title: Nitrogen-Doped Porous Carbon Nanosheets from Eco-Friendly Eucalyptus Leaves as High Performance Electrode Materials for Supercapacitors and Lithium Ion Batteries.
abstract: Nitrogen-doped porous carbon nanosheets were prepared from eucalyptus tree leaves by simply mixing the leaf powders with KHCO3and subsequent carbonisation. Porous carbon nanosheets with a high specific surface area of 2133 m2g-1were obtained and applied as electrode materials for supercapacitors and lithium ion batteries. For supercapacitor applications, the porous carbon nanosheet electrode exhibited a supercapacitance of 372 F g-1at a current density of 500 mA g-1in 1 m H2SO4aqueous electrolyte and excellent cycling stability over 15 000 cycles. In organic electrolyte, the nanosheet electrode showed a specific capacitance of 71 F g-1at a current density of 2 Ag-1and stable cycling performance. When applied as the anode material for lithium ion batteries, the as-prepared porous carbon nanosheets also demonstrated a high specific capacity of 819 mA h g-1at a current density of 100 mA g-1, good rate capability, and stable cycling performance. The outstanding electrochemical performances for both supercapacitors and lithium ion batteries are derived from the large specific surface area, porous nanosheet structure and nitrogen doping effects. The strategy developed in this paper provides a novel route to utilise biomass-derived materials for low-cost energy storage systems.
authors.affiliation: Centre for Clean Energy Technology, School of Mathematical and Physical Sciences, University of Technology, Sydney, Broadway, Sydney, NSW, 2007, Australia.
authors.forename: Anjon Kumar
authors.initials: AK
authors.lastname: Mondal
authors.affiliation: Centre for Clean Energy Technology, School of Mathematical and Physical Sciences, University of Technology, Sydney, Broadway, Sydney, NSW, 2007, Australia.
authors.forename: Katja
authors.initials: K
authors.lastname: Kretschmer
authors.affiliation: Centre for Clean Energy Technology, School of Mathematical and Physical Sciences, University of Technology, Sydney, Broadway, Sydney, NSW, 2007, Australia.
authors.forename: Yufei
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: Centre for Clean Energy Technology, School of Mathematical and Physical Sciences, University of Technology, Sydney, Broadway, Sydney, NSW, 2007, Australia.
authors.forename: Hao
authors.initials: H
authors.lastname: Liu
authors.affiliation: College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou City, Jiangsu Province, 225002, P. R. China.
authors.forename: Chengyin
authors.initials: C
authors.lastname: Wang
authors.affiliation: Centre for Clean Energy Technology, School of Mathematical and Physical Sciences, University of Technology, Sydney, Broadway, Sydney, NSW, 2007, Australia.
authors.forename: Bing
authors.initials: B
authors.lastname: Sun
authors.affiliation: Centre for Clean Energy Technology, School of Mathematical and Physical Sciences, University of Technology, Sydney, Broadway, Sydney, NSW, 2007, Australia.
authors.forename: Guoxiu
authors.initials: G
authors.lastname: Wang
keywords: electrode material; lithium ion batteries; nitrogen doping; porous carbon nanosheets; supercapacitors