Zn-Co-Mo-rGO Ultra-Thin Nanosheets Arrays-Based Electrode Materials for Asymmetric Supercapacitor
Shuang Liu, Siwei He, Yanhong Xiang, Xiaochun Peng, Lizhi Xiong, Jianhua Wu
Abstract
The design of electrode materials for supercapacitors (SCs) with high specific capacity and high energy density has always been a research hotspot. In this paper, ternary metal oxides Zn-Co-Mo-rGO (ZCMG) and Zn-Co-Mo (ZCM) based electrode materials were prepared by one-step hydrothermal method. Compared with the ZCM, SEM and TEM results demonstrates the ultra-thin nanosheets grown vertically on the nickel foam for ZCMG. Owing to synergistic effect of the multi-component composites, the as-prepared electrode with ZCMG exhibits the specific capacity of 713 C g−1 (1189 F g−1) at 1 A g−1, which was higher than that of ZCM without rGO (492 F g−1, 295 C g−1). The assembled ZCMG//AC (activated carbon) asymmetric supercapacitor (ASC) delivers the maximum specific capacity of 68 C g−1 (45 F g−1) at 1 A g−1. After 1000 cycles, it still has a high-capacity retention rate of 95%. Furthermore, the ASC exhibited an energy density of 14 Wh kg−1 at 750 W kg−1, and it can retain 5.23 Wh kg−1, even at 7500 W kg−1.