Core-shell gold@ cobalt-boron catalyst for fuel cell

A technology of fuel cells and catalysts, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of cumbersome steps and complicated operation methods, and achieve the effects of simple preparation methods, superior catalytic performance, and good dispersibility

Inactive Publication Date: 2016-06-22
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method can effectively reduce the use of precious metals and greatly reduce the c

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  • Core-shell gold@ cobalt-boron catalyst for fuel cell
  • Core-shell gold@ cobalt-boron catalyst for fuel cell
  • Core-shell gold@ cobalt-boron catalyst for fuel cell

Examples

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Embodiment 1

[0028] The catalyst of this embodiment is a gold-cobalt-boron alloy with a core-shell structure, wherein amorphous cobalt-boron is the shell, and crystalline gold is the core. The preparation method of the catalyst is as follows:

[0029] Step 1. Dissolve 0.01mol cobalt dichloride hexahydrate and 0.001mol chloroauric acid tetrahydrate in deionized water to prepare a 100mL mixed solution; the total concentration of cobalt ions and gold ions in the mixed solution is 0.11mol / L ;

[0030] Step 2, dissolving 0.033mol potassium borohydride in deionized water to prepare a potassium borohydride solution with a concentration of 0.1mol / L, then adding potassium hydroxide to the potassium borohydride solution until the pH of the solution is 11 to obtain boron Potassium hydride-potassium hydroxide mixed solution;

[0031] Step 3: Add the borohydride-hydroxide mixed solution described in Step 2 to the mixed solution described in Step 1 at a rate of 1 mL / min under stirring conditions at a t...

Embodiment 2

[0040] The catalyst of this embodiment is a gold-cobalt-boron alloy with a core-shell structure, wherein amorphous cobalt-boron is the shell, and crystalline gold is the core. The preparation method of the catalyst is as follows:

[0041] Step 1, 0.1mol cobalt dichloride hexahydrate and 0.001mol chloroauric acid tetrahydrate are dissolved in deionized water, and the total concentration of cobalt ion and gold ion is prepared as a mixed solution of 0.1mol / L;

[0042] Step 2, dissolving 0.505mol potassium borohydride in deionized water to prepare a potassium borohydride solution with a concentration of 0.5mol / L, then adding potassium hydroxide to the potassium borohydride solution until the pH of the solution is 12 to obtain boron Potassium hydride-potassium hydroxide mixed solution;

[0043] Step 3: Add the borohydride-hydroxide mixed solution described in Step 2 to the mixed solution described in Step 1 at a rate of 2 mL / min under stirring conditions at a temperature of 10°C, a...

Embodiment 3

[0047] The catalyst of this embodiment is a gold-cobalt-boron alloy with a core-shell structure, wherein amorphous cobalt-boron is the shell, and crystalline gold is the core. The preparation method of the catalyst is as follows:

[0048] Step 1, 0.1mol cobalt dichloride hexahydrate and 0.05mol chloroauric acid tetrahydrate are dissolved in deionized water to prepare a mixed solution whose total concentration of cobalt ion and gold ion is 1mol / L;

[0049] Step 2, dissolving 0.75mol potassium borohydride in deionized water to prepare a potassium borohydride solution with a concentration of 1mol / L, then adding potassium hydroxide to the potassium borohydride solution until the pH value of the solution is 11.5, to obtain borohydride Potassium-potassium hydroxide mixed solution;

[0050] Step 3. Add the borohydride-hydroxide mixed solution described in step 2 to the mixed solution described in step 1 at a rate of 1 mL / min under stirring conditions at a temperature of 15°C, and wai...

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Abstract

The invention discloses a core-shell gold@ cobalt-boron catalyst for a fuel cell. The catalyst is gold-cobalt-boron alloy with a core-shell structure, wherein amorphous-state cobalt-boron is a shell, and crystalline-state gold is a core. The core-shell catalyst disclosed by the invention is an amorphous-state material coated crystalline-state material and is different from a traditional crystal coated crystal structure, the structure is compatible with joint characteristics of an amorphous-state material and a crystalline-state material and has excellent catalytic performance, the discharge performance of the fuel cell can be effectively improved, the usage amount of noble metal is substantially reduced, the cost of the fuel cell is remarkably reduced, and the development of the fuel cell is promoted. The catalyst disclosed by the invention is prepared according to a one-step reduction method, the preparation method is simple and is easy to operate, and the prepared catalyst is uniform in grain size and high in dispersibility.

Description

technical field [0001] The invention belongs to the technical field of catalysts for fuel cells, and in particular relates to a core-shell type gold-cobalt-boron catalyst for fuel cells. Background technique [0002] A fuel cell is an electrochemical device that directly converts chemical energy into electrical energy without going through the Carnot cycle. At present, fuel cell technology has been considerably developed, for example: proton exchange membrane fuel cell (PEMFC). However, most fuel cell catalysts use noble metals, especially noble metal Pt, as catalysts. Due to the limited content and high price of noble metals, the extensive development of fuel cells is limited. At present, binary or multi-element alloy catalysts have been studied to a certain extent, and the cost has been reduced to a certain extent, but there is still a long way to go for wide application, and the catalytic performance still needs to be improved. In recent years, core-shell nanoparticles ...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/92H01M4/88B82Y30/00B82Y40/00
CPCH01M4/8825H01M4/9041H01M4/9091H01M4/921H01M4/923H01M4/928B82Y30/00B82Y40/00Y02E60/50
Inventor 李赛
Owner XIAN UNIV OF SCI & TECH
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