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Published on: May 2, 2014
Fabrication of PbS/CdS/TiO2nanotube array for enhanced photoelectrochemical response and photocathodic protection
Chong Peng1, Yun Gao1, Rongjie Gao1
1School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, People's Republic of China.
Abstract:
A ternary stepped heterojunction of PbS/CdS/TiO2was fabricated using the successive ionic layer adsorption and reaction method, which significantly enhanced the photocathodic protection performance of TiO2. The experimental results demonstrate the superiority of the dual-loading modification over its single-loading counterparts. The co-loading of CdS and PbS resulted in a TiO2nanocomposite with a reduced bandgap of 1.0 eV, a further extended light absorption range, and enhanced visible light utilization efficiency. The PbS/CdS/TiO2electrode exhibited a photogenerated current density of 6.46 mA cm-2, which is 1.6 times and 22.1 times higher than that of PbS/TiO2and pure TiO2, respectively. The dual loading of metal sulfide semiconductors markedly improved the photoelectrochemical properties of TiO2and its corresponding photocathodic protection effect.
