MoS2 supported on Er-MOF as efficient electrocatalysts for hydrogen evolution reaction

Abstract

The key to synthesis highly efficient MoS2 based electrocatalyst for hydrogen evolution reaction (HER) is to construct a reasonable composite system structure to improve the stability, reduce the aggregation and improve the intrinsic poor conductivity. In this paper, MoS₂ composite of erbium-based metal-organic framework (noted as Er-MOF/MoS2) were synthesized by hydrothermal method. The morphology and structure of the synthesized samples were characterized by powder X-ray diffraction (XRD), field emission electron microscopy (FESEM), scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS), and the electrocatalytic performances were tested by linear sweep voltammograms (LSV), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), i-t. On the basis of the experiment, Er-MOF/MoS2 shows improved conductivity and more exposed active sites, exhibiting excellent HER activity in acidic media, with only 234 mV overpotential to achieve 10 mA cm−2, and a Tafel slope of 54.3 mV dec−1. This strategy of porous structure of MoS2 composite rare earth metal organic framework materials provides a novel and effective solution for preparing high performance MoS2 based electrocatalyst.