文献类型：期刊文献

英文题名：Ultrathin MnO2 nanoflakes grown on N-doped carbon nanoboxes for high-energy asymmetric supercapacitors

作者：Dai, Yihui[1];Chen, Ling[1];Babayan, Vladimir[2];Cheng, Qilin[1];Saha, Petr[2];Jiang, Hao[1];Li, Chunzhong[1]

机构：[1]E China Univ Sci & Technol, Minist Educ, Sch Mat Sci & Engn, Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China;[2]Tomas Bata Univ Zlin, Univ Inst, Ctr Polymer Syst, Zlin 76001, Czech Republic

年份：2015

卷号：3

期号：42

起止页码：21337

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20154401466941);WOS:【SCI-EXPANDED(收录号:WOS:000363163200060)】；

基金：This work was supported by the National Natural Science Foundation of China (21206043, 21236003, 21371057), the Basic Research Program of Shanghai (13NM1400801), the International Science and Technology Cooperation Program of China (2015DFA51220), the 111 Project (B14018), and the Fundamental Research Funds for the Central Universities. Authors V. B. and P. S. appreciate the financial support of the Ministry of Education, Youth and Sports of the Czech Republic - Program NPU I (LO1504).

语种：英文

外文关键词：Electrodes - Electrolytes - Capacitance - Doping (additives) - Carbon - Manganese oxide

摘要：We demonstrate the synthesis of ultrathin MnO2 nanoflakes grown on N-doped carbon nanoboxes, forming an impressive hierarchical MnO2/C nanobox hybrid with an average size of 500 nm, which exhibits an excellent electrochemical performance due to the unique structure, N-doping and strong synergistic effects between them. In addition, we also assembled a green asymmetric supercapacitor (ASC) using the as-synthesized MnO2/C nanoboxes as a positive electrode and the corresponding N-doped carbon nanoboxes as a negative electrode in a neutral aqueous electrolyte, aiming to further enhance its energy density by extending the operating potential. More significantly, our ASC device is able to reversibly cycle within a wide operating voltage of 2.0 V and delivers a maximum energy density of 39.5 W h kg(-1) with superior cycling stability (similar to 90.2% capacitance retention after 5000 cycles). These intriguing results show that hollow nanostructures will be promising electrode materials for advanced supercapacitors.