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Solvent-driven interface-facet synergy in TiO2/Bi2MoO6 heterojunctions for dual-functional catalysis
Shuzhe Zhang, Gang Chen, He Wang, Peng Chen*, Yanhua Song*, Haifeng Zou*
https://doi.org/10.1016/j.cjsc.2026.101054
Solvent engineering; Heterojunction photocatalysts; Charge carrier dynamics; Bifunctional catalysis.
ABSTRACT
The kinetics of interfacial reactions and charge carrier transport govern the photocatalytic performance of semiconductor materials. Nevertheless, conventional synthetic approaches frequently neglect the critical influence of solvent systems on these fundamental processes and their underlying mechanism. Herein, a breakthrough in photocatalyst was presented through an innovative N-methyl-2-pyrrolidone (NMP)-ethylene glycol (EG) mixed-solvent thermal approach, which enabled the successful fabrication of TiO2/Bi2MoO6 heterojunctions with unprecedented yarn-ball structures. Elucidated through detailed characterization, the solvent acted as a director, controlling ion diffusion kinetics to simultaneously promote defect formation and multi-faceted exposure. Furthermore, femtosecond transient absorption spectroscopy (fs-TAS) revealed that a synergy between the multiple crystal planes and the interfacial electric field in the unique structure optimized charge separation dynamics, and enhanced surface reaction kinetics, thus leading to a significant improvement in photocatalytic efficiency. Surprisingly, the heterojunction material demonstrated exceptional oxidase-mimicking activity and enhanced photocatalytic reduction performance. It achieved a low detection limit of 57 nM for Cr(VI) and, remarkably, enabled rapid photocatalytic reduction of 94.2% of Cr(VI) within just 6 min without requiring pH adjustment or sacrificial agents. This work provided design guidelines for multifunctional photocatalysts via solvent-mediated approaches.
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CN 35–1112/TQ, ISSN 0254–5861, Online ISSN: 2949-768X Copyright @ 2022 Chinese Journal of Structural Chemistry-www.Chinese Journal of Structural Chemistry.net. All Rights Reserved 闽ICP备2022002645号-1