MWCNTs and MoS2-Sensitized BiVO4 Photoanode for Improved Hydrogen Peroxide and Hypochlorite Sensing

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Multi-walled carbon nanotube (MWCNT)-modified MoS2/BiVO4 was manufactured and used for the photoelectrochemical (PEC) detection of hydrogen peroxide (H2O2) and hypochlorite (ClO−). A solvothermal method was used to synthesize an MWCNT/MoS2/BiVO4 composite that showed perfect PEC properties because the MWCNTs and MoS2/BiVO4 heterostructures increased the composite’s stability against photocorrosion. Compared with the same signal of MWCNT/MoS2/BiVO4, the photocurrent signal of other composites was much smaller upon irradiation by visible light. According to this PEC sensor, the linear range of the H2O2 concentration was 1–200[Formula: see text][Formula: see text]M and 280–1560[Formula: see text][Formula: see text]M at [Formula: see text] based on the same pH when detecting ClO− concentrations between 0.5–10[Formula: see text][Formula: see text]M and 20–340[Formula: see text][Formula: see text]M in a bleach sample. As a result, this sensor can be used to detect reactive oxygen species (ROS) in practical samples.