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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
发表期刊Catalysis Science & Technology
ISSN2044-4753
卷号12期号:1页码:250-258
摘要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.
DOI10.1039/d1cy01628h
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文献类型期刊论文
条目标识符http://ir.ciomp.ac.cn/handle/181722/65602
专题中国科学院长春光学精密机械与物理研究所
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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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