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Hybrid Iron Oxide on Three‐Dimensional Exfoliated Graphite Electrode with Ultrahigh Capacitance for Energy Storage Applications
Author(s) -
Sun Zhen,
Cai Xiang,
Feng DongYang,
Huang ZiHang,
Song Yu,
Liu XiaoXia
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201800143
Subject(s) - materials science , gravimetric analysis , capacitance , supercapacitor , anode , energy storage , electrode , oxide , mesoporous material , iron oxide , graphite , capacitive sensing , power density , horizontal scan rate , current density , nanotechnology , cathode , substrate (aquarium) , chemical engineering , optoelectronics , electrochemistry , cyclic voltammetry , electrical engineering , metallurgy , power (physics) , chemistry , catalysis , physics , biochemistry , oceanography , organic chemistry , quantum mechanics , geology , engineering
Electrode materials with low cost, large theoretical capacity, and fast ion/electron transport rate are highly desirable for capacitive applications. Pseudocapacitive iron oxide materials (e. g., Fe 2 O 3 , Fe 3 O 4 ) satisfy the first two aspects, but are electrically/ionically insulating, hindering their practical applications in energy storage. Here, hybrid mesoporous iron oxide (Fe 2 O 3 /Fe 3 O 4 ) materials are integrated with a three‐dimensional electrochemically exfoliated graphite substrate (EG) using an electrodeposition coupled with a post‐chemical transition strategy. The hybrid Fe 2 O 3 /Fe 3 O 4 materials on EG exhibit an ultrahigh specific capacitance of 1530 F g −1 at current density of 1 A g −1 . This material with such high capacitance ranks on the top of the reported iron oxide materials for capacitive applications. In addition, the assembled device with EG@Fe 2 O 3 /Fe 3 O 4 as anode can deliver a high gravimetric energy density of 21.6 Wh kg −1 at a power density of 225 W kg −1 , based on the total mass of the two electrodes (including the mass of the current collectors). This system can power various electronic devices, suggesting its great potential for energy storage applications.