Journal of Colloid and Interface Science, Vol.554, 705-710, 2019
Vulcanization induced composition regulation of NiO electrode materials with improved electrochemical performances
It is well known that the electrochemical performances of electrode materials seriously depend on their shapes and structures. In this work, we synthesize NiO/NixSy microspheres by a simple hydrothermal route and vulcanization process. The as-obtained products are used as supercapacitor electrode materials. It delivers a capacitance of 1529.29 F g(-1) at 1 A g(-1). An asymmetric capacitor using NiO/NixSy as positive electrode is assembled, which keeps capacitive retention of 85.23% (10,000 cycles). The excellent electrochemical performance of NiO/NixSy electrode can be ascribed to the addition of sulfur and synergistic effect between NiO and NixSy structures. It shows that the as-prepared products can be potential electrode materials for emerging energy storage devices. (C) 2019 Elsevier Inc. All rights reserved.