期刊
JOURNAL OF NANOPARTICLE RESEARCH
卷 14, 期 9, 页码 -出版社
SPRINGER
DOI: 10.1007/s11051-012-1080-5
关键词
Fuel cells; Particle size; Inter-particle distance; Supported catalysts; Catalytic activity
资金
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [Proc: 2010/20045-0]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [Proc. 131469/2011-8, 160503/2011-6]
The effect of the relationship between particle size (d), inter-particle distance (x(i)), and metal loading (y) of carbon supported fuel cell Pt or PtRu catalysts on their catalytic activity, based on the optimum d (2.5-3 nm) and x(i)/d (>5) values, was evaluated. It was found that for y < 30 wt%, the optimum values of both d and x(i)/d can be always obtained. For y >= 30 wt%, instead, the positive effect of a thinner catalyst layer of the fuel cell electrode than that using catalysts with y < 30 wt% is concomitant to a decrease of the effective catalyst surface area due to an increase of d and/or a decrease of x(i)/d compared to their optimum values, with in turns gives rise to a decrease in the catalytic activity. The effect of the x(i)/d ratio has been successfully verified by experimental results on ethanol oxidation on PtRu/C catalysts with same particle size and same degree of alloying but different metal loading. Tests in direct ethanol fuel cells showed that, compared to 20 wt% PtRu/C, the negative effect of the lower x(i)/d on the catalytic activity of 30 and 40 wt% PtRu/C catalysts was superior to the positive effect of the thinner catalyst layer.
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