Controlling the density of storable charge of surface faradaic layers on Fe 2 O 3 photoanodes for solar rechargeable devices

Interface charge transfer plays a key role in a photoelectrochemical cell. Recently, a faradaic junction transfer model was proposed that describes the interface charge transfer process. Electrochemical potential is introduced as a thermodynamic descriptor for the structure and composition of the su...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2023-02, Vol.11 (8), p.4030-4036
Main Authors: Jiang, Dongjian, Sun, Xiao, Xue, Mengfan, Wang, Pin, Yao, Yingfang, Luo, Wenjun, Zou, Zhigang
Format: Article
Language:English
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Summary:Interface charge transfer plays a key role in a photoelectrochemical cell. Recently, a faradaic junction transfer model was proposed that describes the interface charge transfer process. Electrochemical potential is introduced as a thermodynamic descriptor for the structure and composition of the surface faradaic layer of a semiconductor. However, the kinetic process in the faradaic junction model remains unclear. Herein, we introduce a descriptor, the density of storable charge (DOSC), to describe the number of charges that can be stored in a surface faradaic layer at different applied potentials. Moreover, the DOSC of the faradaic layer on the surface of Fe 2 O 3 was modified by Ti doping, and the results suggest that a larger DOSC leads to higher transient photocurrent in a solar rechargeable device, which is helpful for designing other high-performance devices for solar conversion and storage.
ISSN:2050-7488
2050-7496
DOI:10.1039/D2TA09340E