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A comprehensive study on two types of supercapacitor composite electrodes comprising MnO2 and activated carbon nanofibers: Self-supporting membrane and ground powder

Journal Article · · Journal of Energy Storage
 [1];  [1];  [2];  [1];  [1];  [1];  [1]
  1. University of Science and Technology Liaoning, Anshan (China)
  2. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Manganese dioxide (MnO2)@carbon composites have been attractively considered as electrode materials for supercapacitors (SCs) due to synergistic effects. This work systematically investigated the structure of MnO2@carbon nanofiber (CNF) composite electrodes with the different forms of CNFs and the corresponding electrochemical performance of SCs. In brief, novel activated carbon nanofibers were first fabricated by electrospinning the hydroxyl-containing poly(amic acid) solution, and then the preferred CNF material was decorated by MnO2 crystals in the form of self-supporting membrane and ground powders, respectively. Additionally, the synthesis parameters were investigated and optimized based on the electrochemical performance of SCs. The results reveal that the powdered composite electrode exhibits a higher specific surface area of 501 m2 g–1 compared to the self-supporting membrane composite electrode under the same conditions, resulting in a promising specific capacity of 214.1 mAh g–1 (770.8 Fg–1) in 6M KOH solution at 0.5 A g–1. In addition, the capacitance of the symmetrical SC device assembled by G-HMC-1:3–80 reaches 179.8 Fg–1, coupled with an energy density of 24.86 Whkg–1 at 230 Wkg–1 power density. This work provides valuable hints for designing SC composite electrode materials with outstanding performance.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE; National Natural Science Foundation of China (NSFC); Scientific Research Fund of Liaoning Provincial Education Department
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
2428035
Journal Information:
Journal of Energy Storage, Journal Name: Journal of Energy Storage Vol. 92; ISSN 2352-152X
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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