Facile Synthesis of SnS and SnS2 Nanosheets for FTO/SnS/SnS2/Pt Photocathode

Two-dimensional (2D) materials have attracted great attention recently. SnS/SnS2 with sheet-like morphologies are widely used in photoelectric devices because of their excellent electronic transportation properties. In our study, by changing the mole ratios of SnCl2 and C2H5NS at reaction temperatures as high as 280–300 °C, SnS rectangular nanosheets are converted successfully to SnS2 hexagonal nanosheets with a one-pot method. SEM, XRD, Raman, and XPS analyses were utilized to examine the physical properties of the final products. Diffuse reflection spectra and PL spectra determined the bandgaps of SnS/SnS2 to be about 1.49 and 2.19 eV, respectively. The photoelectric characteristics of SnS/SnS2 nanosheets were also studied. FTO/SnS/SnS2/Pt photocathode was fabricated to enhance the photocurrent densities. Photocurrent densities as high as 26.7 μA/cm2 were achieved