期刊
ANALYTICAL LETTERS
卷 44, 期 8, 页码 1416-1430出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/00032719.2010.520387
关键词
Cyclic voltammetry; Electrochemical impedance spectroscopy; Glassy-carbon; Gold; Multi-walled carbon nanotubes; Triphenylphosphine
The electrochemical oxidation of triphenylphosphine (Ph(3)P) was investigated by means of cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) on glassy-carbon (GC), gold (Au) and multi-walled carbon nanotubes (MWCNT) in acetonitrile (ACN), dichloromethane (DCM), and cyclohexanone (CHN). The electron-transfer kinetics of the redox couple PPh(3)/Ph(3)P(center dot+) on various electrodes was found to increase with the order: Au < MWCNT < GC. The EIS results verify that GC provides faster charge-transfer kinetics since it affords less charge-transfer resistance and thus lower electron-transfer barrier from other electrodes tested. In DCM and CHN greater deviation from reversibility was observed which can be attributed to the poorer polarity of the solvents, which provides an additional barrier for the electron-transfer process.
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