Fluorine‐Doped Fe2O3 as High Energy Density Electroactive Material for Hybrid Supercapacitor Applications |
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| Authors: | Dr Kaliyappan Karthikeyan Samuthirapandian Amaresh Sol Nip Lee Dr Vanchiappan Aravindan Prof Yun Sung Lee |
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| Institution: | 1. Faculty of Applied Chemical Engineering, Chonnam National University, Gwang‐ju 500‐757 (Korea);2. Department of Mechanical and Materials Engineering, The University of Western Ontario, London, Ontario, N6A 5B9 (Canada);3. Energy Research Institute @ NTU (ERI@N), Nanyang Technological University, Research Techno Plaza, 50 Nanyang Drive, Singapore 637553 (Singapore) |
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| Abstract: | Nanostructured α‐Fe2O3 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 Fe2O3 (F‐Fe2O3) exhibits an enhanced pseudocapacitive performance compared to that of the bare hematite phase. The F‐Fe2O3/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‐Fe2O3/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 Fe2O3 can be improved by fluorine doping, thereby dramatically improving the energy density of the system. |
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| Keywords: | activated carbon energy storage fluorine doping hybrid supercapacitor iron oxide |
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