Anodic electrocatalyst for direct borohydride fuel cell and preparation method thereof

A borohydride, fuel cell technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, battery electrodes, etc., can solve the problem of increasing catalyst costs, low electrocatalytic activity, and complex preparation processes and other problems, to achieve the effect of good industrial application prospects, high catalytic surface area, and simple preparation process

Inactive Publication Date: 2009-07-22
NO 63971 TROOPS PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] According to previous studies, the Au anode electrocatalyst used in direct borohydride fuel cells has the problems of complex preparation process, large gold particle size, low electrocatalytic activity, and the addition of Pt and Pd noble metals to increase the cost of the catalyst.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0028](1) Preparation of gold sol: take 8.12ml of 0.1M chloroauric acid aqueous solution, add 1525.1ml of twice distilled water, magnetically stir, add 16.8ml of aqueous solution of 1wt% polyvinyl alcohol PVA17 / 88, stir for 20min to make it mix evenly, 50 ml of freshly prepared 0.32 wt % sodium borohydride aqueous solution was added dropwise at room temperature under magnetic stirring, and stirring was continued for 30 min after the addition was completed to form a stable wine-red gold sol. The average diameter of gold particles observed by TEM is 3.0 nm.

[0029] (2) Purification and surface oxidation treatment of carbon nanotubes: the average diameter of carbon nanotubes is 10 nm, and the carbon nanotubes are first treated with 37% concentrated hydrochloric acid solution, heated and refluxed in an oil bath at 120° C. for 6 hours. Filter wash without Cl - Then add 65% concentrated nitric acid and 98% concentrated sulfuric acid solution at a volume ratio of 2:1, heat and refl...

example 2

[0033] (1) Preparation of gold sol: Weigh 8.12ml of 0.1M chloroauric acid aqueous solution, add 725.1ml of double distilled water, stir magnetically, add 16.8ml of 1wt%% polyvinyl alcohol PVA17 / 88 aqueous solution, stir for 20min to make it mix evenly , add dropwise 50ml of freshly prepared 0.32wt% sodium borohydride aqueous solution at room temperature under magnetic stirring, and continue stirring for 30min after the dropwise addition to form a stable wine-red gold sol. The average diameter of gold particles observed by TEM is 5.4nm.

[0034] (2) Purification and surface oxidation treatment of carbon nanotubes: the carbon nanotubes were first treated with 37% concentrated hydrochloric acid solution, heated and refluxed in an oil bath at 120° C. for 6 hours. Filter wash without Cl - Then add 68% concentrated nitric acid and heat to reflux in an oil bath at 120°C for 6 hours, filter and wash until the filtrate is neutral, dry it under vacuum at 110°C for later use.

[0035] ...

example 3

[0038] The preparation of gold sol is identical with the step (1) of embodiment 1, and the processing of conductive carbon black Vxc-72R is identical with the purification and surface oxidation treatment of embodiment 2 step (2) carbon nanotubes, and the preparation of anode electrocatalyst is the same as embodiment In step (3) in 1, the loading amount of gold is 5%.

[0039] Using the obtained electrocatalyst as the anode electrocatalyst, the single cell performance of the direct sodium borohydride-air fuel cell at room temperature and normal pressure shows an open circuit voltage of 0.98V and a maximum power density of 14.5mW / cm 2 .

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Abstract

The invention relates to an anode electrocatalyst for a direct borohydride fuel cell and a method for preparing the same, in particular to a method for preparing a porous carbon loading nanometer gold catalyst. The preparation method comprises that: by adopting the metal sol loading method, the surface of the porous carbon carrier after purification and surface oxidizing treatment is loaded with a nanometer gold particle, and the size of the gold particle can be controlled by controlling the adding amount of a reducing agent and the gold concentration in the metal sol. The loading capacity of the gold is 5 to 30 percent, and the particle size of the gold is 2 to 6nm. The porous carbon is one of or a mixture of more than one of carbon nanometer pipe, carbon nanometer fiber, active carbon fiber, graphitized carbon black, active carbon and intermediate phase carbon microsphere, and the specific surface area of the carrier is between 100 and 2,000m / g. The method has the advantages of simple preparation process, unnecessary high-temperature calcination, and easy mass production. The prepared gold particle has the advantages of high-degree dispersion on the surface of the carbon carrier and even size distribution. When used as the anode electrocatalyst of the direct borohydride fuel cell, the anode electrocatalyst has good BH4 electric oxidation catalysis activity.

Description

technical field [0001] The invention belongs to the technical field of electrocatalyst and energy, and relates to a porous carbon-loaded nano-gold electrocatalyst for the anode of a direct borohydride fuel cell and a preparation method thereof. Background technique [0002] Due to the technical difficulties of proton exchange membrane fuel cells using hydrogen as fuel - the storage and transportation technology of hydrogen has not been well resolved so far, people have been trying to develop direct hydrogen-rich compounds fueled by electrochemically active liquid or solution liquid fuel cell. Directly input methanol instead of hydrogen into the fuel cell for power generation - the direct methanol fuel cell has been extensively studied for many years. Although it requires several times more platinum catalyst than the hydrogen-oxygen (empty) fuel cell, the electricity generated by the electrode per unit area is The power is still only a fraction of that of a hydrogen-oxygen f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52H01M4/90
Inventor 杨子芹赵鹏程谢自立丁松涛陈友生
Owner NO 63971 TROOPS PLA
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