Abstract
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.