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The Influence of Porous Co/CeO1.88-Nitrogen-Doped Carbon Nanorods on the Specific Capacity of Li-O2 Batteries

  • Suyeon Hyun
    Suyeon Hyun
    Department of Energy Science & Engineering, Daegu Gyeongbuk Institute of Science & Technology (DGIST), Daegu 42988, Republic of Korea
    More by Suyeon Hyun
  • Vasu Kaker
    Vasu Kaker
    Department of Chemistry, United World College of South East Asia (UWCSEA), Singapore 528704, Singapore
    More by Vasu Kaker
  • Arumugam Sivanantham
    Arumugam Sivanantham
    Department of Energy Science & Engineering, Daegu Gyeongbuk Institute of Science & Technology (DGIST), Daegu 42988, Republic of Korea
  • Junhyung Hong
    Junhyung Hong
    Department of Energy Science & Engineering, Daegu Gyeongbuk Institute of Science & Technology (DGIST), Daegu 42988, Republic of Korea
  • , and 
  • Sangaraju Shanmugam*
    Sangaraju Shanmugam
    Department of Energy Science & Engineering, Daegu Gyeongbuk Institute of Science & Technology (DGIST), Daegu 42988, Republic of Korea
    *Email: [email protected]
Cite this: ACS Appl. Mater. Interfaces 2021, 13, 15, 17699–17706
Publication Date (Web):April 7, 2021
https://doi.org/10.1021/acsami.1c03095
Copyright © 2021 American Chemical Society
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Abstract

Li-O2 batteries are attracting considerable attention as a promising power source for electric vehicles as they have the highest theoretical energy density among reported rechargeable batteries. However, the low energy density and efficiency of Li-O2 batteries still act as limiting factors in real cell implementations. This study proposes the cathode structure engineering strategy by tuning the thickness of a catalyst layer to enhance the Li-O2 battery performance. The construction of the Li-O2 battery with a thinner porous cathode leads less parasitic reactions at the solid electrolyte interface, maximization of the catalyst utilization, and facile transport of oxygen gas into the cathode. A remarkably high specific capacity of 33,009 mAh g–1 and the extended electrochemical stability for 75 cycles at a 1000 mAh g–1 limited capacity and 100 mA g–1 were achieved when using the porous Co/CeO1.88-nitrogen-doped carbon nanorod cathode. Further, a high discharge capacity of 20,279 mAh g–1 was also achieved at a relatively higher current density of 300 mA g–1. This work suggests the ideal cathode structure and the feasibility of the Co/CeO1.88-nitrogen-doped carbon nanorod as the cathode material, which can minimize the areal cathode catalyst loading and maximize the gravimetric energy density.

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The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acsami.1c03095.

  • X-ray diffraction profiles of all catalysts; high-resolution XPS spectra of Co/CeO1.88-NCNR and Co-NCNR; FE-SEM images and the corresponding elemental mapping images of CeO2-NCNR, Co-NCNR, and NCNR catalysts; the FE-SEM EDS spectrum and the elemental mapping images; N2 adsorption–desorption isotherm curves and corresponding pore size distributions of Co/CeO1.88-NCNR; cyclic voltammetry curves of Co/CeO1.88-NCNR and NCNR electrodes; potential profile of the Li-O2 cell with a pure carbon paper electrode; potential profile of Li-O2 cells with different mass loadings of the Co/CeO1.88-NCNR electrode; rate capability of Li-O2 cells with different mass loadings of the Co/CeO1.88-NCNR electrode; EIS curves of the pristine, discharged, and charged Co/CeO1.88-NCNR electrode; XRD patterns of the pristine and 50th cycled Co/CeO1.88-NCNR electrode; and high-resolution XPS spectra of the Co/CeO1.88-NCNR electrode after the 50th cycle (PDF)

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