Approach to High Performance Electrode Catalysts for DMFC

DMFC 高性能电极催化剂的研究方法

基本信息

批准号：
13134203
负责人：
TATSUMI Takashi
金额：
$ 47.1万
依托单位：
Tokyo Institute of Technology (2005)Yokohama National University (2001-2004)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research on Priority Areas
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2005
项目状态：
已结题

项目摘要

The mesoporous carbons were synthesized by using mesoporous silica materials such as MCM-48 and SBA-15 as a template, respectively. Typically, the templates were impregnated with sucrose as a carbon source and sulfuric acid as an acid catalyst. Following dehydration-condensation of the carbon source, the carbonization was carried out mainly at 900℃ under flowing argon. The silica was removed from the silica-carbon composite by treating it with hydrofluoric acid, producing mesoprpus carbons CMK-1, CMK-3, and CMK-5. Another type of carbon has been also synthesized by using petroleum pitch. MCF carbons can be synthesized by using MCF silica as a template. A carbon structure composed of spherical hollows with closed walls with mesopores of around 4 nm in diameter is prepared by the two-step impregnation of sucrose followed by carbonization. The mesoporous structure was maintained up to 1400℃. Platinum is loaded on these mesoporous carbons. TEM observations revealed the presence of metal particles of below 2 nm in the mesoporous material treated at 1100℃. The metal dispersion is highly dependent not only on the carbon structures but also on the temperature for thermal treatments in inert gas atmosphere. The latter is interpreted in terms of the change in the surface functional groups and their density, which probably affect the interaction of the surface and Pt sources. Oxygen reduction activity of the Pt-loaded electrode on CMK-1 was higher than that of the acetylene derived carbon. The performance of Pt catalyst was affected not only by the Pt dispersion but also by their distribution in the carbon electrode.

通过使用介孔二氧化硅材料（例如MCM-48和SBA-15）作为模板合成中孔碳。通常，将模板用蔗糖作为碳源和硫酸作为酸催化剂浸渍。碳源脱水降低后，在流动的氩气下，碳化主要在900℃进行。通过用氢氟酸处理二氧化硅复合材料，从而从二氧化硅碳复合材料中取出，从而产生梅曲子碳CMK-1，CMK-3和CMK-5。还使用石油螺距还合成了另一种类型的碳。可以通过使用MCF二氧化硅作为模板来合成MCF碳。由球形空洞组成的碳结构，其直径约为4 nm的封闭壁组成，由蔗糖的两步浸没，然后碳化。介孔结构保持到1400℃。铂金在这些介孔碳上。 TEM观察结果表明，在1100℃处理的介孔材料中存在低于2 nm的金属颗粒。金属色散不仅高于碳结构，而且还取决于惰性气气中热处理的温度。后者用表面官能团的变化及其密度来解释，这可能会影响表面和PT源的相互作用。 CMK-1上负载电极的氧还原活性高于乙炔衍生的碳的氧气活性。 PT催化剂的性能不仅受PT分散剂的影响，而且还受到碳电极中的分布的影响。