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Method for preparing metal oxide-carbon composite materials

A carbon composite material and oxide technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problem of oxide particle size growth and complex preparation process, etc. problem, to achieve the effect of uniform distribution, simple and easy method, high activity and stability

Inactive Publication Date: 2010-04-21
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the catalyst obtained by this method, the oxide particles are relatively uniform, but the preparation process is relatively complicated and other ions are introduced; at the same time, high-temperature roasting is required to increase the MO x crystallinity, which will cause the growth of oxide particle size

Method used

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  • Method for preparing metal oxide-carbon composite materials
  • Method for preparing metal oxide-carbon composite materials
  • Method for preparing metal oxide-carbon composite materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 Preparation of WO by Microwave Pyrolysis 3 / C composite material

[0023] making process:

[0024] According to WO 3 The mass content is 5% to 50%. Weigh quantitative ammonium tungstate and conductive carbon black XC-72, add ethanol as a wetting agent, mechanically grind for 1 hour, and dry at 60°C. Put the dried material into a microwave oven, microwave at high heat for 10s, pause for 20s, repeat 3 times, wash, and dry to obtain different proportions of WO 3 / C Composite. WO in the composite material obtained by this experimental method 3 The particle size is about 10nm, and the distribution is uniform.

[0025] to MO x / C composite material as a carrier, using ethylene glycol microwave-assisted method to load Pt, filtering, washing, drying, and calcination at 200-400°C for 2-5 hours in an inert atmosphere to obtain Pt / MO with different platinum-tungsten ratios x -C catalyst, wherein the mass content of Pt is 5%-50%. The above catalyst is used for the...

Embodiment 2

[0026] Example 2 The difference between this embodiment and specific embodiment 1 is that ammonium molybdate is used instead of ammonium tungstate and mixed with conductive carbon black XC-72 to obtain MoO with different mass contents 3 / C composite material, other steps are identical with specific embodiment 1.

Embodiment 3

[0027] Example 3 The difference between this embodiment and Embodiment 1 is that cerium ammonium nitrate is used instead of tungstate and mixed with XC-72 to obtain different mass contents of CeO 2 / C composite material, other steps are identical with embodiment 1.

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Abstract

The invention provides a method for preparing a metal oxide-carbon composite materials, which comprises the following steps: adding a wetting agent ethanol to tungstate or molybdate or cerium ammonirm nitrate and conductive carbon black, grinding for 0.5 to 2 hours, and drying at 60DEG C for 8 to 12h; evenly mixing the dried solid, and intermittently heating in a microwave oven, wherein the heating time is 5 to 20s, the intermittent time is 10 to 30s, and the heating is repeated for 3 to 10 times; and washing and drying the heated mixture to obtain the MOx / C composite materials with different ratios, wherein the M is tungsten, molybdenum or cerium, and the mass content of the MOx is 5 to 50 percent. The metal oxide-carbon composite materials are prepared by a microwave-thermal decomposition process, the method is simple and convenient, the oxide has small grain diameter (about 10nm), and grains are distributed evenly. After the series composite materials serve as carriers to load noble metals, the noble metal loading capacity is reduced, the dispersity of the noble metals is improved, and a catalyst has more Pt and MOx contact interfaces and stronger interaction, and shows high activity and stability in methanol or ethanol electrocatalytic oxidation.

Description

Technical field: [0001] The invention relates to a method for preparing a metal oxide-carbon composite material. Background technique: [0002] A direct alcohol fuel cell is a power generation device that uses alcohol solution or steam as the anode raw material, and air or oxygen as the oxidant. DAFC has the characteristics of strong portability, abundant fuel sources, high volumetric energy density, and environmental friendliness. In DAFC systems, the development of electrocatalyst materials is one of the key technologies to improve the output efficiency and life of batteries. The anodic oxidation of alcohols is a self-poisoning process, and the anodic oxidation rate is slow and the polarization phenomenon is serious. Therefore, the development of anode materials with high catalytic activity and stability is of great significance to improve the performance of DAFCs. [0003] At present, the anode catalysts of DAFC mainly include the following categories: [0004] Platin...

Claims

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Application Information

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IPC IPC(8): H01M4/88B82B3/00H01M4/90B01J23/652B01J23/63B01J37/34
CPCY02E60/50
Inventor 刘建国叶季蕾顾军邹志刚于涛
Owner NANJING UNIV
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