Understanding Interface between Electrode and Electrolyte: Organic/Inorganic Hybrid Design for Fast Ion Conductivity

作者：Chung Dong Young; Chung Young Hoon; Kim Sungmin; Lim Ju Wan; Lee Kyung Jae; Jung Namgee; Shin Hyeyoung; Kim Ok Hee; Kim Hyungjun; Yoo Sung Jong; Sung Yung Eun^*

来源：Journal of Physical Chemistry C, 2015, 119(17): 9169-9176.

DOI：10.1021/acs.jpcc.5b02075

Ion transport is an important issue in electrochemical-based energy conversion and storage devices. Ion transport at the interface of the electrode and electrolyte is critical for performance. However, there is little understanding of the interface phenomena based on ion transport properties. Here, the proton transport behavior in a Nation membrane (electrolyte) and that of an ionomer in the catalyst layer (electrode/electrolyte interface) was investigated simultaneously by electrochemical impedance spectroscopy. Our study indicates that the proton transport behavior in the catalyst layer is different from that in membrane. To elucidate the interface phenomena, we analyzed the Nafion electrolyte and proton behavior by molecular dynamics (MD). On the basis of the MD results, we modified the catalyst with a hybrid of inorganic Pt catalyst and organic 3-mercaptopropionic acid to promote a positive interfacial reaction between the electrolyte and electrode, which resulted in improved proton transport and performance.

• 出版日期2015-4-30
• 单位中国人民解放军海军大连舰艇学院