Rational Design of NiCo-borate/GO Heterojunction as a High-Performance Supercapacitor Electrode
Pinghua Chen, Huanghuang Song, Zilong Zou, Hualin Jiang, Xinman Tu, Weiqiang Zhou, Jun Zhou, Tingliang Liu, Guanghui Wu, Haiying Zhou
Abstract
The bottleneck in the preparation of supercapacitors is how to develop high-energy and high-power-density devices by using appropriate materials. Herein, a novel Ni x Co 3– x -B/GO heterostructure material was synthesized through a simple ultrasonic and precipitation method. The prepared Ni x Co 3– x -B/GO heterostructure exhibits significant improvements in supercapacitor performance than Ni x Co 3– x -B. The presence of GO effectively suppresses the excessive growth and accumulation of Ni x Co 3– x -B; therefore, Ni 2.7 Co 0.3 -B/GO exhibits the best performance as an electrode material for supercapacitors: a high specific capacitance ( C m, 1789.72 F g –1 @1 A g –1 ) and excellent rate performance. The asymmetric supercapacitor (ASC) device of Ni 2.7 Co 0.3 -B/GO//AC exhibits a C m of 76.6 F g –1 @1 A g –1, a large voltage window of 1.6 V, and a high energy density (ED) of 98.0 Wh kg –1 . Furthermore, a flexible, all-solid-state supercapacitor assembled with Ni 2.7 Co 0.3 -B/GO as both the positive and negative electrodes demonstrates a C m of 46.9 F g –1 @1 A g –1 . Even after multiple folding and bending at various angles, the device maintains excellent performance, showcasing remarkable stability. With a power density (PD) of 479.7 W kg –1, the device achieves a high ED of 60.0 Wh kg –1 . This work provides valuable insights into the synergistic effects in electrochemical processes based on heterostructure materials.