Journal
NANOSCALE
Volume 13, Issue 27, Pages 11943-11952Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1nr00949d
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Funding
- National Natural Science Foundation of China [51661145025, 51972039, 51803018]
- Liaoning Revitalization Talents Program [XLYC1902122]
- Fundamental Research Funds for the Central Universities [DUT18RC(3)010]
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The study utilizes functionalized three-dimensional carbon nanocoils on nickel foam as the substrate for fabricating faradaic nickel cobaltite (NiCo2O4) electrode, demonstrating high specific capacitance and excellent cyclic stability.
Well-organized substrate materials are of considerable significance in the development of energy-efficient pseudocapacitor electrodes. Herein, functionalized three-dimensional (3D) carbon nanocoils on nickel foam (CNCs/NF) have been used as the substrate to grow faradaic nickel cobaltite (NiCo2O4) via a solvothermal method. The arrays of NiCo2O4 were assembled by interconnected ultrathin nanosheets with random inter-particle pores. The number of electroactive sites increased specifically because of the porous feature of NiCo2O4 nanosheets and the 3D structure of CNCs/NF. Moreover, the CNCs/NF network aided the electrolyte ions in diffusing deeply within the architecture. The NiCo2O4/CNCs/NF composite exhibited an outstanding specific capacitance of 2821 F g(-1) at the current density of 1 A g(-1), a remarkable rate capability (82.4%) and long cyclic stability (91.7% after 3000 cycles). Such encouraging electrochemical performance was attributed mainly to the synergistic interactions of NiCo2O4 arrays and CNCs/NF substrate that helped achieve efficient redox reactions, enhanced ion diffusivity and excellent electron conductivity. In summary, this binder-free NiCo2O4/CNCs/NF composite electrode paves a way towards the synthesis of highly efficacious electrodes for supercapacitors.
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