Tuning the oxygen vacancy of mixed multiple oxidation states nanowires for improving Li-air battery performance

Mengwei Yuan; Zemin Sun; Zhenglong Wu; Di Wang; Han Yang; Caiyun Nan; Huifeng Li; Wenkai Zhang; Genban Sun

doi:10.1016/j.jcis.2021.10.104

Tuning the oxygen vacancy of mixed multiple oxidation states nanowires for improving Li-air battery performance

J Colloid Interface Sci. 2022 Feb 15;608(Pt 2):1384-1392. doi: 10.1016/j.jcis.2021.10.104. Epub 2021 Oct 23.

Authors

Mengwei Yuan¹, Zemin Sun², Zhenglong Wu³, Di Wang², Han Yang², Caiyun Nan², Huifeng Li², Wenkai Zhang⁴, Genban Sun⁵

Affiliations

¹ Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, China; Department of Physics and Applied Optics Beijing Area Major Laboratory, Beijing Normal University, Beijing 100875, China.
² Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, China.
³ Analytical and Testing Center of BNU, Beijing Normal University, Beijing 100875, China.
⁴ Department of Physics and Applied Optics Beijing Area Major Laboratory, Beijing Normal University, Beijing 100875, China. Electronic address: wkzhang@bnu.edu.cn.
⁵ Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, China. Electronic address: gbsun@bnu.edu.cn.

PMID: 34739996
DOI: 10.1016/j.jcis.2021.10.104

Abstract

Mixed multiple oxidation states CoMoO₄ nanowires (electrocatalysts) with tunable intrinsic oxygen vacancies were fabricated. CoMoO₄ with proper oxygen vacancy can be employed to construct a Li-air battery with a high capacity and stable cyclability. This is possible because CoMoO₄ contains surface oxygen vacancies, which result in the unit of CoMo bond, that is important for electrocatalysts used in Li-air batteries. Both the experimental and theoretical results demonstrate that the surface oxygen vacancies containing CoMoO₄ nanowires have a higher electrocatalytic activity. This shows that the highly efficient electrocatalysts used for Li-air batteries were designed to modify the redox properties of the mixed metal oxide in the catalytic active sites. This successful material design led to an improved strategy for high oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) activities based on the fast formation and extinction of ORR products.

Keywords: CoMoO(4); Electrocatalyst; Li-air battery; Surface oxygen vacancy.