| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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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 |
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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.
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Received: 27 May 2020
Revised: 16 July 2020
Accepted manuscript online: 28 July 2020
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PACS:
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78.40.Fy
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(Semiconductors)
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78.56.-a
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(Photoconduction and photovoltaic effects)
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| Fund: 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). |
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Corresponding Authors:
†Corresponding author. E-mail: lichaojia@snnu.edu.cn ‡Corresponding author. E-mail: hbfan@nwu.edu.cn
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Cite this article:
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 2020 Chin. Phys. B 29 127801
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