Citation: Xueli Guo, Liang Xiao, Pengfei Yan, Ming Li, Mingjun Zhu, Jinping Liu. Synergistic tuning of electrochemical surface area and surface Co³⁺ by oxygen plasma enhances the capacities of Co₃O₄ lithium-oxygen battery cathodes[J]. Chinese Chemical Letters, ;2021, 32(11): 3491-3495. doi: 10.1016/j.cclet.2021.03.066 shu

Synergistic tuning of electrochemical surface area and surface Co³⁺ by oxygen plasma enhances the capacities of Co₃O₄ lithium-oxygen battery cathodes

Xueli Guo ^a ,
Liang Xiao ^{a, d, *,} ,
Pengfei Yan ^c ,
Ming Li ^d ,
Mingjun Zhu ^a ,
Jinping Liu ^{a, b, *,}

a.
School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, China
b.
Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025, China
c.
Beijing Key Laboratory of Microstructure and Property of Solids, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China
d.
School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China

xiaoliang@whut.edu.cn

liujp@whut.edu.cn

liujpwhut@163.com

Received Date: 26 January 2021
Revised Date: 23 March 2021
Accepted Date: 24 March 2021
Available Online: 26 March 2021

Figures(4)

Modifying electrochemical surface area (ECSA) and surface chemistry are promising approaches to enhance the capacities of oxygen cathodes for lithium-oxygen (Li-O₂) batteries. Although various chemical approaches have been successfully used to tune the cathode surface, versatile physical techniques including plasma etching etc. could be more effortless and effective than arduous chemical treatments. Herein, for the first time, we propose a facile oxygen plasma treatment to simultaneously etch and modify the surface of Co₃O₄ nanosheet arrays (NAs) cathode for Li-O₂ batteries. The oxygen plasma not only etches Co₃O₄ nanosheets to enhance the ECSA but also lowers the oxygen vacancy concentration to enable a Co³⁺-rich surface. In addition, the NA architecture enables the full exposure of oxygen vacancies and surface Co³⁺ that function as the catalytically active sites. Thus, the synergistic effects of enhanced ECSA, modest oxygen vacancy and high surface Co³⁺ achieve a significantly enhanced reversible capacity of 3.45 mAh/cm² for Co₃O₄ NAs. This work not only develops a promising high-capacity cathode for Li-O₂ batteries, but also provides a facile physical method to simultaneously tune the nanostructure and surface chemistry of energy storage materials.
- Co₃O₄ nanosheet arrays,
- Oxygen plasma,
- Electrochemical surface area,
- Oxygen vacancy,
- Co³⁺-rich surface
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Synergistic tuning of electrochemical surface area and surface Co3+ by oxygen plasma enhances the capacities of Co3O4 lithium-oxygen battery cathodes

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通讯作者: 陈斌, bchen63@163.com

Synergistic tuning of electrochemical surface area and surface Co³⁺ by oxygen plasma enhances the capacities of Co₃O₄ lithium-oxygen battery cathodes