ScholarWorks@중앙대학교

초록

Transition-metal chalcogenides (TMCs) are promising candidates for energy storage applications owing to their excellent electrical conductivity and ultrahigh specific capacity. Drawing inspiration from the potential of Prussian blue analogues (PBAs) to form well-defined porous nanostructures, we developed a sustainable synthesis strategy that integrates PBA co-precipitation with thermal selenization to construct a three-dimensional porous AlCoSe@NC framework exhibiting a cube-like morphology. Controlled thermal treatment enabled the uniform dispersion of AlCoSe nanoparticles (∼17 nm) within a larger N-doped carbon framework (251–357 nm), resulting in strong synergistic effects that enhance charge storage. The optimized electrode delivered a remarkable specific capacitance of ∼1589 F g−1 at 1 A g−1 and retained ∼94.6 % of its capacitance after 5000 cycles, benefiting from its 3D framework enriched with abundant electroactive sites. When assembled into an asymmetric supercapacitor with MXene as the negative electrode, the device achieved a high energy density of ∼62.8 Wh kg−1 at 0.8403 kW kg−1 and preserved ∼83.2 % of its capacitance after 10,000 cycles at 16 A g−1. These outstanding electrochemical properties exceed most reported Co-based electrodes, positioning AlCoSe nanocubes as a highly promising candidate for freestanding, binder-free electrodes in next-generation energy storage and conversion devices.

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