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The study of oxygen spillover and back spillover on Pt/TiO2 by a potential dynamic sweep method

机译:The study of oxygen spillover and back spillover on pt/TiO2 by a potential dynamic sweep method

摘要

Oxygen spillover and back spillover on Pt/TiO2 catalysts have been studied by a potential dynamic sweep method. The characteristics of I-V profiles of Pt/TiO2 electrodes in the three potential sweep regions are different from those of Pt and TiO2 electrodes. The catalytic role of Pt/TiO2 in oxygen spillover and back spillover is identified. It decreases, and the electrochemical oxygen adsorption (or desorption) increases with elevating temperature of hydrogen post-treatment of Pt/TiO2; to a certain extent (hydrogen post-treatment of Pt/TiO2 at 700 degrees C), the control step of oxygen electrode process (anodic oxidation or cathodic reduction) changes from oxygen diffusion to electrochemical oxygen adsorption or desorption, respectively. Increasing the amount of Pt supported on TiO2 enhances the processes of oxygen spillover and back spillover. (C) 1999 Elsevier Science B.V. All rights reserved.
机译:通过潜在的动态扫描方法研究了Pt / TiO2催化剂上的氧气溢出和反向溢出。在三个电位扫描区域中Pt / TiO2电极的I-V曲线的特性与Pt和TiO2电极的I-V曲线的特性不同。确定了Pt / TiO2在氧气溢出和反溢出中的催化作用。随着Pt / TiO2氢气后处理温度的升高,其降低,电化学氧的吸附(或解吸)增加;在一定程度上(Pt / TiO2在700℃下进行氢气后处理),氧电极工艺的控制步骤(阳极氧化或阴极还原)分别从氧扩散变为电化学氧吸附或脱附。增加负载在TiO2上的Pt的数量会增强氧气溢出和反溢出的过程。 (C)1999 Elsevier Science B.V.保留所有权利。

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    Lin HX;

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