Universität zu Köln

Luo, Lan, Zhou, Kaiqiang, Lian, Ruqian, Lu, Yanzhong, Zhen, Yichao, Wang, Jinshan, Mathur, Sanjay ORCID: 0000-0003-2765-2693 and Hong, Zhensheng (2020). Cation-deficient TiO2(B) nanowires with protons charge compensation for regulating reversible magnesium storage. Nano Energy, 72. AMSTERDAM: ELSEVIER. ISSN 2211-3282

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Abstract

Magnesium battery is a recently emerging energy storage system that has attracted considerable attention. However, its development is limited by the lack of proper electrode materials for reversible Mg2+ intercalation/de-intercalation with satisfied capacity. Here, we firstly report easy synthesis of Ti-deficient bronze titanium dioxide nanowires by topology transformation of H-titanate precursor. It's found OH anions substitution of O2- supports the formation of Ti vacancies in TiO2(B) with a high concentration, denoted as (Ti0.91O1.64(OH)(0.36)), and can be utilized as a robust host for Mg-ion storage. Both the theoretical and experimental study revealed that Ti-deficient TiO2(B) exhibits much improved electronic properties with unpaired electrons. Density functional theory (DFT) calculations also reveal Ti vacancies provide more feasible binding sites for Mg-ion. More importantly, it's surprisingly found the presence of protons enables a suitable binding energy for Mg-ion intercalation and extraction. As a result, such material displays discharge and charge capacities of 217.3 and 165.3 mA h g(-1) at 0.02 A g(-1), representing the highest value among the reported Ti-based electrode materials as well as a high initial Columbic efficiency up to 76.1%. This study gives a new and in-depth view on how cation-deficient structure regulates and promotes the reversible energy storage.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Luo, Lan UNSPECIFIED UNSPECIFIED UNSPECIFIED Zhou, Kaiqiang UNSPECIFIED UNSPECIFIED UNSPECIFIED Lian, Ruqian UNSPECIFIED UNSPECIFIED UNSPECIFIED Lu, Yanzhong UNSPECIFIED UNSPECIFIED UNSPECIFIED Zhen, Yichao UNSPECIFIED UNSPECIFIED UNSPECIFIED Wang, Jinshan UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, Sanjay UNSPECIFIED orcid.org/0000-0003-2765-2693 UNSPECIFIED Hong, Zhensheng UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-332437
DOI:	10.1016/j.nanoen.2020.104716
Journal or Publication Title:	Nano Energy
Volume:	72
Date:	2020
Publisher:	ELSEVIER
Place of Publication:	AMSTERDAM
ISSN:	2211-3282
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Inorganic Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MG-ION BATTERIES; LITHIUM-ION; TIO2-B NANOWIRES; ANODE MATERIAL; INSERTION; ALLOYS; BI Multiple languages Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/33243