Photocatalytic Water Splitting Using Modified GaN:ZnO Solid Solution under Visible Light: Long-Time Operation and Regeneration of Activity

详细信息    查看全文

• 作者：Tomoyuki Ohno ; Lu Bai ; Takashi Hisatomi ; Kazuhiko Maeda ; Kazunari Domen
• 刊名：The Journal of the American Chemical Society
• 出版年：2012
• 出版时间：May 16, 2012
• 年：2012
• 卷：134
• 期：19
• 页码：8254-8259
• 全文大小：384K
• 年卷期：v.134,no.19(May 16, 2012)
• ISSN：1520-5126

文摘

Overall water splitting using GaN:ZnO solid solution photocatalyst modified with Rh_2鈥?i>yCr_yO₃ nanoparticles as H₂ evolution cocatalysts under visible light (400 < 位 < 500 nm) was examined with respect to long-term durability and regeneration of photocatalytic activity. The rate of visible light water splitting remained unchanged for 3 months (2160 h), producing H₂ and O₂ continuously at a stoichiometric amount. After 6 months of operation, a 50% loss of the initial activity occurred. Regeneration treatment of deactivated catalysts was attempted by reloading the Rh_2鈥?i>yCr_yO₃ cocatalyst. The degree of activity regeneration depended on the reloading amount. Up to 80% of the initial activity for H₂ evolution could be recovered under optimal treatment conditions. It was also found that deactivation of GaN:ZnO was suppressed to some extent by prior coloading of an O₂ evolution cocatalyst, which helped to suppress oxidative decomposition of GaN:ZnO by valence band holes, thereby improving the durability.