Novel Two-Dimensional MoC/MnSe Composites for Supercapacitors and Hydrogen Evolution Reaction

This study presents the synthesis and characterization of a novel MoC/MnSe composite via a hydrothermal method to enhance its performance in supercapacitor (SC) and hydrogen evolution reaction (HER) applications. The composite electrode exhibits remarkable electrochemical properties in both the applications. The composite demonstrates excellent specific capacitance (1387 F g–1 at 1.0 A g–1 current density) along with outstanding cyclic stability (high-capacity retention of 94% after 10,000 cycles). This enhanced performance can be attributed to the composite’s large surface area contributing to the increased electrochemical active sites, rendering it a promising candidate for efficient energy storage. Furthermore, the MoC/MnSe composite electrode excels in the HER, showcasing superior hydrogen evolution activity with minimal overpotential (169 mV υs RHE at 10 mA cm–2) and a small Tafel slope (135 mV dec–1). The composite’s improved stability underlines its potential for long-term applications. The notable attributes of this MoC/MnSe composite, coupled with its ability for large-scale production, hold promise for addressing the growing demands of energy storage and conversion technologies.