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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0.5 mol.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,从而相应地增大了外电路的光电流,并使TiO2光电极体系的光-电转化效率得到提高.
The surface recombination process of photo-generated carriers at the semiconductor / solution interface is one of the key factors to control the photo-to-electric conversion efficiency of semiconductor photoelectrode system.In this paper, TiO2 nanotubes electrode surface photoelectrochemical water decomposition reaction catalysis, and “TiO2 / solution ” interface at the anode and the oxygen evolution of the photoacid charge transfer process and the characteristics were discussed.The results showed that in 0.5 mol.L- The addition of a small amount of Na2CO3 (1mmol.L-1) to the solution of 1NaClO4 can significantly promote the transport of photogenerated holes into the solution through the interface of TiO2 / solution and effectively suppress the surface recombination of photogenerated carriers, The photocurrent of the external circuit and the photo-to-electricity conversion efficiency of the TiO2 photoelectrode system are improved.