Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 786, Issue -, Pages 91-97Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.01.313
Keywords
Supercapacitors; Nitrogen doping; Porous structure; Actived carbon; Capacitance
Categories
Funding
- Analytical & Testing Center of Sichuan University
- Comprehensive training platform of specialized laboratory, College of chemistry, Sichuan University
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It is a great challenge to prepare high capacitance negative electrodes for high energy density supercapacitor devices. In this work, nitrogen doped carbon spheres in-situ grown on Ni foam (N doped CS/NF) are prepared as a binder-free negative electrode for supercapacitors. Due to the formation of hierarchical porous structure and N contents after nitrogen-doping, the specific area and electrochemical active sites on the surface of the electrode are effectively increased. Therefore, the specific capacitance of N doped CS/NF electrode is remarkably improved compared to pristine carbon spheres electrode. The synthesized N doped CS/NF negative electrode provides a high areal specific capacitance (C-A) of 5.75 F cm(-2) at 5 mA cm(-2) and mass specific capacitance (C-m) of 287.5 F g(-1) at 0.25 A g(-1). Furthermore, the electrode shows an excellent cycle stability of 115.6% after 10000 cycles at 100 mA cm(-2). This study proposes a synergistic approach to enhance the electrochemical performance of supercapacitor's negative electrode. (C) 2019 Elsevier B.V. All rights reserved.
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