Construction of 1D/2D Sb2(S,Se)3/In2S3 S-Scheme Heterojunction Photoanodes toward Photoelectrochemical Water Splitting

Antimony sulfoselenide (Sb₂(S,Se)₃), a highly promising photovoltaic material, has garnered significant attention in solar cell applications. Sb₂(S,Se)₃ exhibits anisotropic carrier transport, with carrier mobility along the [hk1] direction being significantly higher than that along the [hk0] direction. In this work, [hk1]-oriented Sb₂(S,Se)₃ nanorods were epitaxially grown on 2D Bi₂O₂S nanosheets via a one-step hydrothermal method. Subsequently, an S-scheme heterojunction was constructed by integrating In₂S₃. This heterojunction not only compensates for the weak short-wavelength light absorption of the photoanode but also suppresses carrier recombination. Achieving 6.05 mA cm^–2 at 1.23 V_RHE, the composite photoanode confirms enhanced PEC performance through efficient carrier utilization. This work develops a hydrothermal methodology to synthesize quasi-1D Sb₂(S,Se)₃ nanorods and construct 1D–2D Sb₂(S,Se)₃/In₂S₃ heterostructures.