کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
193163 459763 2007 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of operating potential and temperature on degradation of electrocatalyst layer for PEFCs
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Effects of operating potential and temperature on degradation of electrocatalyst layer for PEFCs
چکیده انگلیسی

The objective of this research work is to clarify essential factors related to degradation of PEFC electrodes. The degradation of Pt catalysts and the carbon support after a daily start and stop (DSS) operation was evaluated separately by measuring the electrochemical active area (SPt) and the double layer charging current (IDL) with cyclic voltammetry without and with CO adsorption on Pt catalyst surfaces, respectively. Corrosion of the carbon support was accelerated mainly by raising the operating potential to 0.90 V, which was observed by increase in IDL. The high-temperature operation at 90 °C or high-potential operation at 0.90 V resulted in a dramatic decrease in SPt. In contrast, it was found that the apparent cell performance was not so degraded probably because the decrease in SPt was cancelled by an increase in the proton conductance in the swollen ionomer. The agglomeration of Pt catalyst particles and their migration in the electrolyte membrane were also analyzed by TEM observation after the DSS operations.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 52, Issue 19, 25 May 2007, Pages 5997–6005
نویسندگان
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