Journal
CARBON
Volume 154, Issue -, Pages 330-341Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2019.08.022
Keywords
Supercapacitors; Hollow carbon microsphere; Core/multi-shell structures; Hierarchical porous architectures; Nitrogen-doping
Funding
- National Nature Science Foundation of China [51772090, 21603094, 21671096, 21875097, 51572079]
- Natural Science Foundation of Hunan Province [2016JJ5008]
- Guangdong Special Support for the Science and Technology Leading Young Scientist [2016TQ03C919]
- Guangdong Innovative and Entrepreneurial Research Team Program [2016ZT06G587]
- Natural Science Foundation of Guangdong Province [2018B030322001]
- Basic Research Project of the Science and Technology Innovation Commission of Shenzhen [JCYJ20170817110251498, JCYJ20170412153139454]
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It is a great challenge to enhance the specific capacitance while without sacrificing the remarkable rate capability and long-term cycle durability of carbon materials for supercapacitors. Here we present a novel spherical and multi-shell hollow carbon material with tunable shell numbers and N-doping derived from a sequential synthetic route recombining hydrothermal nucleation, carbonization, and etching. The very special features, including uniform in shape and size, hollow structure, core/multi-shell architecture, hierarchical porous structures, and nitrogen doping, facilitated high specific surface area, abundant active sites, fast ion diffusions kinetics and good electrical conductivity. As a result, very superior electrochemical performance with an excellent combination of high specific capacitance (318.5 F g(-1)), and outstanding rate capability (the capacity retention ratio was more than 80% when the current density was raised from 0.1 to 10 A g(-1)), and very stable cycling (more than 94% capacity retention after 50000 cycles at 1 A g(-1)) has been achieved. This hierarchical multi-shell strategy opens a new avenue for design of high performance electrode for next-generation energy storage devices. (C) 2019 Elsevier Ltd. All rights reserved.
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