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首页> 外文期刊>Physical chemistry chemical physics: PCCP >Effects of Zn~(2+) and Pb~(2+) dopants on the activity of Ga2O3-based photocatalysts for water splitting
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Effects of Zn~(2+) and Pb~(2+) dopants on the activity of Ga2O3-based photocatalysts for water splitting

机译：Zn〜（2+）和Pb〜（2+）掺杂剂对水分裂Ga2O3光催化剂活性的影响

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摘要

Zn-doped and Pb-doped β-Ga2O3-based photocatalysts were prepared by an impregnation method. The photocatalyst based on the Zn-doped p-Ga2O3 shows a greatly enhanced activity in water splitting while the Pb-doped p-Ga2O3 one shows a dramatic decrease in activity. The effects of Zn~(2+) and Pb~(2+) dopants on the activity of Ga2O3-based photocatalysts for water splitting were investigated by HRTEM, XPS and time-resolved IR spectroscopy. A ZnGa2O4-p-Ga2O3 heterojunction is formed in the surface region of the Zn-doped p-Ga2O3 and a slower decay of photogenerated electrons is observed. The ZnGa2O4-β-Ga2O3 heterojunction exhibits type-ll band alignment and facilitates charge separation, thus leading to an enhanced photocatalytic activity for water splitting. Unlike Zn~(2+) ions, Pb~(2+) ions are coordinated by oxygen atoms to form polyhedra as dopants, resulting in distorted surface structure and fast decay of photogenerated electrons of β-Ga2O3. These results suggest that the Pb dopants act as charge recombination centers expediting the recombination of photogenerated electrons and holes, thus decreasing the photocatalytic activity.
机译：通过浸渍方法制备Zn掺杂和Pb掺杂的β-GA2O3的光催化剂。基于Zn掺杂的P-Ga 2 O 3的光催化剂显示出水分裂中的大大增强活性，而PB掺杂的P-GA2O3人显示出剧烈的活性降低。通过HRTEM，XPS和时间分辨的IR光谱研究了Zn〜（2+）和Pb〜（2+）掺杂剂对水分裂的Ga2O3的光催化剂的活性的影响。在Zn掺杂P-GA2O3的表面区域中形成Znga2O4-P-Ga2O3异质结，并且观察到光生电子的较慢衰减。 Znga2O4-β-Ga2O3异质结具有型式LL带对准，并促进电荷分离，从而导致用于水分裂的增强的光催化活性。与Zn〜（2+）离子不同，Pb〜（2+）离子由氧原子配位，形成多孔作为掺杂剂，导致β-Ga2O3的光生电子的表面结构和快速衰减。这些结果表明，PB掺杂剂作为加速光透镜电子和孔的重组的电荷重组中心，从而降低光催化活性。

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    Xiang Wang; Shuai Shen; Shaoqing Jin;

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    State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian National Laboratory for Clean Energy 457 Zhongshan Road Dalian 116023 China;

    State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian National Laboratory for Clean Energy 457 Zhongshan Road Dalian 116023 China;

    State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian National Laboratory for Clean Energy 457 Zhongshan Road Dalian 116023 China;

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  • 正文语种 eng
  • 中图分类 物理学;化学;
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