标题：Perovskite photocatalyst CsPbBr3-xIx with a bandgap funnel structure for H2 evolution under visible light
作者：Guan, Zihan ;Wu, Yaqiang ;Wang, Peng ;Zhang, Qianqian ;Wang, Zeyan ;Zheng, Zhaoke ;Liu, Yuanyuan ;Dai, Ying ;Whangbo, Myung-Hwan ;Huang, Baibiao
作者机构：[Guan, Zihan ;Wu, Yaqiang ;Wang, Peng ;Zhang, Qianqian ;Wang, Zeyan ;Zheng, Zhaoke ;Liu, Yuanyuan ;Huang, Baibiao ] State Key Laboratory of Crystal Ma 更多
来源：Applied Catalysis B: Environmental
摘要：A simple and efficient light-assisted method is employed to prepare powder samples of all-inorganic mixed-perovskite CsPbBr3-xIx from CsPbBr3 by ion exchange in aqueous HBr/KI solution such that the concentration of I in a sample particle decreases on going from the surface to the interior. CsPbBr3-xIx/Pt, namely, CsPbBr3-xIx samples loaded with Pt nanoparticles, shows a high performance for the hydrogen evolution under visible-light irradiation in aqueous HBr solution saturated with CsPbBr3. The H2 evolution rate of the CsPbBr3-xIx/Pt powders (200 mg) is determined to be 224 μmol h−1, under 120 mW cm-2 visible-light (λ ≥ 420 nm) illumination. The CsPbBr3-xIx samples have a high stability, with no apparent decrease in the catalytic activity after 50 h of repeated H2 evolution experiments. The apparent quantum efficiency of CsPbBr3-xIx/Pt is determined to be 2.15% under the irradiation of 450 nm light.
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