Journal
APPLIED SURFACE SCIENCE
Volume 529, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2020.147147
Keywords
Carboxymethylcellulose; Asymmetric supercapacitors; Microglobules; Pseudocapacitance
Categories
Funding
- Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea [20194030202320]
- Mid-career Researcher Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2019R1A2C2086747]
- National Research Foundation of Korea [4220200313627] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Nitrogen functionalized graphitic carbon (NGC), aside from being a distinctive support material for catalyst integration, is also intrinsically active for various electrochemical reactions especially in energy storage and conversion devices. Given the admirable conductivity and graded pore structure, the strategy of hybridizing metal oxides with NGC skeleton is reckoned to be highly compelling in the design of electrode materials. In this work, carboxy methylcellulose and melamine derived - Co3O4 NGC is used as an active electrode material for high performance asymmetric supercapacitors (ASC). The synthesized Co3O4 NGC exhibits microglobules with mesoporous network and maximum surface area of 445.3 m(2) g(-1) at 77 K. A solid state ASC is fabricated with activated carbon and Co3O4 NGC microglobules as negative and positive electrodes, respectively based on charge balancing theory, delivering ultra-high capacitance (128.43 F. g(-1)), energy density (45.66 Wh.kg(-1)) and power density (399.9 W.kg(-1)). Further, excellent capacitance retention (92.1%) over 5000 cycles confirms their longterm stability, which in turn enlightening the energy storage device progress for future generation electronics.
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