Abstract
The performances of photoelectrochemical (PEC) sensors mainly depend on the physical/chemical properties of photoactive materials. Therefore, the preparation of semiconductors with strong light absorption capacity, high photoelectric conversion efficiency, effective carrier separation and good light stability, has received much interest in the field of PEC sensing. As bismuth oxyhalides (BiOX, X = Cl, Br, I)-based photocatalysts present wider light absorption range, adjustable band gap and good light stability, they have been widely studied and applied in PEC sensing. This paper reviews the functionalization methods of BiOX and highlights the impact of functionalization on their morphology, composition, structure and properties. Importantly, the sensing strategies of BiOX-based functional materials in photoanodic and photocathodic sensing are systematically summarized. Finally, the challenges and opportunities for the BiOX-based PEC sensors are prospected.
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