Photoelectrochemical Response of Tin Iodide Phosphide (SnIP) Composites with MoSe₂, MoS₂, and h-BN

For a future world fuelled by green energy it is invaluable to develop, test and maximise the catalytic efficiency of new effective water-splitting materials. In this paper, we further explore the catalytic activity of double-helical tin iodide phosphide (SnIP), as it features bandgaps in the ideal region for this process. We found that its photoelectrochemical response can be multiplied by forming composites of SnIP with selected 2D materials, focusing on hexagonal boron nitride and the transition metal dichalcogenides (TMDs) MoSe₂ and MoS₂. These nanocomposites were analysed with Powder-X-ray diffraction (P-XRD), Raman, and UV/VIS bandgap determination. Their photo activity was assessed under simulated solar light through chrono amperometry and linear sweep voltammetry (CA, LSV). The high anisotropy of the involved materials enables efficient charge separation at the 1D/2D interfaces, increasing photoelectrochemical response four-fold.