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Fuel cell catalyst and preparation method thereof

A fuel cell and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, battery electrodes, etc., can solve the problems of slow reaction kinetics, high price, low reaction rate, etc., to promote redox reactions and reduce prices Low cost and high oxygen storage capacity

Active Publication Date: 2013-05-01
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the low reaction rate limits the application of DMFC
At present, Pt is the best active component to catalyze the reaction between the anode and the cathode, but Pt is expensive and is easily poisoned by intermediate products of methanol oxidation (such as CO) at the anode and loses its catalytic activity, and the reaction kinetics at the cathode is still slow.

Method used

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  • Fuel cell catalyst and preparation method thereof
  • Fuel cell catalyst and preparation method thereof
  • Fuel cell catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] A. Weigh 2g graphite powder, add 46ml concentrated H 2 SO 4 , 0.5g NaNO 3 and 6g KMnO 4 , Control the reaction temperature below 10°C and stir the reaction for 1h. The three-neck flask was moved to a 35°C water bath for 0.5h reaction, and 92ml of deionized water was slowly added dropwise. Rapidly raise the temperature to 95°C for 0.5h, add 20ml of 30% H 2 o 2 Stop responding. The product was neutralized by washing with 5% hydrochloric acid solution and deionized water, and dried at 80°C to obtain graphite oxide.

[0025] B. Take 90mg of graphite oxide and 25.2mg of cerium nitrate and ultrasonically disperse them in 100ml of ultrapure water, ultrasonicate for 30min, move the three-necked bottle into an oil bath, raise the temperature to 80°C, and use 0.1mol L -1 Adjust the pH of the solution with ammonia water to 8, reflux at a constant temperature for 4 hours, pour the solution into the reaction kettle while it is hot, and react at 120°C for 4 hours. The product...

Embodiment 2

[0029] A. step is the same as embodiment 1

[0030] B. Take 95mg of graphite oxide and 12.6mg of cerium nitrate and ultrasonically disperse them in 100ml of ultrapure water, ultrasonically for 1h, move the three-necked bottle into an oil bath, raise the temperature to 120°C, adjust the pH of the solution to 11 with ammonia water, and reflux at constant temperature for 6h , Pour the solution into the reaction kettle while it is hot, and react at 160°C for 6h. The product was suction filtered, washed, and dried under vacuum at 50°C to obtain CeO 2 / GN.

[0031] C. Weigh 44.8mg CeO 2 / GN into the three-necked bottle, add 40ml of ethylene glycol and 30mg of chloroplatinic acid, ultrasonically disperse for 2 hours, move the three-necked bottle into an oil bath at 120°C, and adjust the pH to 11 with ethylene glycol solution with a concentration of 5% sodium hydroxide, Stir and reflux for 6 hours, filter and wash to obtain Pt-CeO 2 / GN Catalyst

Embodiment 3

[0033] A, B step are the same as embodiment 1

[0034] C. Weigh 44.8mg CeO 2 / GN into a three-neck bottle, add 50ml ethylene glycol and 30mg chloroplatinic acid, ultrasonically disperse for 2 hours, move the three-necked bottle into a 90°C oil bath, adjust the pH to 10 with 5% potassium hydroxide ethylene glycol solution, Stirred and refluxed for 6h, filtered and washed to obtain Pt-CeO 2 / GN Catalyst.

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Abstract

The invention discloses a fuel cell catalyst and a preparation method thereof. The fuel cell catalyst Pt-CeO2 / GN takes graphene as a carrier, and Pt-CeO2 is taken as the catalyst of active components, wherein composite nano particles of Pt and CeO2 are uniformly distributed on the surface of the graphene, and the particle size of the Pt is 3-5 nm; the catalytic activity of the fuel cell catalyst is improved by 20-35 percent, compared with the catalytic activity of Pt / GN catalyst; and the electrochemical activity area of the fuel cell catalyst reaches 59.1-66.4 m<2> / g<-1>, and the density of current for catalyzing methanol oxide reaches 279.5-440.1 mA / g<-1>Pt. The preparation method comprises the following steps: graphite oxide and cerium nitrate are dispersed in water, ammonia is used to regulate the pH value, and CeO2 / GN is obtained via reaction; and prepared CeO2 / GN is dispersed in ethylene glycol solution in an ultraphonic manner, chloroplatinic acid solution is added, the pH value is regulated, and Pt-CeO2 / GN catalyst is obtained via reaction. The preparation method disclosed by the invention is simple, can prepare catalysts provided with higher catalytic activity and stability, and has a broad application prospect in the filed of fuel cells.

Description

technical field [0001] The invention relates to a fuel cell catalyst and its preparation, in particular to Pt-CeO 2 / GN catalyst and preparation method thereof. Background technique [0002] Direct methanol fuel cell (DMFC), as a green energy source with clean, high efficiency and mild operating conditions, is one of the main ways to solve environmental pollution and energy crisis. However, the low reaction rate limits the application of DMFCs. At present, Pt is the best active component to catalyze the reaction between the anode and the cathode, but Pt is expensive and is easily poisoned by intermediate products of methanol oxidation (such as CO) at the anode and loses its catalytic activity, and the reaction kinetics at the cathode is still slow. . 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 shown that combining Pt with transition metals (such ...

Claims

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Application Information

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IPC IPC(8): H01M4/90B01J23/63
CPCY02E60/50
Inventor 于书平刘秋波朱红韩克飞汪中明
Owner BEIJING UNIV OF CHEM TECH
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