Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 231, Issue -, Pages 311-321Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2019.04.046
Keywords
Supercapacitor; Amaranthus; Direct carbonization; Nitric acid treatment; Capacitance
Categories
Funding
- Foundation of Jiangsu Key Lab of Biomass Energy and Material [JSBEM-S-201804]
- Fundamental Research Funds of Research Institute of Forest New Technology [CAFYBB2017SY031]
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With supercapacitors application promotion, looking for simple, energy efficient and environment-friendly method for expandable production of carbon materials with uniform heteroatoms doping as high-performance electrode materials for supercapacitors becomes the keystone of current research. Here, we present a simple, not costly, low environmental pollution method for preparation of nitrogen and oxygen dual-doped activated carbons via one step direct carbonization of natural, renewable and abundant amaranthus followed by ultrasonic treatment with nitric acid. Most noteworthy is XC-700-50, which exhibits high conductivity, moderate surface area, reasonable pore size distribution and high O and N doping contents (12.05% and 5.31% respectively). Benefiting from these features, it displays high gravimetric capacitance (326 F g(-1) and 294 F g(-1) at 0.5 A g(-1) and 1 A g(-1), respectively), good rate capability, as well as excellent cycling stability (about 97.1% and 94.4% of capacitance retention after 10000 cycles at 2 A g(-1) and 10 A g(-1), respectively) in the high mass loading electrode (8 mg cm(-2)), making it a promising electrode material for supercapacitors.
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