Zhang Ning, Wang Wencong, Teng Changqing, Wu Zongxiao, Ye Ziran, Zhi Mingjia, Hong Zhanglian
State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University 38 Zheda Road Hangzhou 310027 China.
Department of Applied Physics, Zhejiang University of Technology Zhaohui Campus Hangzhou 310014 China.
RSC Adv. 2018 Aug 3;8(48):27574-27579. doi: 10.1039/c8ra04296a. eCollection 2018 Jul 30.
This work reported CoS nanoparticle-decorated carbon nanofibers (CNF) as a supercapacitor electrode. By using a mild ion-exchange method, the cobalt oxide-based precursor nanoparticles were transformed to CoS nanoparticles in a microwave hydrothermal process, and these nanoparticles were decorated onto a carbon nanofiber backbone. The composition of the nanofibers can be readily tuned by varying the Co acetate content in the precursor. The porous carbon nanofibers offered a fast electron transfer pathway while the well dispersed CoS nanoparticles acted as the redox center for energy storage. As a result, high specific capacitance of 718 F g at 1 A g can be achieved with optimized CoS loading. The assembled asymmetric supercapacitor with CoS/CNF as the cathode showed a high energy density of 23.8 W h kg at a power density of 0.75 kW kg and good cycling stability (16.9% loss over 10 000 cycles).
这项工作报道了用硫化钴纳米颗粒修饰的碳纳米纤维（CNF）作为超级电容器电极。通过温和的离子交换方法，在微波水热过程中将基于氧化钴的前驱体纳米颗粒转化为硫化钴纳米颗粒，并将这些纳米颗粒修饰在碳纳米纤维骨架上。通过改变前驱体中醋酸钴的含量，可以很容易地调节纳米纤维的组成。多孔碳纳米纤维提供了快速的电子转移途径，而分散良好的硫化钴纳米颗粒充当储能的氧化还原中心。结果，在优化的硫化钴负载量下，在1 A g时可实现718 F g的高比电容。以硫化钴/碳纳米纤维作为阴极组装的不对称超级电容器在功率密度为0.75 kW kg时显示出23.8 W h kg的高能量密度和良好的循环稳定性（在10000次循环中损失16.9%）。
