Journal
ELECTROCHIMICA ACTA
Volume 370, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2021.137739
Keywords
Mn3O4; Nitrogen-doped reduced graphene oxide; Supramolecular; Electrochemical activation; Supercapacitor
Categories
Funding
- National Natural Science Foundation of China [21673086]
- Scientific and Technological Plan of Guangdong Province
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The study investigates the fabrication and electrochemical activation process of Mn3O4 anchored nitrogen-doped reduced graphene oxide, showing that the activation process improves the specific capacitance of the electrode and enhances cycle stability.
Mn3O4 anchored nitrogen-doped reduced graphene oxide is fabricated via a facile hydrothermal route by using the Mn2+-GO supramolecular system as precursor and the ammonia as precipitant and nitrogen source. A combined characterization method including UV-vis absorption spectrum, fluorescence spectrum, and zeta potential and particle sizing measurement is adopted to study the interactions between Mn2+ and GO nanosheets. More importantly, the electrochemical activation process of the Mn3O4/N-rGO electrode in 1 mol L-1 Na2SO4 is investigated in detail. It is found that the activation process originates from the conversion of structure and morphology from spinel Mn3O4 to nano-structured birnessite MnO2. The activation process mainly occurs in the first 200 cycles, in which the specific capacitance increases by 88.2%. The electrochemical experimental results indicate that the Mn3O4/N-rGO electrode after the activation process exhibits improved capacitive performances with a specific capacitance of 141 F g(-1) at 0.2 A g(-1) and a superior cycle stability (90.3% capacitance retention after 50 0 0 cycles). This study will give a further insight into the distinctive electrochemical activation process and the supercapacitive properties of Mn3O4-based materials. (C) 2021 Elsevier Ltd. All rights reserved.
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