Enhanced Charge Separation through ALD‐Modified Fe2O3/Fe2TiO5 Nanorod Heterojunction for Photoelectrochemical Water Oxidation

Chengcheng Li; Tuo Wang; Zhibin Luo; Shanshan Liu

doi:10.1002/smll.201600940

journal article May 19, 2016

Enhanced Charge Separation through ALD‐Modified Fe2O3/Fe2TiO5 Nanorod Heterojunction for Photoelectrochemical Water Oxidation

Chengcheng Li

Tuo Wang

Zhibin Luo Shanshan Liu

Small Vol. 12 No. 25 pp. 3415-3422 · Wiley

View at Publisher Save 10.1002/smll.201600940

Abstract

Hematite suffers from poor charge transport and separation properties for solar water splitting. This paper describes the design and fabrication of a 3D Fe2O3/Fe2TiO5 heterojunction photoanode with improved charge separation, via a facile hydrothermal method followed by atomic layer deposition and air annealing. A highly crystallized Fe2TiO5 phase forms with a distinct interface with the underlying Fe2O3 core, where a 4 nm Fe2TiO5 overlayer leads to the best photoelectrochemical performance. The favorable band offset between Fe2O3 and Fe2TiO5 establishes a type‐II heterojunction at the Fe2O3/Fe2TiO5 interface, which drives electron–hole separation effectively. The Fe2O3/Fe2TiO5 composite electrode exhibits a dramatically improved photocurrent of 1.63 mA cm−2 at 1.23 V versus reversible hydrogen electrode (RHE) under simulated 1 sun illumination (100 mW cm−2), which is 3.5 times that of the bare Fe2O3 electrode. Decorating the Fe2O3/Fe2TiO5 heterojunction photoanode with earth‐abundant FeNiOx cocatalyst further expedites surface reaction kinetics, leading to an onset potential of 0.8 V versus RHE with a photocurrent of 2.7 mA cm−2 at 1.23 V and 4.6 mA cm−2 at 1.6 V versus RHE. This sandwich photoanode shows an excellent stability for 5 h and achieves an overall Faradaic efficiency of 95% for O2 generation. This is the best performance ever reported for Fe2O3/Fe2TiO5 photoanodes.

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Citations

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References

Details

Published: May 19, 2016
Vol/Issue: 12(25)
Pages: 3415-3422
License: View

Authors

C

Chengcheng Li

Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and Technology Tianjin University Tianjin 300072 P. R. China; Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300072 P. R. China

T

Tuo Wang

Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and Technology Tianjin University Tianjin 300072 P. R. China; Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300072 P. R. China

Z

Zhibin Luo

Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and Technology Tianjin University Tianjin 300072 P. R. China; Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300072 P. R. China

S

Shanshan Liu

Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and Technology Tianjin University Tianjin 300072 P. R. China; Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300072 P. R. China

Funding

National Natural Science Foundation of China Award: 21525626

Natural Science Foundation of Tianjin City Award: 13JCYBJC37000

Cite This Article

Chengcheng Li, Tuo Wang, Zhibin Luo, et al. (2016). Enhanced Charge Separation through ALD‐Modified Fe2O3/Fe2TiO5 Nanorod Heterojunction for Photoelectrochemical Water Oxidation. Small, 12(25), 3415-3422. https://doi.org/10.1002/smll.201600940

Enhanced Charge Separation through ALD‐Modified Fe2O3/Fe2TiO5 Nanorod Heterojunction for Photoelectrochemical Water Oxidation

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