▎ 摘　　要

In this study, the lanthanum sulfide-manganese sulfide (La2S3-MnS) nanosheet composite films with different thicknesses were grown on graphene oxide (GO) (LMS/GO) coated stainless steel substrate using binder-free successive ionic layer adsorption and reaction (SILAR) method, for the first time. The formation of crystal structure and chemical states was identified using X-ray diffraction analysis and X-ray photoelectron spectroscopy, respectively. The nitrogen sorption analysis showed the micro-/mesoporous structure of La2S3-MnS-90/GO thin film exhibiting a specific surface area of 170 m(2) g(-1) and hydrophilic nature. The scanning electron microscopic image showed microstructure with porous ultrathin interconnected nanosheets. Surface texture was examined using transmission electron microscopy. The resulting La2S3-MnS-90/GO thin film electrocatalyst showed oxygen evolution reaction (OER) overpotential as low at 263 mV to reach 10 mA cm(-2) current density with Tafel slope of 48 mV dec(-1) for in 1 M KOH solution and stability over 50 h. Consequently, it could be considered one of the alternate sulfide-based catalysts for highly efficient OER evolution.