Sun Anqi, Chen Wei, Yang Jing, Gao Meng, Ning Liangmin, Yu Hao, Wang Kunhua, Guan Meili, Lv Ruitao, Fu Min
College of Chemical and Biological Engineering, College of Energy Storage Technology, Shandong University of Science and Technology, Qingdao 266590, China.
College of Chemical and Biological Engineering, College of Energy Storage Technology, Shandong University of Science and Technology, Qingdao 266590, China.
J Colloid Interface Sci. 2025 Dec;699(Pt 2):138287. doi: 10.1016/j.jcis.2025.138287. Epub 2025 Jun 27.
Nickel-based bimetallic hydroxides are widely used as supercapacitor electrodes owing to their high theoretical capacitance and cost-effectiveness. Nevertheless, challenges of low conductivity and substantial volume expansion exist during cycling processes. Herein, NiCo-layered double hydroxides (NiCo-LDH) nanosheets are electrodeposited on nickel foam (NF), followed by the generation of prussian blue analogs (PBA) on the surface of NiCo-LDH via the ion exchange, obtaining the NiCo-LDH/PBA. The introduction of PBA can enhance the structural stability and reduce the agglomeration of the NiCo-LDH during cycling. By optimizing the ion exchange duration, the spherical flower-like NiCo-LDH/PBA exposing substantial redox active sites can be obtained. The optimal NiCo-LDH/PBA yields specific capacitances of 1973.0 and 1604.4 F g at 2 and 10 A g, respectively. Asymmetric supercapacitors assembled with NiCo-LDH/PBA and activated carbon delivers an energy density of 66.3 Wh kg at a power density of 725.0 W kg and acceptable cycling stability. These remarkable performances of the NiCo-LDH/PBA electrode render it one promising candidate as advanced supercapacitor electrodes.
镍基双金属氢氧化物因其高理论电容和成本效益而被广泛用作超级电容器电极。然而，在循环过程中存在低电导率和大量体积膨胀的挑战。在此，将镍钴层状双氢氧化物（NiCo-LDH）纳米片电沉积在泡沫镍（NF）上，然后通过离子交换在NiCo-LDH表面生成普鲁士蓝类似物（PBA），得到NiCo-LDH/PBA。PBA的引入可以增强结构稳定性并减少循环过程中NiCo-LDH的团聚。通过优化离子交换持续时间，可以获得暴露大量氧化还原活性位点的球形花状NiCo-LDH/PBA。最佳的NiCo-LDH/PBA在2和10 A g时的比电容分别为1973.0和1604.4 F g。用NiCo-LDH/PBA和活性炭组装的不对称超级电容器在功率密度为725.0 W kg时的能量密度为66.3 Wh kg，并且具有可接受的循环稳定性。NiCo-LDH/PBA电极的这些优异性能使其成为先进超级电容器电极的一个有前途的候选者。
