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Fluorine‐Doped Fe 2 O 3 as High Energy Density Electroactive Material for Hybrid Supercapacitor Applications
Author(s) -
Karthikeyan Kaliyappan,
Amaresh Samuthirapandian,
Lee Sol Nip,
Aravindan Vanchiappan,
Lee Yun Sung
Publication year - 2014
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201301289
Subject(s) - fluorine , supercapacitor , materials science , hematite , capacitance , x ray photoelectron spectroscopy , doping , analytical chemistry (journal) , electrochemistry , transmission electron microscopy , chemical engineering , electrode , nanotechnology , optoelectronics , metallurgy , chemistry , chromatography , engineering
Nanostructured α‐Fe 2 O 3 with and without fluorine substitution were successfully obtained by a green route, that is, microwave irradiation. The hematite phase materials were evaluated as a high‐performance electrode material in a hybrid supercapacitor configuration along with activated carbon (AC). The presence of fluorine was confirmed through X‐ray photoelectron spectroscopy and transmission electron microscopy. Fluorine‐doped Fe 2 O 3 (F‐Fe 2 O 3 ) exhibits an enhanced pseudocapacitive performance compared to that of the bare hematite phase. The F‐Fe 2 O 3 /AC cell delivered a specific capacitance of 71 F g −1 at a current density of 2.25 A g −1 and retained approximately 90 % of its initial capacitance after 15 000 cycles. Furthermore, the F‐Fe 2 O 3 /AC cell showed a very high energy density of about 28 W h kg −1 compared to bare hematite phase (∼9 W h kg −1 ). These data clearly reveal that the electrochemical performance of Fe 2 O 3 can be improved by fluorine doping, thereby dramatically improving the energy density of the system.