Abstract
The development of a portable photo-assisted self-powered sensing platform with high sensitivity and selectivity for the detection of low-abundance targets is attractive. Herein, a self-powered sensor with photo-assisted zinc−air battery as a energy conversion device was developed for sensitive detection of gallic acid. The proposed photo-assisted zinc−air battery was constructed based on a AgBr/CuBi2O4 Z-scheme heterojunction with high open circuit voltage (OCV). The outstanding OCV signal benefits from the separation of electron hole pairs promoted by the Z-scheme heterojunction, which improves the photoelectric conversion efficiency. More importantly, the high redox potential of the Z-scheme heterostructure can provide sufficient driving force for photogenerated charge carriers to participate in oxygen reduction reaction, thereby realizing the co-conversion of solar and chemical energy. Furthermore, a novel signal-off detection strategy was developed based on the dual-inhibition effect of the steric hindrance and the consumption of dissolved oxygen. Notably, the chelating effect between AgBr/CuBi2O4 and the gallic acid enabled the selectivity of the as-fabricated sensor. The proposed self-powered sensor exhibits high sensitivity for detecting gallic acid and a good linearity range (1 µM ∼ 500 µM) with a low detection limit (0.87 µM), which provides a new prospective for antioxidants detection.
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