Journal
AIP ADVANCES
Volume 10, Issue 6, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/5.0011862
Keywords
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Funding
- South African Research Chairs Initiative (SARChI) of the Department of Science and Technology
- National Research Foundation (NRF) of South Africa [61056]
- University of Pretoria
- NRF through SARChI in Carbon Technology and Materials
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In this work, a birnessite-type MnO2/carbon composite with hierarchical nanostructures was synthesized using KMnO4 solution and spent printing carbon grains. A hybrid electrochemical supercapacitor device was fabricated based on the birnessite-type MnO2-carbon composite electrode and carbonized iron-polyaniline/nickel graphene foam as positive and negative electrodes, respectively. At the lowest specific current of 1.0 A g(-1) and cell potential of 2.2 V in 2.5M KNO3 electrolyte, the device displayed a high energy and power density of 34.6 W h kg(-1) and 1100.0 W kg(-1), respectively. The device further displayed long-term cycling stability with a capacitance retention of 98% over 10 000 galvanostatic charge-discharge cycles at 10 A g(-1). This device displays the overall excellent electrochemical performance.
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