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ZrW2O8 photocatalyst and its visible-light sensitization via sulfur anion doping for water splitting by Li Jiang; Qizhao Wang; Caolong Li; Jian Yuan; Wenfeng Shangguan is a Engineering article available to read on EtoBox.

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ZrW 2 O 8 prepared by hydrothermal reaction was found to act as a photocatalyst for water splitting under UV light irradiation. It has good activity for water splitting to evolve H 2 and O 2 steadily in the presence of CH 3 OH and AgNO 3 as electron donor and electron scavenger respectively. With respect to the band structure for photocatalytic water splitting, ZrW 2 O 8 (4.0 eV) was found to be superior to ZrO 2 (5.0 eV) with a wider band gap and WO 3 (2.7 eV) with CB bottom more positive than the reduction potential of H þ to H 2 . The improvement of the band structure was attributed to the hybridization of W5d and Zr4d in conduction band (CB) as well as the change in crystal structure. Moreover, the absorption edge of ZrW 2 O 8 was significantly extended to visible-light region by sulfur anion doping, and H 2 could be evolved over Pt/S-ZrW 2 O 8 under irradiation up to 360 nm in the presence of CH 3 OH while O 2 could be evolved over S-ZrW 2 O 8 under irradiation up to 510 nm in the presence of AgNO 3 . The visible-light sensitization was attributed to the S3p states, which increased the width of the VB itself and caused the decrease in the band gap energy.

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Author

Li Jiang; Qizhao Wang; Caolong Li; Jian Yuan; Wenfeng Shangguan

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0360-3199)

Published

2010

Language

EN

Field

Engineering (Physical Sciences)