ZnO photoelectrode simultaneously modified with Cu2O and Co-Pi based on broader light absorption and efficiently photogenerated carrier separation†,Inorganic Chemistry Frontiers

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ZnO photoelectrode simultaneously modified with Cu2O and Co-Pi based on broader light absorption and efficiently photogenerated carrier separation†
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2018-08-29 00:00:00 , DOI: 10.1039/c8qi00596f
Chonghao Ma _{1,

2,

3,

4,

5} , Zhifeng Liu _{1,

2,

3,

4,

5} , Qijun Cai _{1,

2,

3,

4,

5} , Changcun Han _{1,

2,

3,

4,

5} , Zhengfu Tong _{1,

2,

3,

4,

5}

Affiliation

Expanding the optical response range and improving the photogenerated carrier separation rate are critical to increasing the efficiency of photoelectrochemical (PEC) water splitting. In this paper, a ZnO/Cu₂O/Co-Pi heterojunction was successfully fabricated for photoelectrochemical (PEC) water splitting. As a narrow band semiconductor, Cu₂O can extend the absorption range of solar spectra. Co-Pi plays the role of a hole-trapping cocatalyst to accelerate the water oxidation reaction at the electrode and electrolyte interfaces. This complex ZnO/Cu₂O/Co-Pi photoanode moves the origin potential in a negative direction, and displays an improved photocurrent density of 1.58 mA cm⁻² at 1.23 V vs. RHE, which is 1.08 times that of a ZnO/Cu₂O heterojunction and 2.03 times that of pure ZnO. The efficient PEC performances of the ZnO/Cu₂O/Co-Pi photoanode are caused by the broader light absorption and higher photogenerated carrier separation rate. This study proved that the simultaneous reaction of the heterojunction and cocatalyst has great prospects for application in efficient photoelectrochemical (PEC) water splitting photoelectrode systems.

中文翻译：

ZnO光电极同时被Cu ₂ O和Co-Pi修饰，具有更宽的吸光度和有效的光生载流子分离能力†

扩大光学响应范围并提高光生载流子分离速率对于提高光化学（PEC）水分解效率至关重要。本文成功地制备了ZnO / Cu ₂ O / Co-Pi异质结，用于光电化学（PEC）水分解。作为一种窄带半导体，Cu ₂ O可以扩展太阳光谱的吸收范围。Co-Pi充当空穴捕获助催化剂的角色，以加速电极和电解质界面处的水氧化反应。这种复杂的ZnO / Cu ₂ O / Co-Pi光电阳极在负方向上移动原电位，并在1.23 V vs. 1的条件下显示出1.58 mA cm ^-2的改进光电流密度。。RHE是ZnO / Cu ₂ O异质结的1.08倍，是纯ZnO的2.03倍。ZnO / Cu ₂ O / Co-Pi光电阳极的有效PEC性能是由于更宽的光吸收和更高的光生载流子分离率所致。这项研究证明，异质结和助催化剂的同时反应在高效的光电化学（PEC）水分解光电极系统中具有广阔的应用前景。

更新日期：2018-08-29

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