Hybridization of Fe-O in iron doped hydroxyapatite for superior electrochemical charge storage

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题名:	Hybridization of Fe-O in iron doped hydroxyapatite for superior electrochemical charge storage
作者:	K. Pannerselvam, A. R warrier, K. T. Kumar, R. Ranjitha, R. Subashchandrabose, Y.C. Huang, K. T. Arul, C. L. Dong, and K. Asokan, R. Jayapalan
日期:	2023-11-05
上传时间:	2024-07-31 12:11:31 (UTC+8)
出版者:	Elsevier
摘要:	Hydroxyapatite (HAp) is an interesting phosphate candidate with a weak electrical conductivity that can be tuned by doping metal ions to enhance the active sites for electrochemical charge storage. HAp and Fe-doped HAp were prepared by a wet chemical method. On doping, the crystallite size reduces to 9.56 nm. The surface area of 0.01FH (0.01% Fe) is 152.17 m2/g which is ∼3 times higher compared to PH. The 0.01FH sample shows the highest specific capacitance of 351.3 F/g at 30 mA/g. While X-ray photoemission spectroscopy shows the oxidation states of Fe in 2+ and 3+, X-ray absorption indicates (i) the enhancement of unoccupied density of states of Fe, and (ii) reduced interatomic distance of Fe-O in 0.01FH. These results show that the augmentation of surface properties and hybridization of Fe-O and the modification of its local atomic structures are responsible for high electrochemical charge storage in 0.01FH.
關聯:	Journal of Molecular Structure 1291, 135950
DOI:	10.1016/j.molstruc.2023.135950
显示于类别:	[電機工程學系暨研究所] 期刊論文

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