Premium
Spatial Charge Storage within Honeycomb‐Carbon Frameworks for Ultrafast Supercapacitors with High Energy and Power Densities
Author(s) -
Sheng Lizhi,
Jiang Lili,
Wei Tong,
Liu Zheng,
Fan Zhuangjun
Publication year - 2017
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.201700668
Subject(s) - supercapacitor , materials science , electrolyte , carbon fibers , energy storage , chemical physics , ion , chemical engineering , charge (physics) , nanotechnology , electrochemistry , electrode , power (physics) , composite material , chemistry , thermodynamics , physics , organic chemistry , composite number , engineering , quantum mechanics
Carbon‐based supercapacitors store charge through the adsorption of electrolyte ions onto the carbon surface. Therefore, it would be more attractive for the enhanced charge storage if the locations for storing charge can be extended from carbon surface to space. Here, a novel spatial charge storage mechanism based on counterion effect from Fe(CN) 6 3− ions bridged by oxygen groups and confined into honeycomb‐carbon frameworks is presented, which can provide additionally spatial charge storage for electrical double‐layer capacitances in a negative potential region and pseudocapacitances from Fe(CN) 6 3− /Fe(CN) 6 4− in a positive potential region. More importantly, an ultrafast supercapacitor based on this novelty carbon can be charged/discharged within 0.7 s to deliver both high specific energy of 15 W h kg −1 and ultrahigh specific power of 79.1 kW kg −1 in 1 m Na 2 SO 4 electrolyte, much higher than those of previously reported asymmetric supercapacitors in aqueous electrolytes, as well as excellent cycling stability. These features suggest a new generation of ultrafast asymmetric supercapacitors as novel high‐performance energy storage devices.