Ni-soc-MOF derived carbon hollow sphere encapsulated Ni3Se4 nanocrystals for high-rate supercapacitors

Carbon hollow sphere encapsulated Ni3Se4 (Ni3Se4@CHS) nanocrystals are prepared using the Ni-soc-MOF by pyrolysis and further selenization. Ni3Se4@CHS exhibits a capacitance of 1720 F g(-1) at 1 A g(-1) and a capacitance retention of 97% after 6000 cycles at 5 A g(-1). Moreover, the asymmetric supercapacitor of Ni3Se4@CHS//AC displays a wide potential window of 1.6 V, an energy density of 45.2 W h kg(-1) at a power density of 800 W kg(-1), and excellent cycling stability (89% capacitance retention) after 5000 cycles. Overall, this work establishes a significant step to synthesize a new carbon-based material with appreciable capacitance and long cycling durability for potential applications in energy storage and beyond.

Automated summary

In this study, carbon hollow sphere encapsulated Ni3Se4 nanocrystals were synthesized, exhibiting high capacitance and cycling stability, making them suitable for energy storage and other applications.