Enhancing hydrogen evolution: Carbon nanotubes as a scaffold for Mo2C deposition via magnetron sputtering and chemical vapor deposition

This study presents an innovative approach to fabricating carbon nanotubes (CNTs) through magnetron sputtering and chemical vapor deposition (CVD). These CNTs serve as a robust structural scaffold for the deposition of molybdenum, which, through thermal annealing, becomes molybdenum carbide (Mo 2 C), which is highly efficient for hydrogen evolution reaction (HER). Our investigation delves into the physical and chemical attributes of these electrodes, revealing insights into the functionality of Mo 2 C on CNTs hybrid structures. Chemical characterization confirms the exceptional performance of the electrode. Our Mo 2 C on CNT hybrid system showcases remarkable electrocatalytic activity, with an onset potential of 103 mV at 1 mA/cm 2 and an overpotential of 176 mV at 10 mA/cm 2 . Further validation comes from tests revealing a Tafel slope of 95 mV/dec, affirming its superiority in facilitating HER. Unparalleled combination of low charge transfer resistance and accelerated reaction kinetics, Mo 2 C on CNTs hybrid structure is poised to significantly enhance HER activity. • Fabrication of hierarchical compound of Mo 2 C deposited on CNTs as binder-free electrodes. • In-situ carburization of Mo by C species provided by CNTs template. • Enhanced HER activity, demonstrated by a ∼220 mV decrease in required overpotential.