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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 34, Number 2
BKCSDE 34(2)
February 20, 2013 

 
Title
Direct Electrochemistry and Electrocatalysis of Myoglobin with CoMoO4 Nanorods Modified Carbon Ionic Liquid Electrode
Author
Zengying Zhao, Lili Cao, Anhui Hu, Weili Zhang, Xiaomei Ju, Yuanyuan Zhang, Wei Sun*
Keywords
Carbon ionic liquid electrode, Electrochemistry, CoMoO4 nanorods, Myoglobin
Abstract
By using ionic liquid 1-hexylpyridinium hexafluorophosphate (HPPF6) based carbon ionic liquid electrode (CILE) as the substrate electrode, a CoMoO4 nanorods and myoglobin (Mb) composite was casted on the surface of CILE with chitosan (CTS) as the film forming material to obtain the modified electrode (CTS/ CoMoO4-Mb/CILE). Spectroscopic results indicated that Mb retained its native structures without any conformational changes after mixed with CoMoO4 nanorods and CTS. Electrochemical behaviors of Mb on the electrode were carefully investigated by cyclic voltammetry with a pair of well-defined redox peaks from the heme Fe(III)/Fe(II) redox center of Mb appeared, which indicated that direct electron transfer between Mb and CILE was realized. Electrochemical parameters such as the electron transfer number (n), charge transfer coefficient (α) and electron transfer rate constant (ks) were estimated by cyclic voltammetry with the results as 1.09, 0.53 and 1.16 s−1, respectively. The Mb modified electrode showed good electrocatalytic ability toward the reduction of trichloroacetic acid in the concentration range from 0.1 to 32.0 mmol L−1 with the detection limit as 0.036 mmol L−1 (3σ), and the reduction of H2O2 in the concentration range from 0.12 to 397.0 μmol L− 1 with the detection limit as 0.0426 μmol L−1 (3σ).
Page
475 - 481
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