Vertically Aligned Binder-Free TiO2 Nanotube Arrays Doped with Fe, S and Fe-S for Li-ion Batteries

Vertically aligned Fe, S, and Fe-S doped anatase TiO2 nanotube arrays are prepared by an electrochemical anodization process using an organic electrolyte in which lactic acid is added as an additive. In the electrolyte, highly ordered TiO2 nanotube layer...

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Autores principales:	Suriyakumar Dasarathan, Mukarram Ali, Tai-Jong Jung, Junghwan Sung, Yoon-Cheol Ha, Jun-Woo Park, Doohun Kim
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	Li-ion batteries binder-free electrodes TiO<sub>2</sub> nanotube arrays electrochemical anodization elemental doping Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/6decf2190e9747b0804cea66065174ae
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spelling	oai:doaj.org-article:6decf2190e9747b0804cea66065174ae2021-11-25T18:30:53ZVertically Aligned Binder-Free TiO<sub>2</sub> Nanotube Arrays Doped with Fe, S and Fe-S for Li-ion Batteries10.3390/nano111129242079-4991https://doaj.org/article/6decf2190e9747b0804cea66065174ae2021-10-01T00:00:00Zhttps://www.mdpi.com/2079-4991/11/11/2924https://doaj.org/toc/2079-4991Vertically aligned Fe, S, and Fe-S doped anatase TiO<sub>2</sub> nanotube arrays are prepared by an electrochemical anodization process using an organic electrolyte in which lactic acid is added as an additive. In the electrolyte, highly ordered TiO<sub>2</sub> nanotube layers with greater thickness of 12 μm, inner diameter of approx. 90 nm and outer diameter of approx. 170 nm are successfully obtained. Doping of Fe, S, and Fe-S via simple wet impregnation method substituted Ti and O sites with Fe and S, which leads to enhance the rate performance at high discharge C-rates. Discharge capacities of TiO<sub>2</sub> tubes increased from 0.13 mAh cm<sup>−2</sup>(bare) to 0.28 mAh cm<sup>−2</sup> for Fe-S doped TiO<sub>2</sub> at 0.5 C after 100 cycles with exceptional capacity retention of 85 % after 100 cycles. Owing to the enhancement of thermodynamic and kinetic properties by doping of Fe-S, Li-diffusion increased resulting in remarkable discharge capacities of 0.27 mAh cm<sup>−2</sup> and 0.16 mAh cm<sup>−2</sup> at 10 C, and 30 C, respectively.Suriyakumar DasarathanMukarram AliTai-Jong JungJunghwan SungYoon-Cheol HaJun-Woo ParkDoohun KimMDPI AGarticleLi-ion batteriesbinder-free electrodesTiO<sub>2</sub> nanotube arrayselectrochemical anodizationelemental dopingChemistryQD1-999ENNanomaterials, Vol 11, Iss 2924, p 2924 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Li-ion batteries binder-free electrodes TiO<sub>2</sub> nanotube arrays electrochemical anodization elemental doping Chemistry QD1-999
spellingShingle	Li-ion batteries binder-free electrodes TiO<sub>2</sub> nanotube arrays electrochemical anodization elemental doping Chemistry QD1-999 Suriyakumar Dasarathan Mukarram Ali Tai-Jong Jung Junghwan Sung Yoon-Cheol Ha Jun-Woo Park Doohun Kim Vertically Aligned Binder-Free TiO<sub>2</sub> Nanotube Arrays Doped with Fe, S and Fe-S for Li-ion Batteries
description	Vertically aligned Fe, S, and Fe-S doped anatase TiO<sub>2</sub> nanotube arrays are prepared by an electrochemical anodization process using an organic electrolyte in which lactic acid is added as an additive. In the electrolyte, highly ordered TiO<sub>2</sub> nanotube layers with greater thickness of 12 μm, inner diameter of approx. 90 nm and outer diameter of approx. 170 nm are successfully obtained. Doping of Fe, S, and Fe-S via simple wet impregnation method substituted Ti and O sites with Fe and S, which leads to enhance the rate performance at high discharge C-rates. Discharge capacities of TiO<sub>2</sub> tubes increased from 0.13 mAh cm<sup>−2</sup>(bare) to 0.28 mAh cm<sup>−2</sup> for Fe-S doped TiO<sub>2</sub> at 0.5 C after 100 cycles with exceptional capacity retention of 85 % after 100 cycles. Owing to the enhancement of thermodynamic and kinetic properties by doping of Fe-S, Li-diffusion increased resulting in remarkable discharge capacities of 0.27 mAh cm<sup>−2</sup> and 0.16 mAh cm<sup>−2</sup> at 10 C, and 30 C, respectively.
format	article
author	Suriyakumar Dasarathan Mukarram Ali Tai-Jong Jung Junghwan Sung Yoon-Cheol Ha Jun-Woo Park Doohun Kim
author_facet	Suriyakumar Dasarathan Mukarram Ali Tai-Jong Jung Junghwan Sung Yoon-Cheol Ha Jun-Woo Park Doohun Kim
author_sort	Suriyakumar Dasarathan
title	Vertically Aligned Binder-Free TiO<sub>2</sub> Nanotube Arrays Doped with Fe, S and Fe-S for Li-ion Batteries
title_short	Vertically Aligned Binder-Free TiO<sub>2</sub> Nanotube Arrays Doped with Fe, S and Fe-S for Li-ion Batteries
title_full	Vertically Aligned Binder-Free TiO<sub>2</sub> Nanotube Arrays Doped with Fe, S and Fe-S for Li-ion Batteries
title_fullStr	Vertically Aligned Binder-Free TiO<sub>2</sub> Nanotube Arrays Doped with Fe, S and Fe-S for Li-ion Batteries
title_full_unstemmed	Vertically Aligned Binder-Free TiO<sub>2</sub> Nanotube Arrays Doped with Fe, S and Fe-S for Li-ion Batteries
title_sort	vertically aligned binder-free tio<sub>2</sub> nanotube arrays doped with fe, s and fe-s for li-ion batteries
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/6decf2190e9747b0804cea66065174ae
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Vertically Aligned Binder-Free TiO<sub>2</sub> Nanotube Arrays Doped with Fe, S and Fe-S for Li-ion Batteries

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