Improved water oxidation via Fe doping of CuWO4 photoanodes: Influence of the Fe source and concentration

doi:10.1088/1674-1056/aba9cb

中国物理B ›› 2020, Vol. 29 ›› Issue (12): 127801-.doi: 10.1088/1674-1056/aba9cb

收稿日期:2020-05-27 修回日期:2020-07-16 接受日期:2020-07-28 出版日期:2020-12-01 发布日期:2020-11-13

Improved water oxidation via Fe doping of CuWO₄ photoanodes: Influence of the Fe source and concentration

Yue Sun(孙岳)¹, Fenqi Du(杜粉琦)¹, Donghang Xie(谢东航)¹, Dongmei Yang(杨冬梅)¹, Yang Jiao(焦阳)¹, Lichao Jia(贾丽超)^2,†, and Haibo Fan(范海波)^1,‡

¹ School of Physics, Northwest University, Xi'an 710069, China; ² School of Material Science and Engineering, Shaanxi Normal University, Xi'an 710119, China

Received:2020-05-27 Revised:2020-07-16 Accepted:2020-07-28 Online:2020-12-01 Published:2020-11-13
Contact: ^†Corresponding author. E-mail: lichaojia@snnu.edu.cn ^‡Corresponding author. E-mail: hbfan@nwu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11204238) and the Natural Science Foundation of Shaanxi Province, China (Grant No. 2017JM1030).

摘要/Abstract

Abstract: Iron (Fe) was successfully doped in CuWO₄ photoanode films with a combined liquid-phase spin-coating method via the dopant sources of Fe(NO₃)₃, FeSO₄ and FeCl₃. The microstructure of the prepared films was characterized by x-ray diffraction, scanning electron microscopy, and atomic force microscopy. The light absorption and photoelectric conversion properties were evaluated by the UV-visible absorption spectra and monochromatic incident photon-to-electron conversion efficiency. The chemical composition and element combination of the samples were examined by x-ray photoelectron spectroscopy. A linear sweep voltammetric and stability test (I-t) were performed with an electrochemical workstation. The results show that the samples are uniform with a thickness of approximately 800 nm and that the photoelectrochemical performance of the doped films is heavily dependent on the Fe source and dopant concentration. Upon optimizing the doping conditions of Fe(NO₃)₃ and the optimal source, the photocurrent density in the Fe-doped CuWO₄ photoanode film is improved by 78% from 0.267 mA/cm² to 0.476 mA/cm² at 1.23 V vs reversible hydrogen electrode. The underlying causes are discussed.

Key words: photoanode thin film, liquid phase method, CuWO₄, Fe doping

中图分类号: (Semiconductors)

78.40.Fy

78.56.-a (Photoconduction and photovoltaic effects)

. [J]. 中国物理B, 2020, 29(12): 127801-.

Yue Sun(孙岳), Fenqi Du(杜粉琦), Donghang Xie(谢东航), Dongmei Yang(杨冬梅), Yang Jiao(焦阳), Lichao Jia(贾丽超), and Haibo Fan(范海波). Improved water oxidation via Fe doping of CuWO₄ photoanodes: Influence of the Fe source and concentration[J]. Chin. Phys. B, 2020, 29(12): 127801-.

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Improved water oxidation via Fe doping of CuWO₄ photoanodes: Influence of the Fe source and concentration

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