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Nitrogen/Oxygen Enriched Hierarchical Porous Carbons Derived from Waste Peanut Shells Boosting Performance of Supercapacitors
Author(s) -
Wen Yanliang,
Chi Liang,
Wen Xin,
Chen Xuecheng,
Mijowska Ewa
Publication year - 2020
Publication title -
advanced electronic materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.25
H-Index - 56
ISSN - 2199-160X
DOI - 10.1002/aelm.202000450
Subject(s) - supercapacitor , materials science , electrolyte , specific surface area , gravimetric analysis , capacitance , chemical engineering , carbon fibers , porosity , energy storage , power density , nitrogen , oxygen , nanotechnology , catalysis , electrode , composite material , organic chemistry , chemistry , power (physics) , physics , quantum mechanics , composite number , engineering
The high specific surface area and the fine electrical conductivity are the vital impacts, but they are always a pair of mutually counterbalancing factors in carbon‐based supercapacitors. Herein, a facile strategy of the combined CoCl 2 catalytic graphitization and ZnCl 2 activation is applied to synthesize porous carbonaceous materials with enriched nitrogen and oxygen doping from a cheap and abundant biowaste of peanut shells. The as‐produced carbon materials possess high surface area (1745–2257 m 2 g −1 ), naturally nitrogen/oxygen co‐doping, and hierarchical porous structure. These physicochemical properties jointly endow these materials excellent supercapacitive performances: a high gravimetric specific capacitance of 343 F g −1 at 0.5 A g −1 and enduring long‐cycle performance of 90.9% capacitance retention after 10 000 cycles at 10 A g −1 in a 3‐electrode system with 6 m KOH electrolyte as well as a superior energy density of 42 Wh kg −1 at the high power density of 375 W kg −1 in an organic electrolyte. This low‐cost and facile approach shall open a new avenue to produce carbon materials with both high surface area and superior graphitization from the plentiful biomass for the potential energy storage applications.