A composite-hydroxide-activation strategy for the preparation of N/S dual-doped porous carbon materials as advanced supe
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A composite-hydroxide-activation strategy for the preparation of N/S dual-doped porous carbon materials as advanced supercapacitor electrodes Wei Zhang1,2, huadong Tian2, Rongrong Cheng2, Zhengde Wang2, YangZhou Ma2, Songlin Ran1, Yaohui Lv1,2,3,* , and Lianbo Ma2,3,* 1
Key Laboratory of Metallurgical Emission Reduction & Resources Recycling, Ministry of Education, Anhui University of Technology, Maanshan 243002, Anhui, China 2 School of Materials Science and Engineering, Anhui University of Technology, Anhui 243002, Maanshan, China 3 Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials, Ministry of Education, Anhui University of Technology, Maanshan 243002, Anhui, China
Received: 20 April 2020
ABSTRACT
Accepted: 24 October 2020
Nitrogen and sulfur co-doped hierarchical porous carbon has gained enormous attention in energy storage field owing to its high capacitance and chemical stability. Herein, nitrogen and sulfur co-doped hierarchical porous carbon derived from ginkgo leaves is fabricated via carbonization followed by a facile composite-hydroxide-activation (CHA) strategy for supercapacitors application. The resultant carbon features sheet-like structures with hierarchical pores, possessing specific surface area (1975 m2 g-1), micropore volume (0.62 cm3 g-1), and higher heteroatom content up to 1.88% (N element) and 1.87% (S element). Due to its compositional and structural advantages, the nitrogen and sulfur codoped hierarchically porous carbon exhibits a high specific capacitance of 333.4 F g-1 (at 0.1 A g-1) and an excellent rate capability (277.5 F g-1 at 20 A g-1). A superior cycling stability can be obtained as well with 94.4% capacitance retention after 10,000 cycles at 5 A g-1. In addition, the XPS result confirms that CHA strategy could be effective to fix heteroatoms into the primarily aromatic carbon backbone. The present study demonstrates an effective and universal strategy to develop high-performance hierarchical porous carbon from biomass for energy storage devices.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
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https://doi.org/10.1007/s10854-020-04751-3
J Mater Sci: Mater Electron
1 Introduction Thanks to the high power density and remarkable cycling stability, supercapacitors have attracted considerable attention in the past decades [1–3]. Carbon materials, due to the extraordinary chemical, mechanical, thermal stability, and abundance, are the most candidates as electrode materials in supercapacitors [4]. Among them, activated carbon (AC) has been applied to commercialized electrode material of supercapacitors. Nevertheless, the specific capacitance of conventional activated carbons (CAC) is restricted by their incongruous pore texture and low conductivity. There are some strategies for enhancing electrochemical performance of supercapacitor, mainly including increasing electric conductivity, incorporation heteroatoms, constructing two-dimensional (2D)
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