In this work, NiCoS nanoparticles for supercapacitors are successfully synthesized with a top-down strategy, using a novel dealloying method with an ion exchange reaction. The surface morphology and x-ray diffraction investigations demonstrated that NiCoS nanoparticles are interconnected by ligaments of the synthesized sample. The dealloyed NiCoS shows an enhanced electrochemical performance of about 1132.5 F g at 0.5 A g; kinetic analysis implies a surface-controlled contribution from NiCoS (53.86% capacitive contributions). Notably, the NiCoS//AC (active carbon) device displays a comparatively high energy density (22.83 Wh kg), maximum power density (1327.1 W kg) and superior cycling performance (capacitance retention of 108% after 30 000 cycles).
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