期刊
IONICS
卷 24, 期 12, 页码 3905-3914出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-018-2533-3
关键词
PEMFC; Catalyst layer; Reaction interface; Nafion ionomer; Oxygen reduction reaction
资金
- National Key Research and Development Program of China [2016YFB0101205]
- Hubei Province Technology Innovation Project [2016AAA047]
With the growth of new energy economy, proton exchange membrane fuel cell (PEMFC) has great potential to be success. However, the lack of high-performance catalyst layer (CL) especially at cathode limits its applications. It is becoming increasingly important to understand interface property during electrocatalytic oxygen reduction reaction (ORR). Here, the rotating disk electrode (RDE) method is developed to study the temperature and Nafion ionomer content effects on interface formed between Nafion and Pt/C. The results show that the temperature has the significant influence on electrochemical active sites, charging double capacitance, and reaction polarization resistance at low Nafion content region. Excess Nafion loaded in CLs will turn to self-reunion and increase the exposed active sites. We find that the optimum Nafion loading is in the range of 30 to 40wt.%. The highest specific activity we achieve is 107.8A/cm(.Pt)(2) at 60 degrees C with 0.4 of ionomer/catalyst weight ratio, corresponding to the kinetic current 283.5A at 0.9V. This finding provides new insights into enhancing the Pt utilization and designing high-efficiency catalysts for ORR.
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