Improved catalytic performance of Pt/TiO2 nanotubes electrode for ammonia oxidation under UV-light illumination

被引：34

作者：

Liu, Jie ^{[1
]}

Liu, Bin ^{[1
]}

Ni, Zhengyang ^{[1
]}

Deng, Yida ^{[2
]}

Zhong, Cheng ^{[2
]}

Hu, Wenbin ^{[1
,2
]}

机构：

[1] Shanghai Jiao Tong Univ, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China

[2] Tianjin Univ, Dept Mat Sci & Engn, Tianjin 300072, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2014年 / 150卷

基金：

美国国家科学基金会;

关键词：

Platinum; Titania nanotube; Ammonia oxidation; Photoelectrocatalyst; UV illumination; ELECTROCHEMICAL OXIDATION; BINARY-ALLOYS; PT-IR; METHANOL OXIDATION; SURFACTANT-FREE; TIO2; ELECTROCATALYSTS; NANOPARTICLES; CARBON; ELECTROOXIDATION;

D O I：

10.1016/j.electacta.2014.10.119

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

An improved catalytic performance of Pt/TiO2 nanotubes for ammonia oxidation under UV illumination was reported for the first time. Flower-like Pt particles consisting of many Pt nanosheets were electrodeposited on TiO2 nanotubes grown on a Ti foil. The surface morphology and composition of the prepared Pt/TiO2 nanotubes were investigated by the scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction. The electrochemical behaviour of the prepared Pt/TiO2 nanotubes electrode for the ammonia oxidation was investigated with or without UV illumination. The results showed that the Pt deposits have a face-centered cubic structure and TiO2 nanotubes are in the form of anatase phase after annealing. Illumination of UV light on the surface of Pt/TiO2 nanotubes remarkably enhances the cyclic voltammetric and chronoamperometric responses for ammonia oxidation. This clearly demonstrates that the catalytic activity of the Pt/TiO2 nanotubes is enhanced compared to that without UV illumination due to a synergistic effect between the electrocatalysis and photocatalysis. The improved performance of the Pt/TiO2 nanotubes for ammonia oxidation is attributed to the photogenerated holes in the TiO2 which could oxidize ammonia molecules during UV illumination. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：146 / 150

页数：5

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