Revealing long-lived electron-hole migration in core-shell alpha/gamma-Fe2O3/FCP for efficient photoelectrochemical water oxidation

doi:10.1039/d1cy01628h

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	Revealing long-lived electron-hole migration in core-shell alpha/gamma-Fe2O3/FCP for efficient photoelectrochemical water oxidation
	Y. Y. Li; Y. F. Chen; Q. N. Wu; R. Zhang; M. J. Li; Y. H. Lin; D. J. Wang and T. F. Xie
	2022
Source Publication	Catalysis Science & Technology
ISSN	2044-4753
Volume	12 Issue:1 Pages:250-258
Abstract	The oxygen evolution reaction (OER) of Fe2O3 is limited by its low photocarrier separation efficiency in photoelectrochemical (PEC) water splitting. How to construct an effective photocarrier transmission route in Fe2O3 has become an important bottleneck for enhancing OER performance. Herein, we exploit a core-shell nanorod structure loaded with FeCo Prussian blue (FCP) to boost the water oxidation kinetics and charge transfer efficiency for the first time. As expected, the optimal gamma-Fe2O3/alpha-Fe2O3 photoanode exhibits a remarkable photocurrent density of 2.4 mA cm(-2) at 1.23 V vs. RHE; when a cocatalyst FCP is introduced as a hole-transport layer, it shows a photocurrent density of 3.5 mA cm(-2) at 1.23 V vs. RHE, which is 8.7 times higher than that of the pure alpha-Fe2O3. The outstanding photochemical performance could be attributed to the highest separation efficiency. A further study on the carrier lifetime was performed and clarified that the photocarrier lifetime of the gamma-Fe2O3/alpha-Fe2O3/FCP photoanode is prolonged (similar to 50.64 ps) as compared to that of the pure alpha-Fe2O3 photoanode (similar to 21.00 ps) using femtosecond time-resolved absorption spectroscopy (fs-TAS). This work successfully explains the photocatalytic water oxidation mechanism in the gamma-Fe2O3/alpha-Fe2O3/FCP photoanode and provides an effective insight into designing a photocarrier delivery channel for the outstanding water oxidation.
DOI	10.1039/d1cy01628h
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Indexed By	SCI
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Document Type	期刊论文
Identifier	http://ir.ciomp.ac.cn/handle/181722/65602
Collection	中国科学院长春光学精密机械与物理研究所
Recommended Citation GB/T 7714	Y. Y. Li,Y. F. Chen,Q. N. Wu,et al. Revealing long-lived electron-hole migration in core-shell alpha/gamma-Fe2O3/FCP for efficient photoelectrochemical water oxidation[J]. Catalysis Science & Technology,2022,12(1):250-258.
APA	Y. Y. Li.,Y. F. Chen.,Q. N. Wu.,R. Zhang.,M. J. Li.,...&D. J. Wang and T. F. Xie.(2022).Revealing long-lived electron-hole migration in core-shell alpha/gamma-Fe2O3/FCP for efficient photoelectrochemical water oxidation.Catalysis Science & Technology,12(1),250-258.
MLA	Y. Y. Li,et al."Revealing long-lived electron-hole migration in core-shell alpha/gamma-Fe2O3/FCP for efficient photoelectrochemical water oxidation".Catalysis Science & Technology 12.1(2022):250-258.

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中国科学院长春光学精密机械与物理研究所