Carbon Dot Regulating NiSe/MnO<sub>2</sub> Heterostructures for High-Performance Supercapacitors
Xiaotian Xie, Yi Xu, Jie Liu, Dongtian Wang, Tingting Lv, Fanshu Yuan, Qianli Zhang
Abstract
Structural regulation is an effective strategy for enhancing an electrode's energy storage performance. Herein, lignin-derived carbon dots (LCDs) are explored for the structural tailoring of NiSe/MnO 2 to improve the electrochemical performance in supercapacitors. After the dendritic NiSe microcrystals are synthesized via a microwave method, NF/NiSe/MnO 2 -LCDs are prepared by another microwave process to form a composite mixture of LCDs, MnO 2, and NF/NiSe. At 1 A g –1, NF/NiSe/MnO 2 -LCDs possess a specific capacitance of 2268 F g –1 and superb lifespans (84.43%, 3000 cycles) for their enhanced ion transport and rapid electron transfer. In addition, the NF/NiSe/MnO 2 -LCDs//AC ASC showed an energy density of 51.62 Wh kg –1 at 800 W kg – 1 and extraordinary endurance with 88.46% retention (7000 loops). The NF/NiSe/MnO 2 -LCDs offer ideas to improve the capacity retention and storage capacity of electrodes for supercapacitors.