In Situ Growth of the BiS Nanowire Array on the BiMoO Film for an Improved Photoelectrochemical Performance.

A single-crystalline BiS nanowire array (BiSNWA) is synthesized by an in situ hydrothermal reaction on the surface of a BiMoO film. As no additional source of Bi is provided during the process, the BiMoO layer acts as the Bi source for the synthesis of BiS nanowires. The fabricated BiMoO/BiSNWA electrode exhibited an increased photoelectrochemical (PEC) sulfite oxidation activity, which is attributed mainly to the effective interface obtained by the in situ hydrothermal growth, compared to other BiS electrodes. The generated electron from the BiS conduction band rapidly transfers to that of BiMoO, yielding an enhanced electron separation of BiS. Furthermore, the single-crystalline BiS nanowire can provide a fast electron pathway to BiMoO through its single domain, which also contributes to the improved PEC activity.