Heterointerface-driven catalytic enhancement in a hierarchical VCoSe2@rGO@Fe3C nanocomposite for energy storage and hydrogen evolution reaction

초록

The development of multifunctional electrode materials that simultaneously enable efficient energy storage and hydrogen production is essential for sustainable energy technologies. Herein, a VCoSe2@rGO@Fe3C hybrid composite is prepared by a hydrothermal method and evaluated for supercapattery and hydrogen evolution reaction (HER) applications. XRD, SEM, Raman, and XPS analyses confirm the effective incorporation of reduced graphene oxide (rGO) and Fe3C with VCoSe2, forming an interconnected architecture that enhances charge transport, structural stability, and electrochemical activity. The hybrid nanocomposite provides a high specific capacity of 323.9 mA h g- 1. The assembled VCoSe2@rGO@Fe3C//AC hybrid device realizes an energy density of 57.33 Wh kg- 1 at a power density of 2080 W kg- 1 over 15,000 cycles. In HER testing, the electrode exhibits excellent electrocatalytic parameters, including a low Tafel slope of 41 mV dec- 1 and decreased overpotential of 35 mV, together with strong long-term durability and negligible degradation. These outcomes validate that the rationally designed VCoSe2@rGO@Fe3C nanocomposite is an auspicious low-cost electrode for next-generation energy and hydrogen-production systems.

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