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Superior Pseudocapacitive Behavior of Confined Lignin Nanocrystals for Renewable Energy‐Storage Materials
Author(s) -
Kim SungKon,
Kim Yun Ki,
Lee Hyunjoo,
Lee Sang Bok,
Park Ho Seok
Publication year - 2014
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201301061
Subject(s) - pseudocapacitor , supercapacitor , energy storage , renewable energy , materials science , nanotechnology , graphene , capacitance , nanocrystal , redox , pseudocapacitance , chemical engineering , electrode , chemistry , electrical engineering , power (physics) , physics , quantum mechanics , metallurgy , engineering
Strong demand for high‐performance energy‐storage devices has currently motivated the development of emerging capacitive materials that can resolve their critical challenge (i.e., low energy density) and that are renewable and inexpensive energy‐storage materials from both environmental and economic viewpoints. Herein, the pseudocapacitive behavior of lignin nanocrystals confined on reduced graphene oxides (RGOs) used for renewable energy‐storage materials is demonstrated. The excellent capacitive characteristics of the renewable hybrid electrodes were achieved by synergizing the fast and reversible redox charge transfer of surface‐confined quinone and the interplay with electron‐conducting RGOs. Accordingly, pseudocapacitors with remarkable rate and cyclic performances (∼96 % retention after 3000 cycles) showed a maximum capacitance of 432 F g −1 , which was close to the theoretical capacitance of 482 F g −1 and sixfold higher than that of RGO (93 F g −1 ). The chemical strategy delineated herein paves the way to develop advanced renewable electrodes for energy‐storage applications and understand the redox chemistry of electroactive biomaterials.