Preparation and electrocatalytic hydrogen evolution performance of nitrogen, selenium-doped molybdenum disulfide/cobalt disulfide

• 1、School of Chemistry and Chemical Engineering,Chongqing University,Chongqing,401331

Abstract：Using suitable molybdenum, cobalt, and sulfur sources, the porous foam-like nitrogen, selenium co-doped molybdenum disulfide/cobalt disulfide electrocatalysts (N, Se-MoS2/CoS2) were successfully synthesized by a simple "one-pot" and vapor deposition thermal selenization method. The effect of changing the hydrothermal reaction time on the morphology of the composites was explored. The as-prepared composites were characterized by field emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD) and Raman spectra.The typical three-electrode system was adopted to investigate the electrocatalytic performance for hydrogen evolution reaction (HER) of the composites under alkaline media. The results indicated that N, Se-MoS2/CoS2-24 exhibit a good electrocatalytic hydrogen evolution performance, with an overpotential of 70 mV at 10 mA cm-2 and Tafel slope of 82.4 mV dec-1 in 1.0 M KOH solution. The electrochemically active surface area was 2120.0 cm-2.

Keywords： thermal selenization nitrogen, selenium-doped molybdenum disulfide/cobalt disulfide electrocatalysis hydrogen evolution reaction