Localized Electrochemical Impedance Measurements on Nafion Membranes: Observation and Analysis of Spatially Diverse Proton Transport Using Atomic Force Microscopy

doi:10.1021/acs.analchem.9b02218

	Localized Electrochemical Impedance Measurements on Nafion Membranes: Observation and Analysis of Spatially Diverse Proton Transport Using Atomic Force Microscopy
	Wang, Xiaojiang 2,3; Habte, Bereket T.4,5; Zhang, Shuomeng 2,3; Yang, Houhua 1; Zhao, Jing 6; Jiang, Fangming 4; He, Qinggang 2,3
刊名	ANALYTICAL CHEMISTRY
	2019-09-17
卷号	91 期号:18 页码:11678-11686
ISSN号	0003-2700
DOI	10.1021/acs.analchem.9b02218
通讯作者	Jiang, Fangming(jiangfm@ms.giec.ac.cn) ; He, Qinggang(qghe@zju.edu.cn)
英文摘要	The distribution of ion conductive channels on the Nafion membrane surface, which determines the formation of the three-phase boundary, plays a very important role in improving the performance of proton-exchange membrane fuel cells. Therefore, understanding the microstructures at the catalyst layer/membrane interfaces of proton-exchange membranes is essential. Although current-sensing atomic force microscopy (AFM) can present some surface conductance data, localized impedance measurement providing more accurate proton-transport information is desirable. To obtain this information, in our study, localized electrochemical impedance spectroscopy was measured automatically with a home-built AFM-electrochemical impedance spectroscopy setup in which AFM was coupled with an impedance tester by a customized procedure. By this method, the localized proton-transport resistance at different humidities was observed in spatially diverse locations, and the value decreased as the membrane became hydrated. Furthermore, the microstructure of the Nafion membrane was numerically reconstructed at different hydration levels to examine the relationship between the membrane microstructural morphology and proton-transport resistance. The results showed that the spatial diversity of proton-transport resistance arose from the variable concentration of hydrophilic groups at the contact location of the AFM tip and the membrane, and from the heterogeneity of dry sulfonic acid groups in the membrane that creates local variation in water content.
资助项目	National Natural Science Foundation of China[21676241] ; National Natural Science Foundation of China[U1732111] ; The Recruitment Program of Global Youth Experts from the Chinese government ; Hundred Talents Program of Zhejiang University ; Guangdong Science and Technology Department[2016A030313172] ; Guangzhou Scientific and Technological Development Plan[201804020020]
WOS关键词	EXCHANGE MEMBRANES ; PHASE-SEPARATION ; SURFACE ; CONDUCTIVITY ; IONOMER ; MORPHOLOGY ; HYDROGEN ; VAPOR ; AFM
WOS研究方向	Chemistry
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000487156900028
资助机构	National Natural Science Foundation of China ; The Recruitment Program of Global Youth Experts from the Chinese government ; Hundred Talents Program of Zhejiang University ; Guangdong Science and Technology Department ; Guangzhou Scientific and Technological Development Plan
内容类型	期刊论文
源URL	[http://ir.giec.ac.cn/handle/344007/25661]
专题	中国科学院广州能源研究所
通讯作者	Jiang, Fangming; He, Qinggang
作者单位	1.Metrohm China Ltd, Shanghai 200050, Peoples R China 2.Zhejiang Univ, Coll Chem & Biol Engn, Hangzhou 310027, Zhejiang, Peoples R China 3.Inst Zhejiang Univ Quzhou, 78 Jiuhua Blvd North, Quzhou 324000, Zhejiang, Peoples R China 4.Chinese Acad Sci, Guangzhou Inst Energy Convers, CAS Key Lab Renewable Energy, Lab Adv Energy Syst, Guangzhou 510640, Guangdong, Peoples R China 5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 6.Keysight Technol, Nanotechnol Measurement Div, Shanghai 200080, Peoples R China
推荐引用方式 GB/T 7714	Wang, Xiaojiang,Habte, Bereket T.,Zhang, Shuomeng,et al. Localized Electrochemical Impedance Measurements on Nafion Membranes: Observation and Analysis of Spatially Diverse Proton Transport Using Atomic Force Microscopy[J]. ANALYTICAL CHEMISTRY,2019,91(18):11678-11686.
APA	Wang, Xiaojiang.,Habte, Bereket T..,Zhang, Shuomeng.,Yang, Houhua.,Zhao, Jing.,...&He, Qinggang.(2019).Localized Electrochemical Impedance Measurements on Nafion Membranes: Observation and Analysis of Spatially Diverse Proton Transport Using Atomic Force Microscopy.ANALYTICAL CHEMISTRY,91(18),11678-11686.
MLA	Wang, Xiaojiang,et al."Localized Electrochemical Impedance Measurements on Nafion Membranes: Observation and Analysis of Spatially Diverse Proton Transport Using Atomic Force Microscopy".ANALYTICAL CHEMISTRY 91.18(2019):11678-11686.