Abstract
High-performance energy storage devices are in increasing demand for the rapid development of social economy, among which supercapacitors stand out due to their high power density and long cycle life. Here, carbonized cellulose nanofibrils were used to form porous carbon aerogels. And nitrogen from urea was doped in the carbon aerogels to enhance the chemisorption ability and wettability of the surface of carbon materials. Afterwards, manganese oxide/nitrogen-doped carbon aerogels were fabricated through a simple hydrothermal reaction. The composites with a 1:40 mass ratio of carbon aerogels: urea (40-NCMn) showed a maximum specific capacitance of 275.5 F g−1 at 1 A g−1 and an acceptable rate performance of 65.4% when the current density increased 10 times. Using 40-NCMn for positive electrode and activated carbon (AC) for negative electrode, an asymmetric supercapacitor was assembled. It delivered a maximum energy density of 23.3 W h kg−1 and a power density of 600 W kg−1 at 0.5 A g−1. After 3000 cycles at 5 A g−1, it could retain 99.2% of the initial capacitance, implying the manganese oxide/nitrogen-doped carbon aerogel a promising material for supercapacitor electrodes.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.