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Pore and Heteroatom Engineered Carbon Foams for Supercapacitors
Author(s) -
Peng Huarong,
Yao Bin,
Wei Xijun,
Liu Tianyu,
Kou Tianyi,
Xiao Peng,
Zhang Yunhuai,
Li Yat
Publication year - 2019
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201803665
Subject(s) - supercapacitor , materials science , heteroatom , electrode , capacitance , carbon fibers , mesoporous material , specific surface area , chemical engineering , power density , porosity , nanotechnology , energy storage , carbon nanofoam , composite material , organic chemistry , power (physics) , ring (chemistry) , chemistry , composite number , engineering , physics , quantum mechanics , catalysis
Abstract Carbonaceous materials are attractive supercapacitor electrode materials due to their high electronic conductivity, large specific surface area, and low cost. Here, a unique hierarchical porous N,O,S‐enriched carbon foam (KNOSC) with high level of structural complexity for supercapacitors is reported. It is fabricated via a combination of a soft‐template method, freeze‐drying, and chemical etching. The carbon foam is a macroporous structure containing a network of mesoporous channels filled with micropores. It has an extremely large specific surface area of 2685 m 2 g −1 . The pore engineered carbon structure is also uniformly doped with N, O, and S. The KNOSC electrode achieves an outstanding capacitance of 402.5 F g −1 at 1 A g −1 and superior rate capability of 308.5 F g −1 at 100 A g −1 . The KNOSC exhibits a Bode frequency at the phase angle of −45° of 18.5 Hz, which corresponds to a time constant of 0.054 s only. A symmetric supercapacitor device using KNOSC as electrodes can be charged/discharged within 1.52 s to deliver a specific energy density of 15.2 W h kg −1 at a power density of 36 kW kg −1 . These results suggest that the pore and heteroatom engineered structures are promising electrode materials for ultrafast charging.