Multielectrocatalysis by Layer-by-Layer Films Based on Pararosaniline and Vanadium-Substituted Phosphomolybdate

被引:36
作者
Fernandes, Diana M. [1 ]
Teixeira, Alexandra [1 ]
Freire, Cristina [1 ]
机构
[1] Univ Porto, Fac Ciencias, Dept Quim & Bioquim, REQUIMTE, P-4169007 Oporto, Portugal
关键词
POLYELECTROLYTE MULTILAYER FILMS; POLYOXOMETALATE CLUSTER ANIONS; ORGANIC-DYE CATIONS; ELECTROCHEMICAL-BEHAVIOR; ELECTROCATALYTIC PROPERTIES; KEGGIN-TYPE; EUROPIUM PHOSPHOMOLYBDATE; AMPEROMETRIC SENSOR; HYBRID MATERIALS; ULTRATHIN FILMS;
D O I
10.1021/la5043266
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Hybrid multilayer films based on the two molecular species pararosaniline (PR) and Keggin-type polyoxometalate K-5[PMo11VO40)] (PMo11V) were prepared on different substrates using the electrostatic layer-by-layer (LbL) self-assembly method. The film buildup, monitored by electronic spectroscopy, showed a regular stepwise growth, and X-ray photoelectron spectroscopy data confirmed the presence of both molecular components within the LbL films. Scanning electron microscopy images revealed a completely covered surface with a nonuniform distribution of film components, and atomic force microscopy images confirmed a rough surface. The film electrochemical responses and permeability were studied by cyclic voltammetry. Films revealed three Mo-based redox processes (Mo-VI -> Mo-V) and one V-based redox process (V-V -> V-IV) in the potential range between 0.8 and -0.4 V vs Ag/AgCl. Studies with the redox probes [Fe(CN)(6)](3-/4-) and [Ru(NH3)(6)](3+/2+) showed that the films maintain the permeability even after six bilayers. Furthermore, the {PR/PMo11V}n multilayer films exhibit excellent Mo-based electrocatalytic activity toward reduction of iodate and V-based electrocatalytic activity toward ascorbic acid oxidation, thus acting as a versatile multielectrocatalyst.
引用
收藏
页码:1855 / 1865
页数:11
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