Switchable Charge‐Transfer in the Photoelectrochemical Energy‐Conversion Process of Ferroelectric BiFeO3 Photoelectrodes |
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Authors: | Dr Dawei Cao Dr Zhijie Wang Nasori Liaoyong Wen Yan Mi Prof Yong Lei |
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Institution: | 1. Institut für Physik & IMN MacroNano@(ZIK), Technische Universit?t Ilmenau, 98693 Ilmenau (Germany);2. Institute of Nanochemistry and Nanobiology, Shanghai University, 200444 Shanghai (P. R. China) |
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Abstract: | Instead of conventional semiconductor photoelectrodes, herein, we focus on BiFeO3 ferroelectric photoelectrodes to break the limits imposed by common semiconductors. As a result of their prominent ferroelectric properties, the photoelectrodes are able to tune the transfer of photo‐excited charges generated either in BiFeO3 or the surface modifiers by manipulating the poling conditions of the ferroelectric domains. At 0 V vs Ag/AgCl, the photocurrent could be switched from 0 μA cm?2 to 10 μA cm?2 and the open‐circuit potential changes from 33 mV to 440 mV, when the poling bias of pretreatment is manipulated from ?8 V to +8 V. Additionally, the pronounced photocurrent from charge injection of the excited surface modifiers could be quenched by switching the poling bias from +8 V to ?8 V. |
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Keywords: | BiFeO3 charge transfer photoelectrodes polarization tunability |
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