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.

在目前众多的过氧化氢（H ₂ O ₂）分析方法中，光电化学（PEC）传感器以其灵敏度高、成本低、制备简单等潜在优势脱颖而出。在这项工作中，构建了 WO ₃ /Mo:BiVO _{4异质结光电阳极，用于}通过PEC 途径进行非酶促 H ₂ O ₂感测。首先采用化学浴法制备WO ₃纳米片，然后通过在WO 3 表面旋涂Mo:BiVO 4 薄膜获得WO ₃ / _Mo : _BiVO 4_{复合材料。}. 这种异质结结构允许光生电子转移到WO ₃和空穴积累在Mo:BiVO ₄上，这促进了电荷分离并减少了电荷载流子复合，从而显着增强了H ₂ O ₂传感。因此，WO ₃ /Mo:BiVO ₄光电阳极在 0.1-2.0 mM 的浓度范围内对 H ₂ O ₂检测具有 186.2 μA cm ^-2 mM ^-1的灵敏响应，并具有 0.996 的良好相关系数，这种传感性能比原始 WO _{3优越得多}光电阳极。此外，制备的异质结传感器具有良好的稳定性，可将H ₂ O ₂与抗坏血酸（AA）、尿酸（UA）、葡萄糖和普通无机盐等干扰物区分开来。该研究为H ₂ O提供了一种有效的方法₂检测并激发人们对设计和构建用于高级 PEC 分析的新型异质结的更多兴趣。