作者: Anil V. Virkar , Yingke Zhou
DOI: 10.1149/1.2722563
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摘要: A mechanism of catalyst particle growth in proton exchange membrane fuel cells (PEMFCs) by Ostwald ripening is presented. Particle occurs as a coupled process involving platinum ion transport through aqueous liquid and/or ionomer, and electron carbon support. The dominating factor degradation supported on the presence ions solution (in ionomer). Experiments were conducted commercial PEMFC electrodes three liquids, PtCl 4 solution, dilute acid deionized water. Pt size grew from ∼4 nm to >20 after 1 week solution. By contrast, no detectable occurred or This demonstrates that higher concentration, faster kinetics. role electronic conduction support was verified conducting experiments an electronically insulating material, namely alumina. While significant carbon, observation complete accord with model, degradation. That is, when alumina, lack path suppresses even present