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Research Article

Ag doped urchin-like α-MnO2 toward efficient and bifunctional electrocatalysts for Li-O2 batteries

Linna Dai1, Qing Sun1, Lina Chen3( ), Huanhuan Guo1, Xiangkun Nie1, Jun Cheng1, Jianguang Guo1, Jianwei Li1, Jun Lou2( ), Lijie Ci1,3( )
Key Laboratory for Liquid-Solid Structural Evolution & Processing of Materials (Ministry of Education), Research Center for Carbon Nanomaterials, School of Materials Science and Engineering, Shandong University, Jinan 250061, China
Department of Materials Science and Nano Engineering, Rice University, Houston, Texas 77005, USA
School of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
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Graphical Abstract

Abstract

Rechargeable Li-O2 batteries (LOBs) have been receiving intensive attention because of their ultra-high theoretical energy density close to the gasoline. Herein, Ag modified urchin-like α-MnO2 (Ag-MnO2) material with hierarchical porous structure is obtained by a facile one-step hydrothermal method. Ag-MnO2 possesses thick nanowires and presents hierarchical porous structure of mesopores and macropores. The unique structure can expose more active sites, and provide continuous pathways for O2 and discharge products as well. The doping of Ag leads to the change of electronic distribution in α-MnO2 (i.e., more oxygen vacancies), which play important roles in improving their intrinsic catalytic activity and conductivity. As a result, LOBs with Ag-MnO2 catalysts exhibit lower overpotential, higher discharge specific capacity and much better cycle stability compared to pure α-MnO2. LOBs with Ag-MnO2 catalysts exhibit a superior discharge specific capacity of 13,131 mA·h·g-1 at a current density of 200 mA·g-1, a good cycle stability of 500 cycles at the capacity of 500 mA·h·g-1. When current density is increased to 400 mA·g-1, LOBs still retain a long lifespan of 170 cycles at a limited capacity of 1,000 mA·h·g-1.

Keywords

Li-O2 batteriesAg doped urchin-like MnO2electronic structurecycling stability

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Nano Research
Volume 13 Issue 9,
September 2020
Pages 2356-2364
DOI: 10.1007/s12274-020-2855-0
Cite this article:
Dai L, Sun Q, Chen L, et al. Ag doped urchin-like α-MnO2 toward efficient and bifunctional electrocatalysts for Li-O2 batteries. Nano Research, 2020, 13(9): 2356-2364. https://doi.org/10.1007/s12274-020-2855-0
Topics:
Air batteriesCatalyst activityElectrocatalystsLithiumLithium compoundsManganese oxidePorosity

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Received: 20 March 2020
Revised: 29 April 2020
Accepted: 06 May 2020
Published: 25 June 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
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