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Nitrogen‐Doped Porous Carbon Nanosheets from Eco‐Friendly Eucalyptus Leaves as High Performance Electrode Materials for Supercapacitors and Lithium Ion Batteries
Author(s) -
Mondal Anjon Kumar,
Kretschmer Katja,
Zhao Yufei,
Liu Hao,
Wang Chengyin,
Sun Bing,
Wang Guoxiu
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201605019
Subject(s) - nanosheet , supercapacitor , materials science , electrolyte , anode , chemical engineering , lithium (medication) , carbon fibers , electrode , specific surface area , capacitance , electrochemistry , current collector , nanotechnology , composite material , chemistry , organic chemistry , composite number , catalysis , medicine , endocrinology , engineering
Nitrogen‐doped porous carbon nanosheets were prepared from eucalyptus tree leaves by simply mixing the leaf powders with KHCO 3 and subsequent carbonisation. Porous carbon nanosheets with a high specific surface area of 2133 m 2 g −1 were 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 −1 at a current density of 500 mA g −1 in 1 m H 2 SO 4 aqueous electrolyte and excellent cycling stability over 15 000 cycles. In organic electrolyte, the nanosheet electrode showed a specific capacitance of 71 F g −1 at a current density of 2 Ag −1 and 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 −1 at 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.