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Preparation method of carbon surface modified hydrogen storage alloy and method for improving anode catalytic performance of direct borohydride fuel cell

A hydrogen storage alloy and surface modification technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of low catalytic activity of hydrogen storage alloys and reduced utilization of NaBH4

Inactive Publication Date: 2013-06-12
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, the catalytic activity of hydrogen storage alloys is small, which is significantly lower than that of noble metals; and because (3) can release hydrogen, reducing the amount of NaBH 4 Utilization of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Carbon nanotubes are used to modify the hydrogen storage alloy, and the ratio of carbon nanotubes to hydrogen storage alloy is 2:98. With carbon rod as counter electrode, Ag / AgCl as reference electrode, carbon nanotube modified hydrogen storage alloy as working electrode, in 2M NaOH and 0.10M NaBH 4 In the solution, under the voltage of -0.7V vs.Ag / AgCl, the chronocurrent density reaches 35mA / cm 2 , and NaBH 4 Hydrolysis does not occur.

Embodiment 2

[0037] Activated carbon is used to modify the hydrogen storage alloy, and the ratio of activated carbon to hydrogen storage alloy is 2:98. With carbon rod as counter electrode, Ag / AgCl as reference electrode, activated carbon tube modified hydrogen storage alloy as working electrode, in 2M NaOH and 0.10M NaBH 4 In the solution, under the voltage of -0.7V vs.Ag / AgCl, the chronocurrent density reaches 32mA / cm 2 , and NaBH 4 Hydrolysis does not occur.

Embodiment 3

[0039] Carbon black is used to modify the hydrogen storage alloy, and the ratio of carbon black to hydrogen storage alloy is 2:98. With carbon rod as counter electrode, Ag / AgCl as reference electrode, carbon nanotube modified hydrogen storage alloy as working electrode, in 2M NaOH and 0.10M NaBH 4 In the solution, under the voltage of -0.7V vs.Ag / AgCl, the chronocurrent density reaches 30mA / cm 2 , and NaBH 4 Hydrolysis does not occur.

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Abstract

The invention provides a preparation method of a carbon surface modified hydrogen storage alloy and a method for improving the anode catalytic performance of a direct borohydride fuel cell. The preparation method includes: mixing hydrogen storage alloy powder and carbon evenly, then placing the mixture into a ball milling tank, conducting ball milling for 1-2h at a speed of 3000-5000rpm under the protection of nitrogen, then taking the mixture out, gradually adding a 60wt.% polytetrafluoroethylene solution and a 1.5wt.% sodium carboxymethylcellulose colloid that are in a mass ratio of 1:1, keeping the mass ratio of the hydrogen storage alloy powder and the carbon quality to the polytetrafluoroethylene solution and the sodium carboxymethyl cellulose at 9-10:1, and stirring them uniformly to prepare a slurry containing the hydrogen storage alloy and carbon, coating foamed nickel with the slurry, and carrying out drying for 2.5h at 70DEG C, thus obtaining the carbon surface modified hydrogen storage alloy, which can be used for improving the anode catalytic performance of a direct borohydride fuel cell.

Description

technical field [0001] The invention relates to a method for preparing a hydrogen storage alloy, and also relates to a method for improving the catalytic performance of the anode of a direct borohydride fuel cell by modifying the hydrogen storage alloy with carbon surface. Background technique [0002] Direct borohydride fuel cell (DBFC) is a fuel cell with borohydride as the anode, NaBH 4 It is a hydrogen storage material with a high hydrogen content (11wt.%). In theory, NaBH 4 The direct electrooxidation can be 8e - Reaction, see formula (1): [0003] BH 4 - +8OH-→BO 2 - +4H 2 O+8e - (1) [0004] DBFC has high energy density (9300Wh / kg specific energy), specific capacity (5668Ah / kg) and battery voltage (the cathode is O 2 at 1.64V); NaBH 4 Non-flammable, low toxicity (not harmful unless swallowed), does not generate CO 2 , theoretically NaBH 4 Non-platinum catalysts can be used; NaBH 4 The solution can act as a heat exchange medium to cool the battery wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90
CPCY02E60/50
Inventor 王贵领张栋铭程魁曹殿学闫鹏
Owner HARBIN ENG UNIV
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