文献类型：期刊文献

英文题名：Porous Co9S8 Nanosheet Arrays@Co Foam Electrode via in Situ Sulfidation at Room Temperature for Superior Supercapacitors

作者：Zhu, Zhaoqiang[1];Lin, Jiahao[1];Li, Nan[1];Zhang, Ruizhi[1];Zhang, Kefu[1];Zhao, Chunhua[1];Chen, Guorong[1];Zhao, Chongjun[1]

机构：[1]East China Univ Sci & Technol, Key Lab Ultrafine Mat, Minist Educ, Shanghai Key Lab Adv Polymer Mat,Sch Mat Sci & En, Shanghai 200237, Peoples R China

年份：2020

卷号：124

期号：1

起止页码：83

外文期刊名：JOURNAL OF PHYSICAL CHEMISTRY C

收录：;EI(收录号：20200107971120);WOS:【SCI-EXPANDED(收录号:WOS:000507149600011)】；

基金：We are grateful for the support of Natural Science Foundation of Shanghai (No. 19NR1413000, 13ZR1411900), Shanghai Alliance Plan (No. LM201881, LM201751), Shanghai Leading Academic Discipline Project (B502), and Shanghai Key Laboratory Project (08DZ2230500). We also thank Research Center of Analysis and Test of East China University of Science and Technology for the help on the characterization.

语种：英文

外文关键词：Activated carbon - Supercapacitor - Nanosheets - Capacitance - Electrodes - Sodium sulfate - Sulfur compounds

摘要：In this work, novel porous Co9S8 nanosheet arrays are prepared on Co foam through a simple and scalable chemical liquid -phase processing strategy, which involves the uniform growth of cobalt hydroxide hydrogen phosphate microbelts followed by subsequent in situ sulfidation with sodium sulfide at room temperature. As -prepared porous Co9S8 nanosheet arrays can be directly used as binderless electrodes for a supercapacitor. Even at a high mass loading of 11.54 mg cm(-2), it delivers a high capacitance of 14518.9 mF cm -2 (1279.4 F g-') and an exceptional cycle life with a capacitance retention of 85.7% after 15000 cycles at 200 mA cm -2. Moreover, an assembled asymmetric supercapacitor based on an activated carbon negative electrode delivers an encouraging energy density (42.9 W h kg(-1) at 828.5 W kg(-1)) and an excellent cycle life (86% retention after 10000 cycles). This method can be extended to design and construct other high-performance sulfide electrodes for supercapacitors and other energy storage systems.