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A Flexible and Ultrahigh Energy Density Capacitor via Enhancing Surface/Interface of Carbon Cloth Supported Colloids
Author(s) -
Liang Xitong,
Chen Kunfeng,
Xue Dongfeng
Publication year - 2018
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.201703329
Subject(s) - pseudocapacitor , materials science , anode , colloid , cathode , electrode , carbon fibers , capacitor , supercapacitor , capacitance , power density , nanotechnology , chemical engineering , optoelectronics , composite material , voltage , power (physics) , electrical engineering , chemistry , physics , quantum mechanics , composite number , engineering
Pseudocapacitors are now reaching the energy density limits set by the surface redox reaction of their electrode materials, requiring new cation paradigms for a fast cation Faradaic reaction with high capacitance. In this work, a flexible and ultrahigh energy density capacitor is reported via enhancing surface/interface of active colloids and supported carbon cloth. A flexible asymmetrical capacitor assembled with Ni 2+ colloidal cathode and Fe 3+ colloidal anode displays a high energy density of 353 W h kg −1 at the power density of 2250 W kg −1 , outperforming recent reported pseudocapacitors, and shows superior cycling stability after 10 000 charge–discharge cycles at current density of 30 A g −1 . This work demonstrates that the optimized surface/interface of carbon cloth and colloids can lead to the enhancement of both stability and activity of colloidal electrode.