Ye Beirong, Gong Chao, Huang Miaoliang, Tu Yongguang, Zheng Xuanqing, Fan Leqing, Lin Jianming, Wu Jihuai
Engineering Research Center of Environment-Friendly Functional Materials, Ministry of Education, Institute of Materials Physical Chemistry, College of Materials Science and Engineering, Huaqiao University Xiamen Fujian 361021 P. R. China
RSC Adv. 2018 Feb 20;8(15):7997-8006. doi: 10.1039/c7ra12919j. eCollection 2018 Feb 19.
Cobalt telluride (CoTe) nanosheets as supercapacitor electrode materials are grown on carbon fiber paper (CFP) by a facile hydrothermal process. The CoTe electrode exhibits significant pseudo-capacitive properties with a highest of 622.8 F g at 1 A g and remarkable cycle stability. A new asymmetric supercapacitor (ASC) is assembled based on CoTe (positive electrode) and activated carbon (negative electrode), which can expand the operating voltage to as high as 1.6 V, and has a specific capacitance of 67.3 F g with an energy density of 23.5 W h kg at 1 A g. The performance of the ASC can be improved by introducing redox additive KFe(CN) into alkaline electrolyte (KOH). The results indicate that the ASC with KFe(CN) exhibits an ultrahigh specific capacitance of 192.1 F g and an energy density of 67.0 W h kg, which is nearly a threefold increase over the ASC with pristine electrolyte.
碲化钴（CoTe）纳米片作为超级电容器电极材料，通过简便的水热法生长在碳纤维纸（CFP）上。CoTe电极在1 A g时表现出显著的赝电容特性，最高比电容为622.8 F g，并且具有出色的循环稳定性。基于CoTe（正极）和活性炭（负极）组装了一种新型非对称超级电容器（ASC），其工作电压可扩展至高达1.6 V，在1 A g时比电容为67.3 F g，能量密度为23.5 W h kg。通过将氧化还原添加剂KFe(CN)引入碱性电解质（KOH）中，可以提高ASC的性能。结果表明，含有KFe(CN)的ASC表现出192.1 F g的超高比电容和67.0 W h kg的能量密度，与使用原始电解质的ASC相比，几乎增加了两倍。
