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Pyrolysis of Enzymolysis‐Treated Wood: Hierarchically Assembled Porous Carbon Electrode for Advanced Energy Storage Devices
Author(s) -
Wang Feng,
Cheong Jun Young,
Lee Jiyoung,
Ahn Jaewan,
Duan Gaigai,
Chen Huiling,
Zhang Qian,
Kim IlDoo,
Jiang Shaohua
Publication year - 2021
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202101077
Subject(s) - supercapacitor , materials science , pyrolysis , electrode , energy storage , porosity , cellulose , specific surface area , carbon fibers , mesoporous material , chemical engineering , nanotechnology , electrochemistry , composite material , organic chemistry , catalysis , composite number , chemistry , power (physics) , physics , quantum mechanics , engineering
Designing energy storage devices from thick carbon electrodes with high areal/volumetric energy density via a simple and green way is very attractive but still challenging. Cellulose, as an excellent precursor for thick carbon electrodes with abundant sources and low cost, is usually activated by a chemical activator and pyrolysis route to achieve high electrochemical performance. However, there are still some problems to be addressed, such as the harsh activation conditions, easy collapse of porous structures, and the high cost. Herein, a 3D self‐supporting thick carbon electrode derived from wood‐based cellulose is proposed for high areal and volumetric energy density of supercapacitor from a mild, simple, and green enzymolysis treatment. Benefiting from the high specific surface area (1418 m 2 g −1 ) and abundant active sites on the surface of wood‐derived hierarchically porous structures and enzymolysis‐induced micropores and mesopores, the assembled symmetry supercapacitor from the thick carbon electrode can realize the high areal/volumetric energy density of 0.21 mWh cm −2 /0.99 mWh cm −3 with excellent stability of 86.58% after 15 000 long‐term cycles at 20 mA cm −2 . Significantly, the simple and universal strategy to design material with high specific surface area, provides a new research idea for realizing multi‐functional application.