram that all is pressed into en plaque carbon nano-tube ingot of carbon nano-tube.
Fig. 3 is the synoptic diagram that the present invention measures en plaque carbon nano-tube ingot conductance.
Fig. 4 is that the present invention uses PCT to measure the synoptic diagram that instrument is measured carbon nano-tube ingot hydrogen storage content.
[embodiment]
As shown in Figure 1, measure the method flow diagram of hydrogen Storage in Carbon Nanotubes amount for the present invention.The inventive method comprises the following steps:
Step 1 provides an amount of pure carbon nano-tube, and with its cold en plaque carbon nano-tube ingot that all is pressed into;
Step 2 is measured the electrical conductivity of above-mentioned en plaque carbon nano-tube ingot;
Step 3 is charged into a certain amount of hydrogen for en plaque carbon nano-tube ingot, and measures its electrical conductivity; After promptly this en plaque carbon nano-tube ingot is inhaled hydrogen and recorded its hydrogen storage content, measure its electrical conductivity down with step 2 the same terms;
Step 4, repeating step 1～3 is measured and is adsorbed with the different different electrical conductivitys of measuring the en plaque carbon nano-tube ingot of hydrogen; Be repeating step 1～3, adjust the quantity of carbon nano-tube, make the amounts of hydrogen difference that charges into each time, measure the different electrical conductivitys of the en plaque carbon nano-tube ingot that is adsorbed with different amount hydrogen;
Step 5, the drawing standard curve; Promptly draw the canonical plotting of electrical conductivity-hydrogen Storage in Carbon Nanotubes amount according to step 2～4 gained data;
Step 6 is measured the electrical conductivity of the carbon nano-tube of unknown hydrogen content, finds its hydrogen content from the typical curve that step 5 is drawn; The cold en plaque ingot that all is pressed under the carbon nano-tube that is about to a unknown hydrogen content and step 1 the same terms, again with step 2 the same terms its electrical conductivity of measurement down, the canonical plotting of drawing from step 5 finds out the hydrogen storage content of carbon nano-tube.
See also Fig. 2 to Fig. 4, will describe each step of the present invention in detail with concrete embodiment below:
As shown in Figure 2, the step 1 of embodiment of the present invention is for providing an amount of pure carbon nano-tube 20, and with these carbon nano-tube 20 cold en plaque carbon nano-tube ingots 10 that all are pressed into.The purpose of this step is carbon nano-tube is pressed into ingot, the convenient test.Include no several carbon nano-tube 20 owing to be pressed into the carbon nano-tube ingot 10 of en plaque, every carbon nano-tube 20 is arranged toward all directions in carbon nano-tube ingot 10, so measured electrical conductivity (electrical conductivity sign) is the mean value of a carbon nanotube conducting degree in the subsequent step.Cold purpose of all pressing is to reduce the influence of heat to carbon nano-tube 20, under the situation that does not influence carbon nano-tube 20 structure and properties, as long as many carbon nano-tube 20 can be pressed into en plaque carbon nano-tube ingot 10, the operating temperature of cold pressure equalizing and pressure can be adjusted according to circumstances.
As shown in Figure 3, the step 2 of embodiment of the present invention is to measure the electrical conductivity of this en plaque carbon nano-tube ingot 10.One electrical conductivity meter 11 is connected into the loop with en plaque carbon nano-tube ingot 10, can reads the electrical conductivity of en plaque carbon nano-tube ingot 10 from electrical conductivity meter 11.
As shown in Figure 4, the step 3 of embodiment of the present invention is this en plaque carbon nano-tube ingot 10 to be placed on PCT (Pressure-composition-isotherm) measure in the instrument 12, after inhaling hydrogen and recording its hydrogen storage content, measure the electrical conductivity of the en plaque carbon nano-tube ingot 10 that is adsorbed with a certain amount of hydrogen down with step 2 the same terms.
Step 4 of the present invention is repeating steps 1～3, adjusts the quantity of carbon nano-tube, makes the amounts of hydrogen difference that at every turn charges into, and measures the different electrical conductivitys of the en plaque carbon nano-tube ingot that is adsorbed with different amount hydrogen.Repeat repeatedly as far as possible, make each time that hydrogen content increases gradually, saturated in the carbon nano-tube ingot up to hydrogen, draw hydrogen content and electrical conductivity multi-group data one to one.Because the conductive capability of carbon nano-tube own is stronger, and hydrogen is non-conductive, so after the carbon nano-tube suction hydrogen, conductive capability can descend, and its electrical conductivity will reduce thereupon, and hydrogen storage content is many more, and electrical conductivity is more little.
Step 5 of the present invention is to draw the canonical plotting of electrical conductivity-hydrogen Storage in Carbon Nanotubes amount according to the resulting data in step 2～4.With hydrogen content (mass percent) is horizontal ordinate, and the carbon nanotube conducting coefficient is an ordinate, and step 2～4 gained data are depicted in the coordinate system with point, again these points is linked to be a smooth curve with certain trend.Because this curve horizontal ordinate hydrogen content scope is zero to saturation concentration, so any hydrogen storage content to be measured is all in this curve ranges, behind the electrical conductivity of the carbon nano-tube that records hydrogen storage content to be measured, can inhale number is found this carbon nano-tube from this curve hydrogen storage content according to conduction.
Step 6 of the present invention is with the cold en plaque ingot that all is pressed under the carbon nano-tube of a unknown hydrogen content and step 1 the same terms, measures down its electrical conductivity with step 2 the same terms, and the canonical plotting of drawing from step 5 finds out the hydrogen storage content of carbon nano-tube.
The present invention has following advantage: the hydrogen storage content of measuring carbon nano-tube by the electrical conductivity of measuring carbon nano-tube, it is less demanding to measurement environment to measure electrical conductivity, easy to operate during measurement, measuring result error is little, can measure the hydrogen storage content of the carbon nano-tube of any unknown hydrogen content.
Claims (3)
1. a method of measuring the hydrogen Storage in Carbon Nanotubes amount comprises:
Step 1 provides an amount of pure carbon nano-tube, with the cold en plaque carbon nano-tube ingot that all is pressed into of this carbon nano-tube;
Step 2 is measured the electrical conductivity of this en plaque carbon nano-tube ingot;
Step 3 with this en plaque carbon nano-tube ingot suction hydrogen and after recording its hydrogen storage content, is measured its electrical conductivity down with step 2 the same terms;
Step 4, repeating step one to three, the quantity of adjustment carbon nano-tube makes the amounts of hydrogen difference that charges into each time, measures the different electrical conductivitys of the en plaque carbon nano-tube ingot that is adsorbed with different amount hydrogen;
Step 5 is according to the canonical plotting of step 2 to four gained data drafting electrical conductivity-carbon nanotube hydrogen storage content;
Step 6, with the cold en plaque carbon nano-tube ingot that all is pressed under the carbon nano-tube of a unknown hydrogen content and step 1 the same terms, measure down its electrical conductivity with step 2 the same terms again, the canonical plotting of drawing from step 5 finds out the hydrogen storage content of carbon nano-tube.
2. the method for measurement hydrogen Storage in Carbon Nanotubes amount as claimed in claim 1 is characterized in that adopting in the step 3 PCT (Pressure-composition-isotherm) to measure instrument and fills hydrogen and record its hydrogen storage content to carbon nano-tube.
3. the method for measurement hydrogen Storage in Carbon Nanotubes amount as claimed in claim 1, it is characterized in that the step 4 repeating step at one to three o'clock, each hydrogen content increases gradually, and is saturated in carbon nano-tube up to hydrogen, draws hydrogen content and electrical conductivity multi-group data one to one.
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| CN 200310112502 CN1621822A (en) | 2003-11-28 | 2003-11-28 | Method for measuring hydrogen storage capacity of carbon nanometer tube |
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| CN 200310112502 CN1621822A (en) | 2003-11-28 | 2003-11-28 | Method for measuring hydrogen storage capacity of carbon nanometer tube |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107683407A (en) * | 2015-09-18 | 2018-02-09 | 松下电器产业株式会社 | Chemical substance inspissator and chemical substance detection means |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107683407A (en) * | 2015-09-18 | 2018-02-09 | 松下电器产业株式会社 | Chemical substance inspissator and chemical substance detection means |
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