Highly spatial imaging of electrochemical activity on the wrinkles of graphene using all-solid scanning electrochemical cell microscopy
作者机构：State Key Ldioratory of Analytical Chemistry for Life ScienceSchool of Chemistry and Chemical Engineering Nanjing UniversityNanjing Jiangsiif 210023China School of Mechanical EngineeringXi'an Jiaotong UniversityXi'anShanxi710049China
出 版 物：《Fundamental Research》 (自然科学基础研究（英文版）)
年 卷 期：2022年第2卷第2期
页 面：193-197页
学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0803[工学-光学工程]
基 金：This work was supported by the National Natural Science Foundation of China(Grant nos.22025403 21974060 and 21874069)
主 题：Scanning electrochemical cell microscopy Solid electrolyte High spatial resolution Electrochemical activity Wrinkle
摘 要：Here,all-solid scanning electrochemical cell microscopy(SECCM)is first established by filling polyacrylamide(PAM)into nanocapillaries as a solid electrolyte.A solid PAM nanoball at the tip of a nanocapillary contacts graphene and behaves as an electrochemical cell for simultaneously measuring the morphology and electrochemical *** with liquid droplet-based SECCM,this solid nanoball is stable and does not leave any electrolyte at the contact regions,which permits accurate and continuous scanning of the surface without any ***,the resolutions in the lateral(x-y)and vertical(z)directions are improved to〜10 *** complete scanning of the wrinkles on graphene records low currents at the two sidewalls of the wrinkles and a relatively high current at the center of the *** heterogeneity in the electrochemical activity of the wrinkle illustrates different electron transfer features on surfaces with varied curvatures,which is hardly observed by the current electrochemical or optical *** successful establishment of this high spatial electrochemical microscopy overcomes the current challenges in investigating the electrochemical activity of materials at the nanoscale,which is significant for a better understanding of electron transfer in materials.
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