扫描电化学显微镜
电化学
玻璃碳
催化作用
电极
过氧化氢
电催化剂
热解炭
材料科学
高定向热解石墨
化学工程
纳米颗粒
纳米技术
化学
循环伏安法
扫描隧道显微镜
热解
有机化学
物理化学
工程类
作者
Srikanth Kolagatla,S. Palaniappan,Alex Schechter
出处
期刊:Chemsuschem
[Wiley]
日期:2019-06-06
卷期号:12 (12): 2708-2714
被引量:10
标识
DOI:10.1002/cssc.201900656
摘要
Electrochemical scanning probe microscopies have become valuable experimental tools, owing to their capability of capturing topographic features in addition to mapping the electrochemical activity of nanoscale oxygen reduction catalysts. However, most scanning probe techniques lack the ability to correlate topographic features with the electrochemical oxygen reduction and peroxide formation in real time. In this report, we show that it is indeed possible to construct high-resolution catalytic current maps at an electrified solid-liquid interface by placing a specially made Au-coated SiO2 Pt atomic force microscopy and scanning electrochemical microscopy (AFM-SECM) dual electrode tip approximately 4-8 nm above the reaction center. The catalytic current measured every 16 nm and high collection efficiency (≈90 %) of the reverse current of peroxide byproducts was also demonstrated with the help of the dual electrode tip. Simultaneous oxygen reduction and intermediate peroxide oxidation current mapping was demonstrated using this Au-coated SiO2 Pt probe on two model surfaces, namely highly oriented pyrolytic graphite and Pt nanoparticles (NPs) supported on a glassy carbon surface.
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