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Study on Electrocatalytic Activity of Platinum for Hydrogen Oxidation in Acidic Solution by Scanning Electrochemical Microscopy
Author(s) -
Yin YueHua,
Niu Lin,
Cao XiaoLi
Publication year - 2009
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.200900158
Subject(s) - scanning electrochemical microscopy , chemistry , platinum , electrochemistry , substrate (aquarium) , inorganic chemistry , analytical chemistry (journal) , electrocatalyst , electrode , catalysis , chromatography , organic chemistry , oceanography , geology
Abstract The electrocatalytic activity of platinum for hydrogen oxidation in 0.01 M H 2 SO 4 + 0.1 MNa 2 SO 4 solution has been investigated by scanning electrochemical microscopy (SECM) technique. The cyclic voltammogram (CV), approach curve, area scan imaging and chronoamperometric methods have been used. The results indicate that the imaging capability of the SECM feedback mode can be used more efficiently to visually identify materials' electrocatalytic activity, compared with the approach curve method for identification of the conductive or insulating nature of a surface. The SECM imaging method has demonstrated the effects of Pt substrate potential on the electrocatalytic oxidation of hydrogen under a constant tip potential. It is found that the more positive the Pt substrate potential, the lower the electrocatalytic activity of the Pt. Furthermore, the chronoamperometric results support the variation of the electrocatalytic activity with the Pt substrate potential as well.