Surface modification of electrocatalyst suitable for yielding reduced over potential with improved exchange current density at the interface is highly desired for hydrogen evolution reaction (HER). Herein, the present report demonstratesthe HER performance of ordered mesoporous carbon (OMC)-supported nickel-modified MoS$_2$ electrocatalysts [NiMoS($x$)–OMC] synthesized by hydrothermal route. Inherent activity of pristine MoS$_2$ was improved by two vital surface strategies utilizing OMC as the support matrix for the dispersed growth of active catalyst and surpassing the active sites formation via augmentation of various concentrations of nickel. Crystalline phase, heterostructure vibrations, morphological orientationand electrocatalytic property of the prepared catalysts are comprehensively studied using different spectroscopic methods. Linear sweep voltammetric analysis suggests that the HER from the pristine MoS2 could be amplified by introducing OMC as support matrix. Synergistic enrichment of Ni (3 and 5 wt%) on MoS$_2$–OMC matrix enables both the lowest onset potential (180 and 185 mV) and Tafel slope values (103 and 100 mV per decade), with retained stability promising for further optimization and scalability.
Volume 43, 2020
Continuous Article Publishing mode
Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020
Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
Physical Sciences 2020
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