Visible Light Absorbing TiO ₂ Nanotube Arrays by Sulfur Treatment for Photoelectrochemical Water Splitting

[1 ]Center for Nanomaterials and Chemical Reactions, Institute for Basic Science, Daejeon 305-701, South Korea

[2 ]Department of Chemical Engineering, Yeungnam University, Gyeongsan 712-749, South Korea

[3 ]Department of Chemistry Education and Optoelectronics Convergence Research Center, Chonnam National University, Gwangju 500-757, South Korea

[4 ]Department of Materials Science and Engineering, Chonnam National University, Gwangju 500-757, South Korea