Abstract
Among the currently multitudinous analytical methods for hydrogen peroxide (H2O2), photoelectrochemical (PEC) sensors stand out for their potential advantages of high sensitivity, low cost, and easy preparation. In this work, WO3/Mo:BiVO4 heterojunction photoanode was constructed for non-enzymatic H2O2 sensing via PEC route. At first, WO3 nanoplates was prepared by chemical bath method, then WO3/Mo:BiVO4 composite was achieved by spin coating Mo:BiVO4 film on the surface of WO3. Such heterojunction structure allow photogenerated electrons transferred into WO3 and holes accumulated on Mo:BiVO4, which boosts the charges separation and decreases charge carrier recombination, thus resulting a remarkable enhancement for H2O2 sensing. As a result, the WO3/Mo:BiVO4 photoanode presents a sensitive response of 186.2 μA cm−2 mM−1 for H2O2 detection in the concentration region of 0.1-2.0 mM accompanied with a good correlation coefficient of 0.996, this sensing performance is much superior than the pristine WO3 photoanode. Furthermore, the fabricated heterojunction sensor has a good stability and distinguish H2O2 from the interferents of ascorbic acid (AA), uric acid (UA), glucose and common inorganic salts, etc. This study provides an efficient way for H2O2 detection and inspires more interests in the design and construction of a novel heterojunction for advanced PEC analysis.
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