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Study on the Impedance Characteristic and Electrocatalytic Activity of Platinum‐Modified Polyaniline Film
Author(s) -
Niu Lin,
Li Qiuhong,
Chen Xiao,
Wei Fenghua,
Wang Hao,
Zhang Hu
Publication year - 2003
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.200300165
Subject(s) - polyaniline , platinum , chemistry , dielectric spectroscopy , polarization (electrochemistry) , electrode , electrochemistry , double layer capacitance , inorganic chemistry , analytical chemistry (journal) , chemical engineering , organic chemistry , polymer , catalysis , polymerization , engineering
The composite electrode of platinum‐modified polyaniline film is formed in 0.5 M H 2 SO 4 + 3 mM H 2 PtCl 6 solution by cyclic potential or constant potential deposition of platinum particles in polyaniline film. To make a comparison, the polyaniline film with the same initial thickness and structure is also treated with the cyclic potential or constant potential polarization in 0.5 M H 2 SO 4 solution. The electrochemical impedance spectroscopy (EIS) of the composite electrode of platinum‐modified polyaniline film is studied in sulfuric acid solution and compared with the EIS of the polyaniline film without platinum dispersion. The results show that the different modes of potential polarization affect greatly the nature and distribution of the platinum particles, instead of the structure of the polyaniline film (matrix). The electrode reaction kinetics and mass transport process parameters involving charge transfer resistance ( R ct ), double layer capacitance ( C dl ), constant phase elements (CPE) and Warburg impedance in platinum substrate/platinum‐modified polyaniline film/solution interface are discussed on the basis of the interpretation of the characteristic impedance spectra and connected to the electrocatalytic activity on the oxidation of methanol molecules.