花状MgCo_(2)O_(4)@CoMn LDH复合材料的制备与性能研究

Preparation and Properties of Flower-like MgCo_(2)O_(4)@CoMn LDH Nanocomposites

超级电容器(SCs)因其功率高、稳定性能好和快速的充放电能力,在储能设备领域受到广泛关注。采用水热法结合电沉积法合成花状MgCo_(2)O_(4)@CoMn层状双氢氧化物(LDH)复合材料。得益于MgCo_(2)O_(4)和CoMn LDH异质界面间的协同作用,改善了复合材料的电子传输;此外,低结晶度CoMn LDH的成功复合提供了良好的亲水性和活性位点;电化学测试中,复合材料在4.5 mg/cm~2的高负载量下,表现出1 501.8 F/g的高比电容,并且在20 A/g的电流密度下循环3 000次后,比电容保持率为82.98%,展示了其优异的循环稳定性。结果表明MgCo_(2)O_(4)@CoMn LDH复合材料可用作电化学储能的电极材料之-。

Due to their high power,good stability performance,and fast charging and discharging capabilities,supercapacitors(SCs)have attracted much attention in energy storage devices.In this study,we synthesized flower-like MgCo_(2)O_(4)@CoMn layer-double hydroxide(LDH)composites by hydrothermal method and electrodeposition.Due to the synergistic interaction between the heterogeneous interfaces of MgCo_(2)O_(4) and CoMn LDH,the electron transport of the composites was improved.In addition,the successful composite of CoMn LDH with low crystallinity provided good hydrophilicity and active sites.In electrochemical tests,the composite material exhibited a high specific capacity of 1501.8 F/g at a high loading of 4.5 mg/cm^(2).At a current density of 20 A/g,the capacity retention was 82.98%after 3000 cycles.It turned out that the composite material demonstrated excellent cycling stability.The resultus show that the MgCo_(2)O_(4)@CoMn LDH composite can be used as one of the electrode materials for electrochemical energy storage.