Jamdagni P, Kumar A, Srivastava S, Pandey R, Tankeshwar K. Photocatalytic properties of anisotropic β-PtX
2 (X = S, Se) and Janus β-PtSSe monolayers.
Phys Chem Chem Phys 2022;
24:22289-22297. [PMID:
36098214 DOI:
10.1039/d2cp02549c]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The highly efficient photocatalytic water splitting process to produce clean energy requires novel semiconductor materials to achieve a high solar-to-hydrogen energy conversion efficiency. Herein, the photocatalytic properties of anisotropic β-PtX2 (X = S, Se) and Janus β-PtSSe monolayers were investigated based on the density functional theory. The small cleavage energy for β-PtS2 (0.44 J m-2) and β-PtSe2 (0.40 J m-2) endorses the possibility of mechanical exfoliation from their respective layered bulk materials. The calculated results revealed that the β-PtX2 monolayers have an appropriate bandgap (∼1.8-2.6 eV) enclosing the water redox potential, light absorption coefficient (∼104 cm-1), and exciton binding energy (∼0.5-0.7 eV), which facilitates excellent visible-light-driven photocatalytic performance. Remarkably, the inherent structural anisotropy leads to an anisotropic high carrier mobility (up to ∼5 × 103 cm2 V-1 S-1), leading to a fast transport of photogenerated carriers. Notably, the required small external potential to realize hydrogen evolution reaction and oxygen evolution reaction processes with an excellent solar-to-hydrogen energy conversion efficiency for β-PtSe2 (∼16%) and β-PtSSe (∼18%) makes them promising candidates for solar water splitting applications.
Collapse