Covalent bonding mediated interfacial charge transfer between BiVO<sub>4</sub> and {Co<sub>4</sub>O<sub>4</sub>} cubanes for enhanced photoelectrochemical water splitting
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Author (Corporation)
Publication date
15.10.2025
Type of student thesis
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Type
01A - Journal article
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Parent work
Advanced Functional Materials
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Pages / Duration
e23057
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Publisher / Publishing institution
Wiley
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Abstract
Although molecular cocatalysts (MCs) have demonstrated significant application potential for photoelectrochemical (PEC) water splitting, the immobilization and stabilization of them for long-term application remains challenging. Herein, an integrated photoanode (BiVO4@NM88B(Fe)/Co4O4) is developed by immobilizing Co4O4 cubanes onto NH2-MIL-88B(Fe) (NM88B(Fe)) decorated BiVO4 via site-isolation strategy. The unoccupied coordination sites in NM88B(Fe) covalently bound to both Co4O4 and BiVO4, which significantly decreases the interfacial charge transfer resistance of BiVO4@NM88B(Fe)/Co4O4 and achieve prolonged stability. More importantly, the oxygen evolution cocatalyst (OEC) NM88B(Fe)/Co4O4 remarkably lowered the energy barrier and thermodynamically favored surface water oxidation. Consequently, the photocurrent density of BiVO4@NM88B(Fe)/Co4O4 photoanode achieved up to 5.26 mA·cm−2 at 1.23 VRHE, which is 3.73 times higher than that of bare BiVO4. This work presents a site-isolation strategy to overcome molecular catalyst stabilization challenges in PEC systems while offering crucial insights into designing efficient charge transfer channels between OECs and semiconductors for enhanced water splitting performance.
Keywords
BiVO4@NM88B(Fe)/Co4O4 photoanodes, Metal organic frameworks, Molecular catalysts, Photoelectrochemical water splitting
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ISBN
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1616-301X
1616-3028
1616-3028
Language
English
Created during FHNW affiliation
Yes
Strategic action fields FHNW
Publication status
Published
Review
Peer review of the complete publication
Open access category
Closed
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Citation
Li, H., Hou, Z., Hu, Y., Wang, J., Li, A., & Corvini, P. (2025). Covalent bonding mediated interfacial charge transfer between BiVO<sub>4</sub> and {Co<sub>4</sub>O<sub>4</sub>} cubanes for enhanced photoelectrochemical water splitting. Advanced Functional Materials, e23057. https://doi.org/10.1002/adfm.202523057