Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 599, Issue -, Pages 443-452Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.04.105
Keywords
Supercapacitors; Charge-transfer structure; Sphere-in-layer structure; Carbon microparticles; Heteroatom doping
Categories
Funding
- National Science Foundation of China [51803093]
- Natural Science Foundation of Jiangsu Province [BK20180770]
- Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory [XHT2020003]
- Fundamental Research Funds for the Central Universities [WUT:2020III029]
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The nitrogen, sulfur co-doped pollen-derived carbon/graphene (PCG) composite with interconnected sphere-in-layer structure exhibited excellent electrochemical performance, including high specific capacitance and energy density for supercapacitor applications.
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.
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