Direct electrochemistry of cytochrome c on a multi-walled carbon nanotubes modified electrode and its electrocatalytic activity for the reduction of H2O2

被引：214

作者：

Zhao, GC ^{[1
]}

Yin, ZZ ^{[1
]}

Zhang, L ^{[1
]}

Wei, XW ^{[1
]}

机构：

[1] Anhui Normal Univ, Sch Chem & Mat Sci, Anhui Key Lab Funct Mol Solids, Wuhu 241000, Peoples R China

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2005年 / 7卷 / 03期

基金：

中国国家自然科学基金;

关键词：

cytochrome c; multi-walled carbon nanotubes; direct electrochemistry; biosensor;

D O I：

10.1016/j.elecom.2005.01.006

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Direct electrochemistry of cytochrome c (Cyt c), which was adsorbed on the surface of multi-walled carbon nanotubes (MWNTs), was investigated. The results from electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) suggested that Cyt c could be tightly adsorbed on the surface of MWNTs and MWNTs show an obvious promotion for the direct electro-transfer between Cyt c and electrode. A couple of well-defined and quasi-reversible CV peaks of Cyt c can be observed in a phosphate buffer solution (pH 7.0). Cyt c adsorbed on MWNTs exhibits a remarkable electrocatalytic activity for the reduction of hydrogen peroxide (11201). The calculated apparent Michaelis-Menten constant (K-m(app)) was 857 muM, indicating a high catalytic activity of Cyt c adsorbed on MWNTs modified electrode to the reduction of H2O2. Based on these, a third generation reagentless biosensor can be constructed for the determination of H2O2. (C) 2005 Elsevier B.V. All rights reserved.

引用

页码：256 / 260

页数：5

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