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Mg-Doped WO3 as a Novel Photocatalyst for Visible Light-Induced Water Splitting

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Abstract

Mg-doped WO3 with band gap energy of about 2.6 eV is a viable photocatalyst for visible light-induced water splitting in the presence of hole scavengers. The conduction band edge position of p-type Mg-doped WO3 was -2.7 V versus SCE at pH 12. By doping Mg on WO3, the conduction and valence band positions were shifted by 2.25 V negatively, leading to a conduction band edge position which was negative enough for H+ ions to be reduced thermodynamically, with little change in band gap energy. The negative shift in band position might be ascribed to lowering of the effective electron affinity of WO3 by doping Mg with a very low electron affinity.

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Authors and Affiliations

  1. Department of Chemical Engineering and School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Pohang, 790-784, Republic of Korea

    Dong Won Hwang, Tae Jin Park & Jae Sung Lee

  2. Clean Technology Research Center, Korea Institute of Science and Technology, 39-1 Hawolkok-dong, Sungbuk-gu, Seoul, 136-791, Republic of Korea

    Jindo Kim

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  1. Dong Won Hwang
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  2. Jindo Kim
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  3. Tae Jin Park
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  4. Jae Sung Lee
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Hwang, D.W., Kim, J., Park, T.J. et al. Mg-Doped WO3 as a Novel Photocatalyst for Visible Light-Induced Water Splitting. Catalysis Letters 80, 53–57 (2002). https://doi.org/10.1023/A:1015322625989

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