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Green Synthesis of Nitrogen-doped Porous Carbon Derived from Rice Straw for High-performance Supercapacitor Application
journal contribution
posted on 2020-06-29, 13:34 authored by Zenghua Xu, Ximing Zhang, Yue Liang, Hongjian Lin, Shen Zhang, Jianglong Liu, Caidi Jin, Ungyong Choe, Kuichuan ShengHierarchical structural carbon with
properly modulated compositions
and porosity is essential for energy storage capacity. Here, N-doped
porous carbon was synthesized using abundant rice straw under the
sequential hydrothermal treatment and calcination by KHCO3 in the presence of melamine. The activation with KHCO3 resulted in about a 50% increase in the yields of porous carbons
and performance comparable to that of KOH. The extra additional melamine
not only introduces the N-containing functional groups but also enhances
the mesoporosity and specific surface area (2786.5 m2 g–1). Meanwhile, wettability and conductivity are improved.
The obtained N-doped porous carbon exhibits outstanding capacitance
of 317 F g–1 at 1 A g–1. The fabricated
symmetric supercapacitor displays a stable cycling performance (99.4%
retention after 5000 cycles), a reasonable rate performance, and the
maximum specific energy of 18.4 W h kg–1. Our research
provides a promising method for effectively converting biowaste into
energy storage materials through green synthetic strategy.