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Method for modifying direct methanol fuel cell anode catalyst

A methanol fuel cell and catalyst technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as low performance, and achieve the effects of improving catalytic activity, high catalytic activity, and reducing internal resistance

Inactive Publication Date: 2015-04-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the main reasons why the performance of DMFC is lower than that of hydrogen fuel cells is that CO, the intermediate product of electrochemical oxidation of methanol, is adsorbed on the active site of platinum, making it difficult to be further oxidized.

Method used

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  • Method for modifying direct methanol fuel cell anode catalyst
  • Method for modifying direct methanol fuel cell anode catalyst
  • Method for modifying direct methanol fuel cell anode catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: Preparation of tungsten oxide modified sulfur-containing macroporous carbon

[0037] Take glucose, thiourea and ammonium tungstate and add them into deionized water, and mix well to form a solution; wherein, the molar ratio of glucose to thiourea is 1:1, the molar ratio of thiourea to water is 1:100, thiourea and tungsten The mol ratio of ammonium acid is 1: 0.5;

[0038] Polymerize the solution at 90°C for 30 minutes to form a thiourea-glucose resin, add hydrophilic nano-calcium carbonate, and form a uniform suspension after stirring; wherein the mass ratio of thiourea-glucose resin to calcium carbonate is 1:1; After the turbid liquid was spray-dried, in flowing N 2 Put it in a tube furnace under protection, and heat it at 200°C, 650°C and 1000°C for 2 hours respectively to obtain sulfur-containing macroporous carbon modified with tungsten oxide;

Embodiment 2

[0039] Example 2: Preparation of tungsten carbide modified sulfur-containing macroporous carbon

[0040] Add sucrose, thiourea and ammonium tungstate to deionized water, and mix well to form a solution; wherein, the molar ratio of sucrose and thiourea is 1:1, the molar ratio of thiourea and water is 1:100, and the molar ratio of thiourea and tungsten The mol ratio of ammonium acid is 1: 0.3;

[0041] Polymerize the solution at 90°C for 30 minutes to form thiourea-sucrose resin, add hydrophilic nano-calcium carbonate, and form a uniform suspension after stirring; wherein the mass ratio of thiourea-sucrose resin to calcium carbonate is 1:1; After the turbid liquid was spray-dried, in flowing N 2 Put it in a tube furnace under protection, and heat it at 200°C, 650°C and 2000°C for 2 hours respectively to obtain tungsten carbide-modified sulfur-containing macroporous carbon.

Embodiment 3

[0042] Example 3: Preparation of tungsten oxide-modified sulfur-containing macroporous carbon-supported platinum catalyst

[0043] Add water-soluble starch, thiourea and ammonium tungstate to deionized water, and mix well to form a solution; wherein, the molar ratio of water-soluble starch to thiourea is 1:1, the molar ratio of thiourea to water is 1:100, and the molar ratio of sulfur to water is 1:100. The molar ratio of urea and ammonium tungstate is 1:0.2;

[0044] Polymerize the solution at 90°C for 30 minutes to form thiourea-starch resin, add hydrophilic nano-calcium carbonate, and form a uniform suspension after stirring; wherein the mass ratio of thiourea-starch resin and calcium carbonate is 1:1; After the turbid liquid was spray-dried, in flowing N 2 Put it in a tube furnace under protection, and heat it at 200°C, 650°C and 1000°C for 2 hours respectively to obtain sulfur-containing macroporous carbon modified with tungsten oxide;

[0045] Add chloroplatinic acid (...

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Abstract

The invention relates to the field of preparation of direct methanol fuel cells and aims at providing a method for modifying a direct methanol fuel cell anode catalyst. The method comprises the following steps: adding tungsten oxide modified sulfur-containing macroporous carbon or tungsten carbide modified sulfur-containing macroporous carbon into a chloroplatinic acid solution, uniformly stirring, thereby forming turbid liquid; and performing spray drying on the turbid liquid, calcining in a nitrogen atmosphere, cooling the product, thereby obtaining the direct methanol fuel cell anode catalyst. By utilizing the special affinity of sulfur in the sulfur-containing macroporous carbon on Pt, dispersed distribution of platinum in the platinum loading process can be intensified, and the catalytic activity of the catalyst is improved. By utilizing high conductivity and huge specific surface area of the macroporous carbon, the capacity of loading the catalytic center in unit area of the catalyst carrier is improved, and high catalytic activity is obtained; and moreover, the tungsten oxides and carbides are taken as auxiliary catalysts, the effect of ruthenium in the traditional platinum-ruthenium catalyst is achieved, and the effect of dissociating CO adsorbed to platinum is intensified.

Description

technical field [0001] The invention relates to the field of direct methanol fuel cell preparation, in particular to a method for preparing platinum supported on sulfur-containing macroporous carbon modified by tungsten oxide or tungsten carbide. Background technique [0002] Direct Methanol Fuel Cell belongs to Proton Exchange Membrane Fuel Cell (PEMFC), which directly uses methanol aqueous solution or steam methanol as the source of fuel supply, without the need to produce hydrogen through reforming for power generation. Compared with hydrogen-oxygen proton exchange membrane fuel cells, direct methanol fuel cells (DMFC) have the characteristics of low-temperature rapid start-up, clean and environmentally friendly fuel, and simple battery structure. This makes DMFC may be widely used in future portable electronic products. For DMFC, the fuel does not have the problem of storage and transportation difficulties, but the reaction activity is low and the catalyst is easily poi...

Claims

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Application Information

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IPC IPC(8): H01M4/92
CPCH01M4/88H01M4/8817H01M4/8896H01M4/923Y02E60/50
Inventor 刘宾虹李洲鹏
Owner ZHEJIANG UNIV
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