MnO2复合类花状镍基纳米材料制备及其在超级电容器中的应用

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中图分类号：TQ035 文献标志码：A 文章编号：1671-0460（2026）01-0006-08

Abstract： Aiming at the problems oflow energy densityof the anode materials ofsupercapacitorand highrequirements of synthesis conditions ofhydrotalcite materials，thesafeand efficient reflux and waterbath method was used to prepare “enhanced’ laminar nickel-aluminum-manganese dioxide hydrotalcite （NiAl- .MnO2 -LDH） composite electrode materials. The optimum preparation conditions for the composite of MnO2 and NiAl-LDH were determined by controlling the bath temperature and the reaction concentration of potassium permanganate （KMnO4） ）.Themorphology and crystal structure ofthe composite electrode materials were also characterized in detail with the help of scanning electron microscopy （SEM），energy spectrum analysis （EDS）and X-ray difraction （XRD）. The electrochemical performance analysis yielded that the NiAl-MnO2-LDH electrode material had a high specific capacity of 2665.57F⋅g-1 at a current density of 1A⋅g-1. ，whichwasmainlyattributedtothe introduction of MnO2 inasynergistic effect toprovide the electrode material with additional specific surface area andalarge number of electrochemicallactive sites.Finally， it was assembled with activated carbon （AC） to form a high-performance asymmetric supercapacitor with a voltage window of up to 1.6V. The specific capacitance was as high as 144.78F⋅g-1 at a current density of 1A⋅g-1 ，and the loss of specific capacitance was less than 30% （20 （1A⋅g-1） at a high rate of charging and discharging currents （20A⋅g-1） ， and the red LED lights were successfully lit up.The results indicate that compounding MnO2 with flower-like nickel-based nanomaterials using a safe and efcient reflux and water bath method has good application prospects in the field of enhancing the electrochemical performance of supercapacitors.

Key words： Reflux; Water-bath method; NiAl ⋅MnO2 -LDH; Composite electrode material;Electrochemistry; Supercapacitor

随着经济的发展，人们对能源的需求变得越来 越迫切，地球资源的过度勘探与利用导致全球气候与环境受到严重的破坏。（剩余12917字）