HKUST-1@Co(OH)@rGO nanocomposite electrode for hybrid supercapacitor and HER applications

초록

This research focuses on the invention of the HKUST@Co(OH)2@rGO nanocomposite, which was successfully fabricated through a facile hydrothermal-assisted growth approach. The HKUST framework focused on the uniform integration of Co(OH)2 nanosheets onto conductive rGO sheets. The synergistic integration of porous HKUST and rGO significantly enhances conductivity and electrochemical performance compared with Co(OH)2, creating numerous redox-active sites and effective charge transport, resulting in an improved specific capacity (Qs) of 2640.35 C g-1. For an asymmetric supercapacitor, the nanocomposite exhibited a high specific capacity of 463.22 C g-1 at 1 A g-1, attaining an energy density of 45.35 Wh kg-1 at a power density of 2775.65 W kg-1, while maintaining 97% capacitance over 10,000 charging/discharging cycles, confirming exceptional reliability. Except for energy storage, the material displayed notable hydrogen evolution reaction (HER) activity (overpotential of 46 mV), characterized by stable performance, reproducibility, and durable current response. These outcomes emphasize the dual potential of HKUST@Co(OH)2@rGO composite as a multifunctional platform for next-generation supercapacitors and sustainable electrocatalysts, contributing a practicable pathway toward scalable energy and hydrogen technologies.

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