Photocatalytic Activity of (Ga1-xZnx)(N1-xOx) for Visible-Ligh
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- 作者：Kazuhiko Maeda ; Hiroshi Hashiguchi ; Hideaki Masuda ; Ryu Abe ; Kazunari Domen
- 刊名：Journal of Physical Chemistry C
- 出版年：2008
- 出版时间：March 6, 2008
- 年：2008
- 卷：112
- 期：9
- 页码：3447 - 3452
- 全文大小：144K
- 年卷期：v.112,no.9(March 6, 2008)
- ISSN：1932-7455
文摘
The photocatalytic activity of (Ga1-xZnx)(N1-xOx), a solid solution of GaN and ZnO, for H2 and O2 evolutionin the presence of methanol and silver nitrate as sacrificial reagents under visible light (
> 420 nm) isinvestigated in detail. (Ga1-xZnx)(N1-xOx) evolves H2 from an aqueous methanol solution when loaded withnanoparticulate Rh2-yCryO3 as a cocatalyst, and evolves O2 from an aqueous silver nitrate solution without acocatalyst. Structural analyses indicate that the H2 evolution activity is strongly dependent on the crystallinityand composition of the catalyst, while the rate of O2 evolution is proportionally related to the specific surfacearea. The activity for H2 evolution from methanol solution is of the same order as for overall water splitting,but is an order of magnitude lower than that for O2 evolution from silver nitrate solution. The results ofphotocatalytic reactions and photoelectrochemical measurements suggest that the rate-determining step foroverall water splitting using (Ga1-xZnx)(N1-xOx) is the H2 evolution process.
> 420 nm) isinvestigated in detail. (Ga1-xZnx)(N1-xOx) evolves H2 from an aqueous methanol solution when loaded withnanoparticulate Rh2-yCryO3 as a cocatalyst, and evolves O2 from an aqueous silver nitrate solution without acocatalyst. Structural analyses indicate that the H2 evolution activity is strongly dependent on the crystallinityand composition of the catalyst, while the rate of O2 evolution is proportionally related to the specific surfacearea. The activity for H2 evolution from methanol solution is of the same order as for overall water splitting,but is an order of magnitude lower than that for O2 evolution from silver nitrate solution. The results ofphotocatalytic reactions and photoelectrochemical measurements suggest that the rate-determining step foroverall water splitting using (Ga1-xZnx)(N1-xOx) is the H2 evolution process.