Engineered phase of nickel sulfides inside hairy hollow fibers towards high-performance anodes for flexible potassium ion hybrid capacitors

The development of potassium-ion hybrid capacitors (PIHCs) is restricted by the cathode/anode kinetics mismatch and the limited working environments. Herein, a freestanding fiber assembled from tiny carbon nanotubes capped with nickel sulfide nanocrystallites (NSCN hollow fiber) is designed as an an...

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