Abstract
The design of non-noble metal-based nanocomposites for the evolution of hydrogen gas in energy conversion devices is important ongoing research. In this study, carbon dot (CD) based bi-metallic hydroxide nanocomposites were synthesized for the electrocatalytic hydrogen evolution reaction. A series of nickel-cobalt double hydroxide nanocomposites were synthesized using a CD support. The structural features of the nanoparticles were analyzed through proper microscopic studies. The overpotential was −234 mV vs. Ag/AgCl electrode (−25 mV with respect to RHE) for the hydrogen evolution reaction at a current density of 10 mA cm−2. The Tafel slope was calculated to be 47 mV dec−1. The catalytic properties were attributed to the intrinsic layered structure, interconnected nanoarray configuration, and unique redox characteristics. CDs, with significant surface defects provided a higher active area for catalysis and electronic environment. This study highlights the use of a CD support for the synthesis of low-cost metal hydroxide electrocatalyst.
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