原位电沉积镍钴双金属氢氧化物用于超级电容器电极材料的研究

In Situ Electrodeposition of Nickel-Cobalt Bimetallic Hydroxides as an Electrode Material in Supercapacitors Application

摘要: 超级电容器具有高功率密度和快速充放电速率的特点。在本文中通过简单经济的电化学电沉积技术，以硝酸镍和硫酸钴作为金属源，通过一步电沉积法，在石墨纸电极上生长了纳米球形NiCo LDH。通过多种分析技术对其形貌、组成和电化学性能进行分析，结果表明球形NiCo LDH表面由三维交联的片层结构组成。同时NiCo LDH电极表现出优异的电化学性能，在1 A·g⁻¹电流密度下的比电容为735 F·g⁻¹；10 A·g⁻¹时充放电循环3000次，电容保持率为80.4%。将其作为正极，废纸衍生的碳材料AC作为负极构建了非对称超级电容器，组装的NiCo LDH//AC非对称超级电容器(ASC)在功率密度为749.7 W·kg⁻¹具有最大能量密度为21.7 Wh·kg⁻¹，成功驱动小车模型，展现了其实际应用的潜力。

Abstract: Supercapacitors have the characteristics of high power density and fast charging and discharging rates. In this article, nano spherical NiCo LDH was grown on graphite paper electrodes using a simple and economical electrochemical deposition technique with nickel nitrate and cobalt sulfate as metal sources through a one-step electrodeposition method. Through various analytical techniques, the morphology, composition, and electrochemical properties of the spherical NiCo LDH were analyzed, and the results showed that the surface was composed of a three-dimensional cross-linked layer structure. Meanwhile, the NiCo LDH electrode exhibits excellent electrochemical performance, with a specific capacitance of 735 F·g⁻¹ at a current density of 1 A·g⁻¹; When charged and discharged 3000 times at 10 A·g⁻¹, the capacitance retention rate was 80.4%. Using it as the positive electrode and carbon material AC derived from waste paper as the negative electrode, an asymmetric supercapacitor was constructed. The assembled NiCo LDH//AC asymmetric supercapacitor (ASC) had a maximum energy density of 21.7 Wh·kg⁻¹ at a power density of 749.7 Wh·kg⁻¹, successfully driving a car model and demonstrating its potential for practical applications.