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首页> 外文期刊>Catalysis science & technology >Z-Scheme in a Co-3(PO4)(2)/alpha-Fe2O3 photocatalysis system for overall water splitting under visible light
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Z-Scheme in a Co-3(PO4)(2)/alpha-Fe2O3 photocatalysis system for overall water splitting under visible light

机译：Z-Scheme Co-3 (PO4) (2) / alpha-Fe2O3光催化系统整体水分裂在可见光下

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摘要

Overall water splitting under solar irradiation with a semiconductor has long been investigated as an attractive pathway to convert solar energy into chemical energy in the form of H-2. However, using only a single semiconductor as a photocatalyst remains a great challenge. Designing Z-scheme systems is the most common method used for photocatalysis. We report a Z-scheme Co-3(PO4)(2)/alpha-Fe2O3 structure as an efficient photocatalyst for overall water splitting under visible light. The as-prepared Co-3(PO4)(2)/alpha-Fe2O3 photocatalyst shows excellent improvement in visible light absorption and photocatalytic efficiency for overall water splitting, in which Co-3(PO4)(2) and Fe2O3 act as H-2-evolving and O-2-evolving photocatalysts, respectively. By varying the amount of alpha-Fe2O3 in the photocatalysts, we found that Co-3(PO4)(2)/alpha-Fe2O3-1.6% exhibited the optimal photocatalytic activity in hydrogen production (0.63 mu mol h(-1)) and oxygen evolution (0.32 mu mol h(-1)), which is almost 35-fold higher than that of a pure Co-3(PO4)(2) catalyst. In addition, the chemical stoichiometric ratio of H-2 and O-2 in the photocatalysis process is almost 2:1. The enhanced photocatalytic activity was attributed to the synergetic effects of Co-3(PO4)(2) and alpha-Fe2O3 in the Z-scheme structure, which resulted in highly efficient separation of photogenerated charge carriers.
机译：整体水太阳能照射下分解与半导体一直调查作为一个有吸引力的途径将太阳能到化学能的形式2。只使用一个单一的半导体作为光催化剂仍然是一个巨大的挑战。设计Z-scheme系统是最常见的方法用于光催化。Z-scheme Co-3 (PO4) (2) / alpha-Fe2O3结构作为一个高效的光催化剂总体水分裂下可见光。Co-3 (PO4) (2) / alpha-Fe2O3光催化剂优秀的可见光吸收的改善光催化效率整体水分裂,Co-3 (PO4)(2)和Fe2O3充当H-2-evolving和O-2-evolving催化剂,分别。alpha-Fe2O3催化剂,我们发现Co-3 (PO4)(2) /α- fe2o3 - 1.6%的展出最佳的催化活性氢生产(0.63μ摩尔h(1))和氧气进化(0.32μ摩尔h(1)),这几乎是35-fold高于纯Co-3 (PO4) (2)催化剂。化学计量比2和0 2光催化过程几乎是2:1。增强的催化活性是由于的协同效应Co-3 (PO4) (2)alpha-Fe2O3 Z-scheme结构,导致高效分离photogenerated运营商收费。

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