Mg-doped WO3 as a novel photocatalyst for visible light-induced water splitting

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 posi...

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Bibliographic Details
Published inCatalysis letters Vol. 80; no. 1-2; pp. 53 - 57
Main Authors DONG WON HWANG, JINDO KIM, TAC JIN PARK, JAE SUNG LEE
Format Journal Article
LanguageEnglish
Published Dordrecht Springer 01.05.2002
Springer Nature B.V
Subjects
Affinity
Chemistry
Conduction bands
Doping
Electron affinity
Energy gap
Exact sciences and technology
General and physical chemistry
Magnesium
Photocatalysts
Photochemistry
Physical chemistry of induced reactions (with radiations, particles and ultrasonics)
Tungsten oxides
Valence band
Water splitting
Water
Heterogeneous catalysis
Tungsten oxide
Hydrogen
Transition metal Compounds
Photocatalysis
Modified catalyst
Magnesium
Experimental study
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Summary: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.
ISSN:1011-372X
1572-879X
DOI:10.1023/A:1015322625989