A hydrogen sulfide photoelectrochemical sensor based on BiVO/FeO heterojunction.

A BiVO/FeO heterojunction for non-enzymatic photoelectrochemical (PEC) determination of hydrogen sulfide (HS) is reported. The BiVO/FeO heterojunction promoted the separation of photo-generated carriers, reduced electron-hole recombination, and thus improved electron collection and photocurrent. The proposed BiVO/FeO/FTO sensor exhibited a linear range of 1-500 μM and a detection limit of 0.51 nM HS. In addition, high selectivity, good reproducibility, and stability were obtained for HS sensing. The detection of HS in water and serum samples demonstrated its feasibility. This work provides a new strategy to detect and understand the bio-function of HS in the biological environment.