Synthesis of CoO-anchored nickel-cobalt layered hydroxide nanowire arrays via low-cobalt hydrothermal method for high-performance supercapacitors
Jinyu Wei, Chuanzheng Zhang, Xiaoqin Yang, Jia Jia, Zhihong Qin
Abstract
To address the challenges of reduced ion penetration channels, low active material utilization, and hindered charge transport in carbon fiber-supported nickel-cobalt layered double hydroxide (NiCo-LDH) with high mass loading (>5 mg cm −2 ), this study optimized the morphological structure of NiCo-LDH by regulating nickel/cobalt feeding ratios, achieving enhanced electrochemical performance with reduced cobalt content. The introduction of cobalt oxide (CoO) nanobridges not only provided effective anchoring sites for NiCo-LDH growth but also improved electron transport pathways. The as-prepared NiCo-10 composite exhibited a high specific capacitance of 2354 F g⁻¹ at 1 A g⁻¹ . When assembled into an asymmetric supercapacitor , the device delivered an energy density of 55.8 Wh kg⁻¹ at 1070.7 W kg⁻¹ power density, with 91.39 % capacitance retention after 10,000 charge-discharge cycles. These results demonstrate the superior electrochemical performance, rate capability, and cycling stability of the NiCo-10 composite, highlighting its potential for high-capacity supercapacitor applications.