Nitrogen, sulfur co-doped hierarchical carbon encapsulated in graphene with "sphere-in-layer" interconnection for high-performance supercapacitor

被引:103
作者
Cao, Lihua [1 ]
Li, Huiling [1 ]
Liu, Xiaolin [2 ]
Liu, Shuwu [3 ]
Zhang, Lin [4 ]
Xu, Wenhui [5 ]
Yang, Haoqi [6 ]
Hou, Haoqing [3 ]
He, Shuijian [1 ]
Zhao, Yan [2 ,7 ]
Jiang, Shaohua [1 ]
机构
[1] Nanjing Forestry Univ, Coll Mat Sci & Engn, Jiangsu Coinnovat Ctr Efficient Proc & Utilizat F, Int Innovat Ctr Forest Chem & Mat, Nanjing 210037, Peoples R China
[2] Wuhan Univ Technol, Int Sch Mat Sci & Engn, State Key Lab Silicate Mat Architectures, Wuhan 430070, Hubei, Peoples R China
[3] Jiangxi Normal Univ, Dept Chem & Chem Engn, Nanchang 330029, Jiangxi, Peoples R China
[4] MIT, Media Lab, Cambridge, MA 02139 USA
[5] Jiangxi Univ Tradit Chinese Med, Sch Pharm, Nanchang 330004, Jiangxi, Peoples R China
[6] Jilin Univ, Coll Mat Sci & Engn, Changchun 130022, Peoples R China
[7] Wuhan Univ, Inst Technol Sci, Wuhan 430072, Hubei, Peoples R China
基金
美国国家科学基金会;
关键词
Supercapacitors; Charge-transfer structure; Sphere-in-layer structure; Carbon microparticles; Heteroatom doping; POROUS CARBON; ELECTRODE MATERIALS; NANOSPHERES; NANOSHEETS; DESIGN;
D O I
10.1016/j.jcis.2021.04.105
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Rational design of electrode with hierarchical charge-transfer structure and good electronic conductivity is important to achieve high specific capacitance and energy density for supercapacitor, but it still remains a challenge. Herein, a nitrogen, sulfur co-doped pollen-derived carbon/graphene (PCG) composite with interconnected "sphere-in-layer" structure was fabricated, in which hierarchically pollen-derived carbon microspheres can serve as "porous spacers" to prevent the agglomeration of graphene nanosheets. The optimized PCG composite prepared with 0.5 wt% of graphene oxide (PCG-0.5) exhibited high specific capacitance (420 F g(-1) at 1 A g(-1)), rate performance (280 F g(-1) at 20 A g(-1)), and excellent cycling stability with 94% of capacitance retention after 10,000 cycles. The symmetrical device delivered a remarkable energy density of 31.3 Wh kg(-1) in neutral medium. Moreover, density functional theory calculation revealed that PCG electrode possessed the accelerated charge transfer and enhanced electronic conductivity, thus ensuring a remarkable electrochemical performance. This work may afford an effective strategy for the development of biomass-derived carbon electrodes with novel charge-transfer structure toward supercapacitor applications. (C) 2021 Elsevier Inc. All rights reserved.
引用
收藏
页码:443 / 452
页数:10
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