Zhang Tianze, Wang Rui, Xiao Junpeng, Li Lu, Ma Xinzhi, Zhang Weiguang
Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025, People's Republic of China.
Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025, People's Republic of China.
J Colloid Interface Sci. 2021 Nov 15;602:123-130. doi: 10.1016/j.jcis.2021.06.011. Epub 2021 Jun 4.
Benefitting from the large interlayer spacing, ultrahigh conductivity and abundant surface chemistry, TiCT has been a promising electrode material for supercapacitors (SCs). CoS has attracted much attention due to its low cost, weak Co-S bond and relatively high theoretical capacity. Herein, CoS nanowires were grown on few-layered TiCT by one-step solvothermal method as a SC electrode. Within the composite, TiCT could function as conductive network and buffer matrix to provide ultra-fast electronic transport and relieve volume expansion of CoS nanowires. Simultaneously, the active CoS nanowires with high capacitance act as interlayer spacer to restrain the restacking of TiCT nanosheets. As a result, CoS/TiCT-5 electrode exhibits a remarkable improvement specific capacitance of 528 F g at a current density of 1 A g and ultrahigh capacitance retention of 99.3% after 20 000 cycles at a current density of 10 A g. The attempts and efforts made in this work provide a prototype for achieving excellent electrochemical properties.
得益于较大的层间距、超高的导电性和丰富的表面化学性质，TiCT一直是一种很有前景的超级电容器（SCs）电极材料。CoS因其低成本、较弱的Co-S键和相对较高的理论容量而备受关注。在此，通过一步溶剂热法在少层TiCT上生长CoS纳米线作为超级电容器电极。在复合材料中，TiCT可作为导电网络和缓冲基质，提供超快的电子传输并缓解CoS纳米线的体积膨胀。同时，具有高电容的活性CoS纳米线作为层间间隔物，抑制TiCT纳米片的重新堆叠。结果，CoS/TiCT-5电极在1 A g的电流密度下表现出528 F g的显著比电容提升，在10 A g的电流密度下经过20000次循环后具有99.3%的超高电容保持率。这项工作中的尝试和努力为实现优异的电化学性能提供了一个原型。
