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Oxidation of Carbon Supports at Fuel Cell Cathodes: Differential Electrochemical Mass Spectrometric Study
Ming-fang Li1, Qian Tao1, Ling-wen Liao1, Jie Xu1, Jun Cai2, Yan-xia Chen*1
1.Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China;2.Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei 230026, China
Abstract:
The effects of O2 and the supported Pt nano-particles on the mechanisms and kinetics of the carbon support corrosion are investigated by monitoring the CO2 production using differential electrochemical mass spectrometry in a dual-thin layer flow cell. Carbon can be oxidized in different distinct potential regimes; O2 accelerates carbon oxidation, the rates of CO2 production from carbon oxidation in O2 saturated solution are two times of that in N2 saturated solution at the same potential; Pt can catalyze the carbon oxidation, with supported Pt nanoparticles, the overpotential for carbon oxidation is much smaller than that without loading in the carbon electrode. The mechanism for the enhanced carbon oxidation by Pt and O2 are discussed.
Key words:  Carbon corrosion, Pt, Fuel cell cathode, Differential electrochemical mass spectrometry
FundProject:
利用电化学微分质谱在燃料电池的阴极研究碳载体的氧化
李明芳1, 陶骞1, 廖玲文1, 徐杰1, 蔡俊2, 陈艳霞*1
1.中国科学技术大学合肥微尺度物质科学国家实验室,化学物理系,合肥230026;2.中国科学技术大学物理学院光学与光学工程系,合肥230026
摘要:
利用电化学微分质谱,在双薄层流动电解池中,通过检测二氧化碳产物的信号研究氧气与铂纳米粒子对碳载体氧化机理与动力学的影响.研究发现,碳载体可以在不同的电位区间内被氧化;氧气可以加速碳的氧化,在相同的电位下碳氧化生成二氧化碳产物的速率在氧气饱和溶液中是在氮气饱和溶液中的两倍;铂纳米粒子可以催化碳的氧化,在碳电极上,担载的铂纳米粒子可以大大降低碳氧化的过电势.讨论了铂与氧气促进碳氧化的机理.
关键词:  碳氧化,铂,氧气,二氧化碳的电化学微分质谱
DOI:10.1088/1674-0068/23/04/442-446
分类号: