Co incorporated Ni3S2 hierarchical nano/micro cactus for electrochemical water splitting

Abstract Hierarchical nano/micro Ni 3 S 2 cactus like structures were fabricated using cost effective and eco-friendly hydrothermal technique. Both pure and Co:Ni 3 S 2 composite nanostructures were grown on nickel foam under different synthesis temperatures. The synthesized nanostructures showed a wide variation of hierarchical morphology with variation of synthesis temperatures. The obtained nanostructures were investigated for electrochemical water splitting performance. The morphologies of the samples were found to acquire higher aspect ratio with increment in synthesis temperature. This morphological tuning led to remarkable enhancement in hydrogen evolution performance with very low overpotential 206 mV at 100 mA cm −2 in acidic medium. Owing to this superior morphology tuned water splitting performance, this low dimensional Ni 3 S 2 system can be recognized as potential leader in electrochemical energy harvesting sector.