三斜晶系
分解水
光催化
材料科学
光催化分解水
带隙
半导体
光化学
光电子学
晶体结构
化学
结晶学
生物化学
催化作用
作者
Xiaoping Tao,Hongpeng Zhou,Chengbo Zhang,Na Ta,Rengui Li,Can Li
标识
DOI:10.1002/adma.202211182
摘要
Photocatalytic water splitting for solar energy conversion remains challenged by the lack of novel semiconductor photocatalysts with paramount parameters including wide light-harvesting ranges and suitable band structures. Here, a novel triclinic-phase bismuth chromate (Bi2CrO6) acting as a semiconductor photocatalyst candidate is reported. Triclinic Bi2CrO6 exhibits a broad absorption range of ≈650 nm with a direct bandgap of 1.86 eV and shows a suitable band structure for water splitting. Theoretical simulations of triclinic Bi2CrO6 reveal a high charge mobility, possibly owing to the strong hybridized covalent bonds, large elastic modulus, and small carrier effective mass. The triclinic Bi2CrO6 is demonstrated to work well toward photocatalytic water oxidation and hydrogen production reactions under visible light and match well with its absorption ranges. In particular, it exhibits decent photocatalytic water oxidation performance in the presence of various electron scavengers. Furthermore, the visible-light-driven Z-scheme overall water splitting system is fabricated by coupling triclinic Bi2CrO6 as the oxygen evolution photocatalyst with SrTiO3:Rh as the hydrogen evolution photocatalyst, giving a stable overall water splitting with stoichiometric evolution of H2 and O2. This work presents a promising semiconductor material enabling wide-range light harvesting for photocatalytic and photo-electrochemical solar energy conversion.
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