Divalent-metal-ion (Zn2+ or Mg2+)-doped GaN with d10 electronic configuration was found to make a high and stable photocatalyst for overall water splitting when combined with RuO2 as a promoter, whereas neither undoped nor tetravalent-metal-ion (Si4+ or Ge4+)-doped GaN showed photocatalytic activity upon loading of RuO2. The present work clearly demonstrated the marked effects of dopants on photocatalytic performance of the metal nitride GaN for water splitting.
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Arai et al. (2006) studied this question.
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