Boosted lithium storage performance by local build-in electric field derived by oxygen vacancies in 3D holey N-doped carbon structure decorated with molybdenum dioxide

Hou, Chuanxin, Yang, Wenyue, Kimura, Hideo, Xie, Xiubo, Zhang, Xiaoyu, Sun, Xueqin, Yu, Zhipeng, Yang, Xiaoyang, Zhang, Yuping, Wang, Bin, Xu, Bin, Sridhar, Deepak, Algadi, Hassan, Guo, Zhanhu and Du, Wei (2023) Boosted lithium storage performance by local build-in electric field derived by oxygen vacancies in 3D holey N-doped carbon structure decorated with molybdenum dioxide. Journal of Materials Science and Technology, 142. pp. 185-195. ISSN 1005-0302

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Official URL: https://doi.org/10.1016/j.jmst.2022.10.007

Abstract

Three-dimensional holey nitrogen-doped carbon matrixes decorated with molybdenum dioxide (MoO2) nanoparticles have been successfully synthesized via a NaCl-assisted template strategy. The obtained MoO2/C composites offered multi-advantages, including higher specific surface area, more active sites, more ions/electrons transmission channels, and shorter transmission path due to the synergistic effect of the uniformly distributed MoO2 nanoparticles and porous carbon structure. Especially, the oxygen vacancies were introduced into the prepared composites and enhanced the Li+ intercalation/deintercalation process during electrochemical cycling by the Coulomb force. The existence of the local built-in electric field was proved by experimental data, differential charge density distribution, and density of states calculation. The uniquely designed structure and introduced oxygen vacancy defects endowed the MoO2/C composites with excellent electrochemical properties. In view of the synergistic effect of the uniquely designed morphology and introduced oxygen vacancy defects, the MoO2/C composites exhibited superior electrochemical performance of a high capacity of 918.2 mAh g–1 at 0.1 A g–1 after 130 cycles, 562.1 mAh g–1 at 1.0 A g–1 after 1000 cycles, and a capacity of 181.25 mAh g–1 even at 20.0 A g–1. This strategy highlights the path to promote the commercial application of MoO2-based and other transition metal oxide electrodes for energy storage devices.

Item Type: Article
Additional Information: Funding information: This work was supported by National Natural Science Foundation of China (52207249), the research program of Top Talent Project of Yantai University (1115/2220001), Yantai Basic Research Project (2022JCYJ04) and the Science Fund of Shandong Laboratory of Advanced Materials and Green Manufacturing (AMGM2021F11).
Uncontrolled Keywords: MoO2/C Hybrid, 3D Holey Structure, Oxygen Vacancies, Lithium-ion Batteries
Subjects: F200 Materials Science
H800 Chemical, Process and Energy Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: John Coen
Date Deposited: 26 Oct 2022 11:27
Last Modified: 30 Nov 2022 15:45
URI: https://nrl.northumbria.ac.uk/id/eprint/50464

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