Publication: Reagent-and solvent-mediated Fe2O3 morphologies and electrochemical mechanism of Fe2O3 supercapacitors
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Issued Date
2022
Resource Type
Language
eng
File Type
application/pdf
ISSN
9258388
Rights Holder(s)
Scopus
Bibliographic Citation
Journal of Food Processing and Preservation. Vol 46, No.8 (2022), p.-
Suggested Citation
Phakkhawan A., Suksangrat P., Srepusharawoot P., Ruangchai S., Klangtakai P., Pimanpang S., Amornkitbamrung V. Reagent-and solvent-mediated Fe2O3 morphologies and electrochemical mechanism of Fe2O3 supercapacitors. Journal of Food Processing and Preservation. Vol 46, No.8 (2022), p.-. doi:10.1016/j.jallcom.2022.165702 Retrieved from: https://hdl.handle.net/20.500.14740/9952
Abstract
A solvothermal technique was used to synthesize nine different ferric oxide (Fe2O3) morphologies: rhomb (R), flower (F), hollow sphere (HS), crystal (C), elongated hexagon (EH), hexagon (H), sugar apple (SA), sand/spherical particle (SSP) and mixed particle (MP). X-ray diffraction, high-resolution transmission electron microscopy and selected area electron diffraction reveal six of the nine powders to be composed of the pure α-Fe2O3 structure, whereas the EH-Fe2O3, H-Fe2O3 and SA-Fe2O3 powders contain the mixed α-Fe2O3/Fe3O4 structure. The F-Fe2O3 powder has the highest total specific pore volume (0.059 cm3 g−1), the largest average pore size (23.983 nm), and a high specific surface area (9.82 m2 g−1), which subsequently produce the highest specific capacitance of 218.49 F g−1. X-ray photoemission spectroscopy and energy dispersive spectroscopy detect H2O and K+ adsorption on the F-Fe2O3 electrode and the reduction of Fe3+ to Fe2+ in the charged state, whereas H2O molecules and K+ ions are released from the F-Fe2O3 electrode, and Fe2+ is oxidized to Fe3+ in the discharged state. The simulated K-inserted-α-Fe2O3 structure shows an increased electron density surrounding Fe atoms, which is indicative of Fe3+ reduction during the charged state. The F-Fe2O3 film is able to retain 76.81 % of its 20th cycle value after 1,000 cycles. Four series-supercapacitor coin cells constructed from the F-Fe2O3 anode and the MnO2 cathode deliver an outstanding energy density of 10.96 Wh kg−1 and power density of 0.461 kW kg−1. © 2022 Elsevier B.V.