Hexagram-like CoS-MoS composites with enhanced activity for hydrogen evolution reaction.

Hexagram-like CoS-MoS composites were prepared on indium tin oxide (ITO) conductive glasses via cyclic voltammetry electrodeposition using Co(NO) and (NH)MoS as precursors and tested for application in hydrogen evolution reaction (HER). The structure of CoS-MoS composites was characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and X-ray photoelectron spectrum (XPS). Electrochemical characterizations indicate that CoS-MoS composites exhibit more excellent catalytic activity and stability than MoS. Compared with pure MoS, the hexagram-like CoS-MoS composites with increased specific surface area improved the density of exposed active sites, and the Co binding S edges in CoS-MoS composites promote the number of highly catalytic edge sites and decreased the binding energy △ G . Moreover, the effects of different substrates on the CoS-MoS composites were also investigated. Our further understanding of this highly active hydrogen evolution catalyst can facilitate the development of economical electrochemical hydrogen production systems. [ABSTRACT FROM AUTHOR]