摘要
采用一步溶剂热法在泡沫镍(NF)基底上合成了镍钴氢氧化物、镍铁氢氧化物及镍钴铁氢氧化物3种电极材料,并对其电化学性能进行测试,结果表明:三元镍钴铁金属电极的储能性能要远大于其他2种二元金属电极,其在2 mA·cm^(-2)电流密度下能达到5.11 F·cm^(-2)的面积比电容,并且构筑的非对称超级电容器在功率密度为46.814 W·m^(-2)时所能达到的最大能量密度为5.994 Wh·m^(-2)。研究发现三元镍钴铁金属电极的优异储能性能可归因于其疏松的絮状结构使其在单位体积内具有更大的比表面积,能储存更多的电荷,同时掺杂钴、铁元素后,可增强电极内部电子转移,降低活性物质和电解液之间的接触电阻,提高导电性。
Three electrode materials of nickel⁃cobalt hydroxide,nickel⁃iron hydroxide,and nickel⁃cobalt⁃iron hydroxide were synthesized on nickel foam(NF)via a one⁃step solvothermal method.The electrochemical tests showed that the ternary nickel⁃cobalt⁃iron metal electrode with the best energy storage performance outperforms the other two binary metal electrodes,and it could reach an area capacitance of 5.11 F·cm^(-2) at a current density of 2 mA·cm^(-2).To further investigate the practical application,an asymmetric supercapacitor was assembled with NiCoFe⁃OH/NF as the positive electrode and activated carbon as the negative electrode,respectively,and the device achieved a maximum energy density of 5.994 Wh·m^(-2) at a power density of 46.814 W·m^(-2).The results show that the excellent performance of NiCoFe⁃OH/NF can be attributed to loosen flocculent structure,which provides larger specific surface area per unit volume and subsequently store more electric charges,as well as facilitate electron/ion transportation,reduce the contact resistance between active material and electrolyte,and increase the electrical conductivity.
作者
谢登奎
范爱玲
庞伟
郭亚奇
高殿超
XIE Deng-Kui;FAN Ai-Ling;PANG Wei;GUO Ya-Qi;GAO Dian-Chao(Department of Materials and Manufacturing,Beijing University of Technology,Key Laboratory of Advanced Functional Materials,Ministry of Education,Beijing 100124,China)
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2022年第1期31-38,共8页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金(No.22075290)资助。
关键词
溶剂热法
镍钴铁
三元金属电极
超级电容器
储能性能
solvothermal method
nickel⁃cobalt⁃iron
ternary metal electrode
supercapacitor
energy storage performance
