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Earth-abundant and ecofriendly minerals SnS x Se1–x can be promising candidates for photoelectrochemical (PEC) cells because of their tunable band gaps and high absorption efficiency. Metal nanoparticle-modified SnS x Se1–x enhance the efficiencies of solar energy water splitting. In this paper, SnS x Se1–x nanosheets (NSs) were prepared by a one-pot method and silver (Ag) nanoparticles were deposited on the surface of SnS x Se1–x NSs through a photochemical reduction process. The structural properties of SnS x Se1–x and SnS x Se1–x /Ag NSs were characterized by X-ray diffraction (XRD) and Raman spectroscopy. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to characterize the morphologies of SnS x Se1–x and SnS x Se1–x /Ag NSs. The band gaps of SnS x Se1–x and SnS x Se1–x /Ag NSs were determined using the UV–Vis–NIR spectra. PEC measurements indicated that the photocurrents of SnS x Se1–x thin films increased first and then decreased with the increase of Se. The SnS0.5Se0.5 thin films had the best PEC properties. The modification of Ag nanoparticles enhanced the PEC properties of SnS x Se1–x NSs. The highest photocurrent density of 69.3 μA/cm2 and the incident monochromatic photon-to-electron conversion efficiency (IPCE) of 27.9% were obtained.

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