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电化学  2013 

Na2CO3对TiO2纳米管电极表面光电化学水分解反应的催化作用研究

, PP. 71-78

Keywords: 光生空穴,表面复合,光电流,阳极析氧,Mott-Schottky分析

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Abstract:

光生载流子在半导体/溶液界面处发生的表面复合过程,是制约半导体光电极体系光-电转化效率提高的关键因素之一.本文利用光电流测量和交流阻抗等技术,初步研究了Na2CO3对TiO2纳米管电极表面光电化学水分解反应的催化作用,并对“TiO2/溶液”界面处与阳极析氧有关的光生电荷传输过程及特点进行了探讨.结果表明,在0.5mol?L-1NaClO4溶液中加入少量的Na2CO3(1mmol?L-1),能够显著促进光生空穴穿过TiO2/溶液界面向溶液中的传输,有效地抑制光生载流子的表面复合过程,从而相应地增大外电路的光电流,提高TiO2光电极体系的光-电转化效率.

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