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Updated: May 17, 2025

Bimolecular Fluorescence Complementation
Published on: April 15, 2011
Establishing Donor-Acceptor Channel on BiVO4 Photoanode via Conjugated Polytrianiline Framework Enables Efficient
Zhaoshi Yu1, Jianqiao Zhao1, Shujie Liu1
1Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, Hubei, 430074, P. R. China.
Abstract:
The establishment of charge transfer channels on BiVO4 photoanodes is a feasible strategy to achieve effective hole extraction and improve photoelectrochemical performance. Here, a conjugated polytrianiline framework (CPF-TTPATA) is proposed as a hole transport layer between the NiFeOx catalyst and the Mo:BiVO4 light absorber to improve the charge separation efficiency. The CPF-TTPATA features an acceptor triazine moiety linked by a donor triphenylamine moiety to accelerate the delocalization of photogenerated charges and possesses suitable band alignment with Mo:BiVO4 to form a staggered type-II heterojunction that facilitates hole extraction. Meanwhile, CPF-TTPATA passivates the surface trap states of Mo:BiVO4, which promotes the interfacial charge transfer between Mo:BiVO4 and CPF-TTPATA. Therefore, the effective separation of photogenerated charge in our carefully designed Bi3+-acceptor-donor-catalyst conductive channel can be realized. The as-prepared NiFeOx/CPF-TTPATA/Mo:BiVO4 photoanode exhibits an extremely high photocurrent density of 6.94 mA cm-2 and charge separation efficiency (≈100%) at 1.23 V (vs. RHE) under simulated AM 1.5G sunlight (100 mW cm-2). This work provides new insights for the design of organic and inorganic hybrid photoanodes for high-performance solar water splitting applications.
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