Hierarchically Engineered NiSnSe2@r-GO@Ni-MOF Composite as a Bifunctional Electrode for High-Performance Supercapacitors and Hydrogen Evolution Reaction

초록

Developing multifunctional electrode materials that integrate high energy storage capacity with catalytic activity is essential for next-generation energy systems. Herein, a hierarchically engineered NiSnSe2@r-GO@Ni-MOF composite was synthesized by the use of a two-step hydrothermal process, combining the high conductivity of r-GO, the porous framework of Ni-MOF, and the redox activity of NiSnSe2. Structural and morphological investigations (SEM, XRD, Raman, XPS, and BET-BJH) confirmed the formation of a well-integrated mesoporous architecture with a large available electroactive sites and effective electron-ion transport. Electrochemical evaluation exhibited a high specific capacity of 1297.8 C g(-)& sup1;. The assembled asymmetric device (NiSnSe2@r-GO@Ni-MOF//AC) achieved an energy density of 44.8 Wh kg(-)& sup1; and a power density of 1120 W kg(-)& sup1;, with 90% capacity retention over 7,000 cycles. Additionally, the composite exhibited excellent HER response and delivered a low overpotential of 49 mV and a Tafel slope of 52 mV dec(-)& sup1;. The boosted bifunctional enactment is accredited to strong interfacial coupling and stabilizes the electrode structure, which highlights a scalable strategy for designing efficient multifunctional heterostructure to overcome the energy crisis in the present era.

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