One-step microwave synthesis of NiO/NiS@CNT nanocomposites for high-cycling-stability supercapacitors

NiO/NiS@CNT and NiO@CNT nanocomposites were rapidly fabricated using a one-step microwave method in 60 s. The electrochemical performances of the prepared electrodes with different mass ratios and microwave conditions for supercapacitors were investigated. NiO/NiS@CNT showed a high specific capacitance of 809.7 F g(-1) at 1 A g(-1) and tremendous cycling stability of approximately 100% retention after 20 000 cycles at 5 A g(-1), indicating better electrochemical performance than NiO@CNT. The asymmetric supercapacitor device based on NiO/NiS@CNT//activated carbon (AC) displayed high energy and power density and excellent cycling stability, demonstrating enormous potential for energy-storage applications. (C) 2019 Elsevier B.V. All rights reserved.