Z-Scheme in a Co3(PO4)2/α-Fe2O3 photocatalysis system for overall water splitting under visible light†,Catalysis Science & Technology

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Z-Scheme in a Co3(PO4)2/α-Fe2O3 photocatalysis system for overall water splitting under visible light†
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2017-12-28 00:00:00 , DOI: 10.1039/c7cy02323e
Mumei Han _{1,

2,

3,

4,

5} , Lulu Hu _{1,

2,

3,

4,

5} , Yunjie Zhou _{1,

2,

3,

4,

5} , Siqi Zhao _{1,

2,

3,

4,

5} , Liang Bai _{1,

2,

3,

4,

5} , Yue Sun _{1,

2,

3,

4,

5} , Hui Huang _{1,

2,

3,

4,

5} , Yang Liu _{1,

2,

3,

4,

5} , Zhenhui Kang _{1,

2,

3,

4,

5}

Affiliation

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 H₂. 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 Co₃(PO₄)₂/α-Fe₂O₃ structure as an efficient photocatalyst for overall water splitting under visible light. The as-prepared Co₃(PO₄)₂/α-Fe₂O₃ photocatalyst shows excellent improvement in visible light absorption and photocatalytic efficiency for overall water splitting, in which Co₃(PO₄)₂ and Fe₂O₃ act as H₂-evolving and O₂-evolving photocatalysts, respectively. By varying the amount of α-Fe₂O₃ in the photocatalysts, we found that Co₃(PO₄)₂/α-Fe₂O₃-1.6% exhibited the optimal photocatalytic activity in hydrogen production (0.63 μmol h⁻¹) and oxygen evolution (0.32 μmol h⁻¹), which is almost 35-fold higher than that of a pure Co₃(PO₄)₂ catalyst. In addition, the chemical stoichiometric ratio of H₂ and O₂ in the photocatalysis process is almost 2 : 1. The enhanced photocatalytic activity was attributed to the synergetic effects of Co₃(PO₄)₂ and α-Fe₂O₃ in the Z-scheme structure, which resulted in highly efficient separation of photogenerated charge carriers.

中文翻译：

Z-方案中的共₃（PO ₄）₂ /的α-Fe ₂ ö ₃用于在可见光下整体水分解的光催化系统†

长期以来，人们一直在研究用半导体照射太阳下的总水，作为将太阳能转化为H ₂形式的化学能的诱人途径。然而，仅使用单个半导体作为光催化剂仍然是巨大的挑战。设计Z方案系统是用于光催化的最常用方法。我们报告的Z方案有限公司₃（PO ₄）₂ /的α-Fe ₂ ö ₃结构作为有效的光催化剂在可见光下整体水分解。所制备的钴₃（PO ₄）₂ /的α-Fe ₂ ö ₃光催化剂在整个水分解中显示出对可见光吸收和光催化效率的极大改善，其中Co ₃（PO ₄）₂和Fe ₂ O _3分别充当H ₂析出和O ₂析出光催化剂。通过改变的量的α-Fe ₂ Ó ₃在光催化剂，我们发现，联合₃（PO ₄）₂ /的α-Fe ₂ ö ₃ -1.6％氢气生产表现出最佳的光催化活性（0.63微摩尔ħ ^-1）和氧气析出（0.32μmolh ^-1），几乎是纯Co ₃（PO ₄）₂催化剂的35倍。此外，H的化学计量比₂和O ₂在光催化过程中几乎2：1.增强的光催化活性是由于Co的协同效果₃（PO ₄）₂和的α-Fe ₂ Ó ₃在Z方案结构，可高效分离光生电荷载流子。

更新日期：2017-12-28

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