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Enhanced cyclability of Li–O2 battery with cathodes of Ir and MnO2 supported on well defined TiN array

Abstract

The cycling stability of Li–O2 batteries has been impeded by the lack of high-efficiency, and durable oxygen cathodes for the oxygen-reduction reaction (ORR) and oxygen-evolution reaction (OER). Herein we reported a novel TiN nanorod array-based cathode, which was firstly prepared by growing TiN nanorod array on the carbon paper (CP), and then followed by depositing MnO2 ultrathin sheets or Ir nanoparticles on the TiN nanorods to form well-ordered, three-dimensional (3D), and free-standing structured cathodes: TiN@MnO2/CP and TiN@Ir/CP. Both of the cathodes exhibited good specific capacities and excellent cycling stabilities. Their specific discharge capacities were up to 2637 and 2530 mA h g-1, respectively. After 200 cycles for 2000 hrs at current density of 100 mA g-1, no obvious decays were observed for TiN@MnO2/CP and TiN@Ir/CP cathodes, while significant decreases were observed after 80th and 30th cycles for Pt/C cathode and TiN/CP cathode, respectively. Such high performance can be ascribed to the 3D array structure with enough microspace and high surface area, which facilitated the high dispersion of active components and prevented the formation of large/irreversible Li2O2.

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Supplementary files

Publication details

The article was received on 09 Nov 2017, accepted on 02 Jan 2018 and first published on 03 Jan 2018


Article type: Paper
DOI: 10.1039/C7NR08358K
Citation: Nanoscale, 2018, Accepted Manuscript
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    Enhanced cyclability of Li–O2 battery with cathodes of Ir and MnO2 supported on well defined TiN array

    L. Leng, J. Li, X. Zeng, X. Tian, H. Song, Z. Cui, T. Shu, H. Wang, J. Ren and S. Liao, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C7NR08358K

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