Realizing ultralow overpotential during electrochemical hydrogen generation through photoexcitation of chromium disulphide.

Designing efficient electrocatalysts for hydrogen generation is desirable for electrochemical water splitting and fuel cells as they are a part of clean and sustainable energy system. Here, we are reporting the utilization of clean method for the production of platinum deposited chromium disulphide (CrS 2) particles and their application for hydrogen generation via photo-assisted electrochemical water splitting. Photoelectrochemical studies of CrS 2 show a close to zero onset potential, ultralow overpotential (8.3 mV), small Tafel slope (54 mV/decade), and low impedance (1.8 Ω) in acidic media. The chronoamperometric study of prepared catalyst reveals that it is sustainable as having a long-term stability. The post electrochemical study of electrode surface reveal the presence of traces of Pt deposited over CrS 2. The detailed compositional analysis of electrolyte has also been performed. This study opens up a pathway for electrochemically modifying the composition of the catalysts for harnessing their potential as efficient electrocatalyst during water splitting. [Display omitted] • Monoclinic CrS 2 Particles were obtained via one step pyrolysis method. • Platinum has been deposited electrochemically on CrS 2. • Prepared nanocomposites show excellent HER activity at near-zero onset potential. [ABSTRACT FROM AUTHOR]