High-Performance Flexible Energy Storage Devices Based on Graphene Decorated with Flower-Shaped MoS2 Heterostructures
Yongteng Qian, Zhiyi Lyu, Qianwen Zhang, Tae Hyeong Lee, Tae Kyu Kang, Minkyun Sohn, Lin Shen, Dong‐Hwan Kim, Dae Joon Kang
Abstract
MoS2, owing to its advantages of having a sheet-like structure, high electrical conductivity, and benign environmental nature, has emerged as a candidate of choice for electrodes of next-generation supercapacitors. Its widespread use is offset, however, by its low energy density and poor durability. In this study, to overcome these limitations, flower-shaped MoS2/graphene heterostructures have been deployed as electrode materials on flexible substrates. Three-electrode measurements yielded an exceptional capacitance of 853 F g−1 at 1.0 A g−1, while device measurements on an asymmetric supercapacitor yielded 208 F g−1 at 0.5 A g−1 and long-term cyclic durability. Nearly 86.5% of the electrochemical capacitance was retained after 10,000 cycles at 0.5 A g−1. Moreover, a remarkable energy density of 65 Wh kg−1 at a power density of 0.33 kW kg−1 was obtained. Our MoS2/Gr heterostructure composites have great potential for the development of advanced energy storage devices.