Electrochemistry and electrocatalysis of polyoxometalate-ordered mesoporous carbon modified electrode.
Electrochemistry and electrocatalysis of polyoxometalate-ordered mesoporous carbon modified electrode.
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DOI：
10.1016/j.aca.2007.01.017
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发表时间：
2007-03
影响因子：
6.2
通讯作者：
Ming Zhou;Liping Guo;Fan Lin;Hai-xia Liu
中科院分区：
文献类型：
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作者：
Ming Zhou;Liping Guo;Fan Lin;Hai-xia Liu
本论文以聚氧乙烯酸盐H6 P2 Mo 18 O 62·xH 2 O（P2 Mo 18）为催化剂，发展了一种方便、有效的有序介孔碳（OMC）功能化方法。首次将P2 Mo 18固定在OMC通道表面，制备了P2 Mo 18修饰玻碳电极，并对其进行了表征。改性后的OMC颗粒具有较大的比表面积和多孔结构，使其具有较高的杂多酸负载量，且P2 Mo 18稳定地包埋在有序基质中。采用傅里叶变换红外光谱（FTIR）、氮气吸附-脱附等温线和X射线衍射（XRD）等方法研究了OMC与P2 Mo 18之间的相互作用。对修饰电极的pH依赖性、稳定性等电化学行为进行了研究，循环伏安法（CV）和安培法研究表明，P2 Mo 18/OMC/GC电极对亚硝酸根、溴酸根、艾杜糖酸根和过氧化氢的还原具有良好的电催化活性，且稳定性好，响应速度快。探讨了P_2Mo_（18）/OMC/GC电极的催化机理。此外，OMC功能化方法的发展表明了OMC在催化、分子电子学和传感器方面的潜在应用。
In this work, we have developed a convenient and efficient method for the functionalization of ordered mesoporous carbon (OMC) using polyoxometalate H6P2Mo18O62·xH2O (P2Mo18). By the method, glassy carbon (GC) electrode modified with P2Mo18which was immobilized on the channel surface of OMC was prepared and characterized for the first time. The large specific surface area and porous structure of the modified OMC particles result in high heteropolyacid loading, and the P2Mo18entrapped in this order matrix is stable. Fourier transform infrared spectroscopy (FTIR), nitrogen adsorption–desorption isotherm and X-ray diffraction (XRD) were employed to give insight into the intermolecular interaction between OMC and P2Mo18. The electrochemical behavior of the modified electrode was studied in detail, including pH-dependence, stability and so on. The cyclic voltammetry (CV) and amperometry studies demonstrated that P2Mo18/OMC/GC electrode has high stability, fast response and good electrocatalytic activity for the reduction of nitrite, bromate, idonate, and hydrogen peroxide. The mechanism of catalysis on P2Mo18/OMC/GC electrode was discussed. Moreover, the development of our approach for OMC functionalization suggests the potential applications in catalysis, molecular electronics and sensors.