期刊
DALTON TRANSACTIONS
卷 48, 期 4, 页码 1166-1170出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8dt03653e
关键词
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资金
- Knut and Alice Wallenbergs Foundation [KAW 2011.0055]
- Vetenskapsradet [2017-04862]
- Energimyndigheten [45419-1]
- Angpanneforeningen [15-483]
Herein, we communicate about an Earth-abundant semiconductor photocathode (p-Si/TiO2/NiOx) as an alternative for the rare and expensive Pt as a counter electrode for overall photoelectrochemical water splitting. The proposed photoelectrochemical (PEC) water-splitting device mimics the Z-scheme observed in natural photosynthesis by combining two photoelectrodes in a parallel-illumination mode. A nearly 60% increase in the photocurrent density (J(ph)) for pristine -Fe2O3 and a 77% increase in the applied bias photocurrent efficiency (ABPE) were achieved by replacing the conventionally used Pt cathode with an efficient, cost effective p-Si/TiO2/NiOx photocathode under parallel illumination. The resulting photocurrent density of 1.26 mA cm(-2) at 1.23V(RHE) represents a new record performance for hydrothermally grown pristine -Fe2O3 nanorod photoanodes in combination with a photocathode, which opens the prospect for further improvement by doping -Fe2O3 or by its decoration with co-catalysts. Electrochemical impedance spectroscopy measurements suggest that this significant performance increase is due to the enhancement of the space-charge field in -Fe2O3.
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