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A preparation method of nanoporous gold for fuel cell thin-layer electrodes

A nanoporous gold, fuel cell technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of increasing the difficulty of surface modification of nanoporous gold, the fragility of nanoporous gold films, and the limitation of nanoporous gold films, etc. The effect of improving the loading efficiency, high catalyst dispersion, and less breakage

Active Publication Date: 2018-04-24
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This MEA is applied in a direct formic acid fuel cell with a maximum power density of 100mWcm -2 , but the above-mentioned preparation process uses hydrazine as a reducing agent, which is potentially harmful to the environment and the human body.
[0008] In the above-mentioned patents, the nanoporous gold film is generally used as a self-supporting structure, and then its inner surface is modified, but the nanoporous gold film is fragile during the preparation process, which increases the difficulty of surface modification of the nanoporous gold, making the nanoporous gold film Gold thin films, a functional material, are limited in engineering applications

Method used

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  • A preparation method of nanoporous gold for fuel cell thin-layer electrodes
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  • A preparation method of nanoporous gold for fuel cell thin-layer electrodes

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Embodiment 1

[0033] Using 12K gold foil as raw material, cut the gold foil into a suitable size, spread the gold foil on the surface of deionized water, and transfer it to diluted nitric acid (the volume ratio of nitric acid and deionized water is 2:1), and control the reaction time The as-prepared nanoporous gold was labeled as NPG(30). Transfer the nanoporous gold film (NPG, nanoporous gold film) obtained after dealloying to deionized water, at this time, the nanoporous gold film spreads on the surface of deionized water; replace the deionized 3-4 times to remove the nanoporous gold film Nitric acid on the surface; transfer the nanoporous gold film to mica sheet (size 2.5cm × 4.0cm), dry at room temperature; cover the Nafion 211 membrane on the side with the nanoporous gold film, under the conditions of 150 ℃ and 5MPa Hot pressing for 3 minutes; carefully remove the mica sheet, and wash the obtained Nafion membrane with deionized water. The pore size test shows that the porosity of the ...

Embodiment 2

[0037] Using 12K gold foil as raw material, cut the gold foil into a suitable size, spread the gold foil on the surface of deionized water, and transfer it to diluted nitric acid (the volume ratio of nitric acid and deionized water is 1:1), and control the reaction time The as-prepared nanoporous gold was labeled as NPG(30). Transfer the nanoporous gold film obtained after dealloying to deionized water, and at this time, the nanoporous gold film spreads on the surface of the deionized water; replace the deionized 3-4 times to remove the nitric acid on the nanoporous gold film; The porous gold film was transferred to a mica sheet (size 2.5cm*4.0cm), and dried at room temperature; the Nafion211 film was covered on the side with the nanoporous gold film, and hot-pressed at 150°C and 6MPa for 1.5min; carefully Remove the mica sheet and wash the Nafion membrane at this point with deionized water.

[0038] Pt was deposited on nanoporous gold films by CV electrodeposition. The spec...

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Abstract

The invention provides a preparation method of nanoporous gold used in thin-layer electrodes of fuel cells. First, gold foil is used as a raw material to obtain a nanoporous gold film by a dealloying method, and then the film is transferred to one side of an ion exchange membrane. The composite thin film is used as a support layer to deposit a catalyst by electrochemical method to form a nanoporous gold thin layer electrode. The electrochemical deposition method adopted in the present invention has the advantages of being environmentally friendly, controllable catalyst loading, easy to scale up, etc., and the constructed nano-porous metal thin-layer electrode can be used in fuel cells and other batteries and electrochemical reactors.

Description

technical field [0001] The invention relates to a preparation method of nanoporous gold used for thin-layer electrodes of fuel cells, belonging to the field of fuel cells. Background technique [0002] A fuel cell is a highly efficient energy conversion device that efficiently converts chemical energy stored in chemical substances into electrical energy. At present, fuel cells have been applied in many fields such as electric vehicles, distributed power stations, and aviation. Proton exchange membrane fuel cells have attracted widespread attention due to their advantages such as high power density, fast start-up speed, high conversion efficiency, and environmental friendliness. [0003] The membrane electrode assembly (MEA) is the core component of the electrochemical reaction device, which consists of a catalytic layer and a diffusion layer located on both sides of the proton exchange membrane. Membrane electrodes are mainly divided into Gas Diffusion Electrode (GDE), Cat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/92
CPCY02E60/50
Inventor 邵志刚曾亚超俞红梅郭晓倩王志强秦晓平衣宝廉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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