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Positive electrode catalyst for direct ethanol fuel cell and preparation method for positive electrode catalyst

A technology of fuel cells and catalysts, which is applied in the direction of battery electrodes, circuits, electrical components, etc., to achieve the effects of improving catalytic activity, simple and easy preparation methods, and easy industrial application

Active Publication Date: 2017-01-04
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst improves the CO poisoning resistance of Pt to a certain extent and improves the utilization rate of Pt, but there is still some gap from the maximum utilization of Pt.

Method used

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  • Positive electrode catalyst for direct ethanol fuel cell and preparation method for positive electrode catalyst
  • Positive electrode catalyst for direct ethanol fuel cell and preparation method for positive electrode catalyst
  • Positive electrode catalyst for direct ethanol fuel cell and preparation method for positive electrode catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0021] A. Disperse 22.57g of zirconium nitrate and 200mg of graphite oxide (GO) in deionized water to prepare 100ml of suspension A, add dropwise 15ml of 10g / L sodium borohydride aqueous solution, stir for 1h, filter with suction, and use 80% ethanol solution Washed and dried to obtain pre-reduced ZrO 2 / GN powder;

[0022] B. Ultrasonic disperse 1 g of the sample obtained in step A in 100ml ethylene glycol solution to prepare suspension B, and ultrasonically disperse for 10 minutes. React suspension B at 130°C for 5 hours, filter with suction, and use 80% Washed with ethanol solution and dried to obtain ZrO 2 / GN Powder. Calcination at 550°C for 1 hour under a nitrogen atmosphere;

[0023] C. Take 1.1ml of chloroplatinic acid solution with a concentration of 3g / 100ml and 14.4mg of stannous chloride, and mix them according to the Pt:Sn molar ratio of 1:1 to prepare solution C, and mix solution C with 66ml of ethylene glycol. Use 1mol L -1 Sodium hydroxide solution in ethy...

Embodiment 2

[0027] A. Disperse 8.03mg of zirconium nitrate and 200mg of graphite oxide (GO) in deionized water to prepare 100ml of suspension A, add dropwise 25ml of 10g / L sodium borohydride aqueous solution, stir for 1.5h, filter with suction, and use 80% ethanol The solution was washed and dried to obtain pre-reduced ZrO 2 / GN powder;

[0028] B. Ultrasonic disperse 1.5g of the sample obtained in step A in 100ml ethylene glycol solution to prepare suspension B, ultrasonically disperse for 15min, react suspension B at 140°C for 4 hours, suction filter, and use 80% Washed with ethanol solution, dried to get ZrO 2 / GN Powder. Calcination at 600°C for 1 hour under nitrogen atmosphere;

[0029] C. Take 1.26ml of chloroplatinic acid solution with a concentration of 3g / 100ml and 11.0mg of stannous chloride to prepare solution C according to the Pt:Sn molar ratio of 1.5:1, and mix solution C with 75.6ml of ethylene glycol. Use 2mol L -1 Adjust pH=11 with sodium hydroxide and ethylene glyco...

Embodiment 3

[0036] A. Disperse 6.28g of zirconium nitrate and 200mg of graphite oxide (GO) in deionized water to prepare suspension A, add dropwise 30ml of 10g / L sodium borohydride aqueous solution, stir for 2h, filter with suction, and wash with 80% ethanol solution , dried to obtain pre-reduced ZrO 2 / GN powder;

[0037] B. Ultrasonic disperse 2g of the sample prepared in step A in 100ml ethylene glycol solution to prepare suspension B, and ultrasonically disperse for 20min, react suspension B at 160°C for 3 hours, filter with suction, and use 80% Washed with ethanol solution and dried to obtain ZrO 2 / GN Powder. Calcination at 650°C for 1 hour under nitrogen atmosphere;

[0038] C. Take 1.36ml of chloroplatinic acid solution with a concentration of 3g / 100ml and 8.9mg of stannous chloride to prepare solution C according to the Pt:Sn molar ratio of 2:1, and mix solution C with 81.6ml of ethylene glycol. Use 3mol L -1 Adjust pH=12 with sodium hydroxide and ethylene glycol solution; r...

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Abstract

The invention provides a positive electrode catalyst for a direct ethanol fuel cell and a preparation method for the positive electrode catalyst. The positive electrode catalyst is expressed as PtSn-ZrO<2> / GN, wherein the catalyst takes graphene (GN) as a carrier, and takes ZrO<2>-doped and partially-alloyed PtSn as an active component; the ZrO<2> is uniformly doped in the PtSn / GN; the PtSn-ZrO<2> / GN is used as the positive electrode catalyst for the direct ethanol fuel cell, the ethanol oxidization initial potential of the catalyst is lower than that of a corresponding unitary and binary catalyst, and the initial potential value is 0.14V; the stability is improved by 1-2 times compared with that of the Pt / GN; and the peak current density for catalyzing ethanol oxidization can reach 9-11mA.cm<-2>. The preparation method adopted by the invention is simple and easy to implement, so that industrial application can be realized easily; and according to the prepared PtSn-ZrO<2> / GN composite catalyst, the loading capacity of platinum is lowered, so that the cost of the catalyst is dramatically lowered.

Description

technical field [0001] The invention relates to an anode catalyst for catalyzing ethanol oxidation and its preparation, in particular to a PtSn-ZrO 2 / GN catalyst and its preparation method, and the catalyst is used as a direct ethanol fuel cell anode catalyst. Background technique [0002] Direct ethanol fuel cell (DEFC) has the advantages of high energy density, low toxicity, easy storage and transportation, and has broad application prospects in electric vehicles and mobile portable devices. At present, electrocatalysts still use platinum as the main component and are considered to be the best catalysts for fuel cells. However, the high cost of platinum-based electrocatalysts limits the wide application of fuel cells. Therefore, the development of catalysts with low platinum loading and high performance is the key technology to promote the development of fuel cells. Recent studies have found that when other metal elements such as Ni, Sn, Pd, Co, Cu and other metals are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92H01M4/88
CPCH01M4/8825H01M4/921Y02E60/50
Inventor 于苏平姜倩朱红韩克飞汪中明
Owner BEIJING UNIV OF CHEM TECH
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