In Situ Growth of the Bi2S3 Nanowire Array on the Bi2MoO6 Film for an Improved Photoelectrochemical Performance

A single-crystalline Bi 2 S 3 nanowire array (Bi 2 S 3 NWA) is synthesized by an in situ hydrothermal reaction on the surface of a Bi 2 MoO 6 film. As no additional source of Bi 3+ is provided during the process, the Bi 2 MoO 6 layer acts as the Bi 3+ source for the synthesis of Bi 2 S 3 nanowires. The fabricated Bi 2 MoO 6 /Bi 2 S 3 NWA 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 Bi 2 S 3 electrodes. The generated electron from the Bi 2 S 3 conduction band rapidly transfers to that of Bi 2 MoO 6 , yielding an enhanced electron separation of Bi 2 S 3 . Furthermore, the single-crystalline Bi 2 S 3 nanowire can provide a fast electron pathway to Bi 2 MoO 6 through its single domain, which also contributes to the improved PEC activity.