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The highly efficient photocatalytic water splitting to produce clean energyrequires novel semiconductor materials to achieve high solar-to-hydrogen energyconversion efficiency. Herein, the photocatalytic properties of anisotropic$\beta$-PtX$_2$ (X=S, Se) and Janus $\beta$-PtSSe monolayers are investigatedbased on density functional theory. Small cleavage energy for \{beta}-PtS2(0.44 J/m2) and $\beta$-PtSe$_2$ (0.40 J/m$^2$) endorses the possibility oftheir mechanical exfoliation from respective layered bulk material. Thecalculated results find \{beta}-PtX2 monolayers to have an appropriate bandgap(~1.8-2.6 eV) enclosing the water redox potential, light absorptioncoefficients (~104 cm$^{-1}$), and excitons binding energy (~0.5-0.7 eV), whichfacilitates excellent visible-light driven photocatalytic performance.Remarkably, an inherent structural anisotropy leads to the anisotropic and highcarrier mobility (up to ~5 x 10$^3$ cm$^2$ V$^{-1}$ S$^{-1}$) leading to fasttransport of photogenerated carriers. Notably, the small required externalpotential to derive hydrogen evolution reaction and oxygen evolution reactionprocesses with an excellent solar-to-hydrogen energy conversion efficiency of$\beta$-PtSe$_2$ (~16%) and $\beta$-PtSSe (~18%) makes them promisingcandidates for solar water splitting applications.

Photocatalytic Properties of Anisotropic $\beta$-PtX$_2$ (X= S, Se) and Janus $\beta$-PtSSe monolayers