Thin film Pt/TiO2 catalysts for the polymer electrolyte fuel cell

被引：102

作者：

Gustavsson, M.

Ekstrom, H.

Hanarp, R. ^{[1
]}

Eurenius, L.

Lindbergh, G.

Olsson, E.

Kasemo, B.

机构：

[1] Chalmers, Competence Ctr Catalysis, SE-41296 Gothenburg, Sweden

[2] Chalmers, Dept Appl Phys, SE-41296 Gothenburg, Sweden

[3] Kungl Tekniska Hogskolm, Dept Chem Engn & Technol Appl Electrochem, SE-10044 Stockholm, Sweden

来源：

JOURNAL OF POWER SOURCES | 2007年 / 163卷 / 02期

关键词：

fuel cells; polymer electrolyte; oxygen reduction; electrocatalyst; Pt; TiO2;

D O I：

10.1016/j.jpowsour.2006.10.005

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Thin film Pt/TiO2 catalysts are evaluated in a polymer electrolyte electrochemical cell. Individual thin films of Pt and TiO2, and bilayers of them, were deposited directly on Nafion membranes by thermal evaporation with varying deposition order and thickness (Pt loadings of 3-6 mu g cm(-2)). Structural and chemical characterization was performed by transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). Oxygen reduction reaction (ORR) polarization plots show that the presence of a thin TiO2 layer between the platinum and the Nation increases the performance compared to a Pt film deposited directly on Nation. Based on the TEM analysis, we attribute this improvement to a better dispersion of Pt on TiO2 compared to on Nalion and in addition, substantial proton conduction through the thin Ti02 layer. It is also shown that deposition order and the film thickness affects the performance. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：671 / 678

页数：8

共 34 条

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