Pt/C催化剂氧还原反应的交流阻抗动态研究

doi:10.13208/j.electrochem.160310

电化学（中英文） ›› 2016, Vol. 22 ›› Issue (5): 542-548. doi: 10.13208/j.electrochem.160310

Pt/C催化剂氧还原反应的交流阻抗动态研究

史坤明^1,2，郭建伟^2* ，王佳¹

1.中国海洋大学化学化工学院，山东青岛 266003; 2. 清华大学核能与新能源技术研究院，北京 100084

收稿日期:2016-03-10 修回日期:2016-04-10 出版日期:2016-10-28 发布日期:2016-04-27
通讯作者: 郭建伟 E-mail:jwguo@mail.tsinghua.edu.cn
基金资助:
国家自然科学基金项目（51273103, 50873050, 51573084）、国家973计划(2012CB215500)资助

The Study of Dynamical Electrochemical Impedance Spectroscopy for Oxygen Reduction Reaction on Pt/C Catalyst

SHI Kun-ming^1,2 , GUO Jian-wei ²*, WANG Jia¹

1 College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266003,Shandong, China; 2 Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China

Received:2016-03-10 Revised:2016-04-10 Published:2016-10-28 Online:2016-04-27
Contact: GUO Jian-wei E-mail:jwguo@mail.tsinghua.edu.cn

摘要/Abstract

摘要：

本文通过RDE和EIS联合技术、等效电路模型，研究了酸性体系中商业Pt/C催化剂ORR行为. 研究发现Pt/C动态界面包括两个彼此独立的过程：1）Pt表面原有PtO还原至Pt过程，2）ORR促进新PtO形成过程，为催化材料稳定性及活化性提供了关键依据；并发现动态界面促进多孔电极重构以及与传输匹配过程.在高过电位下，ORR的高反应速率可通过增加催化材料憎水性予以改善. 上述研究结果可对ORR的直流电化学研究进行有效补充，并提供建模基础.

关键词: 燃料电池, Pt/C催化剂, 氧还原反应, 旋转圆盘电极, 电化学阻抗谱

Abstract:

With joint techniques of rotating disc electrode(RDE) and electrochemical impedance spectroscopy(EIS), and further establishment on equivalent circuit model, this paper studied oxygen reduction reaction(ORR) on commercial Pt/C catalyst in acid medium. Our results found that the dynamical interface on Pt/C consists of two independent processes: 1) the PtO reduction from Pt surface, 2) the new PtO formation from ORR, thus providing key clues for catalyst stability and activity. This also implied that the dynamical interface facilitates reconstruction for porous electrode, and matches with mass transfer. One important issue is discovered that at high overpotential, the high reaction rate for ORR can be further improved if providing hydrophobicity on catalyst surface. All these efforts on ORR progress not only compensate for DC electrochemistry study, but also provide basis for future model establishment.

Key words: fuel cells, Pt/C catalyst, oxygen reduction reaction, rotating disk electrode, electrochemical impedance spectroscopy

中图分类号:

TM911.4
O646

史坤明，郭建伟，王佳. Pt/C催化剂氧还原反应的交流阻抗动态研究[J]. 电化学（中英文）, 2016, 22(5): 542-548.

SHI Kun-ming, GUO Jian-wei, WANG Jia. The Study of Dynamical Electrochemical Impedance Spectroscopy for Oxygen Reduction Reaction on Pt/C Catalyst[J]. Journal of Electrochemistry, 2016, 22(5): 542-548.

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链接本文: https://electrochem.xmu.edu.cn/CN/10.13208/j.electrochem.160310

https://electrochem.xmu.edu.cn/CN/Y2016/V22/I5/542

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Pt/C催化剂氧还原反应的交流阻抗动态研究

The Study of Dynamical Electrochemical Impedance Spectroscopy for Oxygen Reduction Reaction on Pt/C Catalyst

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