Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 590, Issue -, Pages 614-621Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.01.102
Keywords
Nickel carbonate hydroxide; Carbon quantum dots; Nanosheets; Energy density
Categories
Funding
- National Natural Science Foundation of China [51602129, 21875091]
- Youth Talent Training Program of Jiangsu University
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This study demonstrates the construction of advanced cathode materials for high energy density hybrid supercapacitors using a hydrothermal strategy. The NCH/NCQDs nanosheets show excellent electrochemical performance and cycling stability, indicating great potential for renewable energy storage applications.
With the ever-increasing demands for energy resources, the exploration of high energy density hybrid supercapacitors is urgently required. Herein, an effective hydrothermal strategy is demonstrated to construct advanced cathode of nickel carbonate hydroxide (NCH) ultrathin nanosheets anchored nitrogen-doped carbon quantum dots (NCQDs) for hybrid supercapacitors. It is revealed that the NCQDs are evenly deposited on the surface of NCH nanosheets, which provide abundant active sites for NCH nanosheets and endow them improved electrochemical characteristics. The NCH/NCQDs nanosheets deliver a decent electrochemical capacity of 727C g(-1) at 1 A g(-1) with ameliorative rate capability and cyclic stability. In addition, a hybrid supercapacitor device with an impressive energy density (49.1 Wh kg(-1) at 700.3 W kg(-1)) and stable cycling property (87.5% after 8000 cycles) is fabricated by employing NCH/NCQDs nanosheets and p-phenylenediamine functionalized reduced graphene oxide (PRGO) as cathode and anode. These results indicate the great potential of NCH/NCQDs nanosheets for renewable energy storage. (C) 2021 Elsevier Inc. All rights reserved.
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