Compositing effects of CuBi₂O₄ on visible-light responsive photocatalysts

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• 作者：Masami Nishikawa ; ^{nishikawa@vos.nagaokaut.ac.jp" class="auth_mail" title="E-mail the corresponding author} ; Soichiro Yuto ; Takahiro Hasegawa ; Wataru Shiroishi ; Hou Honghao ; Yukihiro Nakabayashi ; Yoshio Nosaka ; Nobuo Saito
• 关键词：Photocatalyst ; Composite ; z-scheme ; CuBi2O4 ; WO3 ; BiVO4
• 刊名：Materials Science in Semiconductor Processing
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：57
• 期：Complete
• 页码：12-17
• 全文大小：667 K

文摘

The compositing of two kinds of semiconductors is an effective approach for enhancement of the photocatalytic performance. We examined the compositing effects of p-type CuBi₂O₄ on two kinds of n-type visible-light responsive photocatalysts (WO₃ and BiVO₄). For the composite photocatalysts of CuBi₂O₄/WO₃ and CuBi₂O₄/BiVO₄, z-scheme type charge transfer would dominantly proceed based on ESR spectroscopy and chemiluminescence photometry. Furthermore, the opposite tendency in the compositing effect of the CuBi₂O₄ was observed for WO₃ and BiVO₄. For WO₃, the photocatalytic activity decreased after compositing of CuBi₂O₄. In contrast, for BiVO₄, the photocatalytic activity increased after compositing of CuBi₂O₄. These results would be related to the recombination rate of electrons in the CuBi₂O₄ with holes in the photocatalysts (WO₃ and BiVO₄).