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Cobalt‐Porphyrin‐Catalyzed Oxygen Reduction Reaction: A Scanning Tunneling Microscopy Study
Author(s) -
Cai ZhenFeng,
Wang Xiang,
Wang Dong,
Wan LiJun
Publication year - 2016
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201600435
Subject(s) - catalysis , cobalt , scanning tunneling microscope , porphyrin , electrochemistry , chemistry , substrate (aquarium) , photochemistry , oxygen reduction reaction , scanning electrochemical microscopy , oxygen , electrode , electrolyte , metal , inorganic chemistry , materials science , nanotechnology , organic chemistry , oceanography , geology
We report an in situ electrochemical scanning tunneling microscopy (ECSTM) investigation of the 5,10,15,20‐tetraphenyl‐21 H ,23 H ‐porphine cobalt(II) (CoTPP)‐catalyzed oxygen reduction reaction (ORR). A highly ordered CoTPP adlayer is revealed on the Au(111) electrode. High‐contrast adsorbed species are monitored in CoTPP adlayer in electrolyte containing oxygen, and are attributed to the formation of CoTPP–O 2 complexes. In situ STM results reveal the sharp contrast changes upon switching the substrate potential to trigger the ORR. The results benefit the understanding of the catalytic role of metal porphyrins (MPs) in the ORR, which is important for the design of MP‐based catalysts.