Boosting Photocatalytic Oxygen Evolution: Purposely Constructing Direct Z-Scheme Photoanode by Modulating the Interface Electric Field

doi:10.1007/s40242-020-0278-9

Chemical Research in Chinese Universities ›› 2020, Vol. 36 ›› Issue (6): 1059-1067.doi: 10.1007/s40242-020-0278-9

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Boosting Photocatalytic Oxygen Evolution: Purposely Constructing Direct Z-Scheme Photoanode by Modulating the Interface Electric Field

LI Yinyin¹, WU Qiannan², ZHANG Kai¹, HU Bin³, LIN Yanhong¹, WANG Dejun¹, XIE Tengfeng¹

1. Institute of Physical Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China;
2. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China;
3. College of Chemistry, Jilin University, Changchun 130012, P. R. China

Received:2020-09-01 Revised:2020-10-14 Online:2020-12-01 Published:2020-12-03
Contact: XIE Tengfeng E-mail:xietf@jlu.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(Nos.51572106, 21773086, 21872063).

Abstract

Abstract: Ti-Fe₂O₃ photoanode has received widespread attention in photoelectrochemical(PEC) water spilling because of its optimized oxidative and reductive capability of composites catalyst. However, its low efficiency could limit its development. Herein, in order to improve the efficiency of PEC water spilling, the all-solid-state direct Z-scheme Ti-ZnFe₂O₄/Ti-Fe₂O₃(TZFO/Ti-Fe₂O₃) nanorod arrays composited with the ideal energy band structure are synthesized by modulating the Fermi level of TZFO for PEC water splitting. The photophysical methods in this work, including the Kelvin probe measurement and transient photovoltage spectroscopy(TPV) measurement, are applied to explore the migration behavior of electric charges at the enhanced interface electric field. Finally, the Z-scheme charge transfer mechanism of TZFO/Ti-Fe₂O₃ photoanode is proved successfully. Benefiting from the desirable charge transfer at interface electric field, the TZFO/Ti-Fe₂O₃ exhibits the outstanding photocatalytic oxygen evolution reaction(OER) performance, and the photocurrent of 60TZFO/Ti-Fe₂O₃ photoanode reaches 2.16 mA/cm² at 1.23 V vs. reversible hydrogen electrode(RHE), which is three times higher than that of pure Ti-Fe₂O₃ photoanode. This work provides a facile approach of modulating interface electric field to optimize the Z-scheme charge-transfer process.

Key words: Ti-ZnFe₂O₃/Ti-Fe₂O₃, Z-Scheme, Interface electric field, Heterojunction photoanode

LI Yinyin, WU Qiannan, ZHANG Kai, HU Bin, LIN Yanhong, WANG Dejun, XIE Tengfeng. Boosting Photocatalytic Oxygen Evolution: Purposely Constructing Direct Z-Scheme Photoanode by Modulating the Interface Electric Field[J]. Chemical Research in Chinese Universities, 2020, 36(6): 1059-1067.

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Boosting Photocatalytic Oxygen Evolution: Purposely Constructing Direct Z-Scheme Photoanode by Modulating the Interface Electric Field

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