以硫酸钴(CoSO₄·7H₂O)为钴源、硫酸镍(NiSO₄·7H₂O)为镍源,通过水热法将多壁碳纳米管(MWCNTs)嵌入到钴镍层状双金属氢氧化物(CoNi-LDHs)中合成CoNi-LDHs/MWCNTs复合材料。通过FT-IR、FE-SEM、XRD等分析方法对复合材料的微观组织结构和表面形貌进行表征,并通过循环伏安、恒流充放电以及交流阻抗谱等测试方法对该材料的电化学性能进行研究。结果表明,当反应体系中引入MWCNTs后,CoNi-LDHs颗粒均匀地嵌入碳纳米管网络中,与碳纳米管紧密结合交错在一起,增大了材料的表面积,为氧化还原反应提供了丰富的活性位点;在电流密度为0.5 A/g下,复合材料比电容高达1 965.55 F/g,表明该复合材料具有优异的电化学性能。

CoNi-LDHs/MWCNTs composites are synthesized through embedding multi-walled carbon nanotubes (MWCNTs) in cobalt-nickel layered double hydroxide (CoNi-LDHs) by means of hydrothermal method using cobalt sulfate (CoSO₄·7H₂O) as cobalt source and nickel sulfate (NiSO₄·7H₂O) as nickel source.The microstructure and surface morphology of the composites are characterized by infrared spectroscopy (FT-IR),field emission scanning electron microscopy (FE-SEM) and X-ray diffraction.The electrochemical properties of the composites are studied by means of cyclic voltammetry,constant current charge-discharge and alternating current impedance spectrum.It is found when MWCNTs have been added into the reaction system,CoNi-LDHs particles are uniformly embedded in the network of carbon nanotubes,and tightly bound and interlaced with carbon nanotubes,which increases the surface area of the composites and provides abundant active sites for REDOX reaction.Electrochemical tests show that the specific capacitance of the composites reaches as high as 1 965.55 F·g^-1 at a current density of 0.5 A·g^-1,indicating an excellent electrochemical performance.

叶发萍(1992-),女,硕士研究生,研究方向为功能材料,2585288268@qq.com