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Issue 31, 2018
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Performance-improved Li-O2 batteries by tailoring the phases of MoxC porous nanorods as an efficient cathode

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Abstract

Novel nitrogen-doped porous molybdenum carbide (α-MoC1−x and β-Mo2C) architectures were prepared using Mo-based metal–organic frameworks (MOFs) as the precursor. The synthesized molybdenum carbides consist of numerous nanocrystals organized into micro-sized rods with interpenetrating mesoporous-channels and macroporous-tunnels along the axial direction. When employed as the cathode catalyst for Li-O2 batteries, this dual pore configuration offers abundant active sites for the electrochemical reaction and many nucleation sites for the discharge product of Li2O2; hence, decent performances were obtained. Among the two synthesized molybdenum carbides, the α-MoC1−x electrode stands out as being better due to its lower charge transfer resistance (395.8 Ω compared to 627.9 Ω) and better O2 adsorption (binding energy of −1.87 eV of α-(111)-Mo compared to −0.72 eV of β-(101)-Mo). It delivered a high full discharge of 20 212 mA h g−1 with a discharge voltage of 2.62 V at 200 mA g−1. A good cycling stability was also obtained: i.e. 100 stable cycles with a fixed capacity of 1000 mA h g−1 (at a current density of 200 mA g−1) with a charging voltage of 4.24 V and maintaining a respectable round-trip efficiency of ∼70%.

Graphical abstract: Performance-improved Li-O2 batteries by tailoring the phases of MoxC porous nanorods as an efficient cathode

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Publication details

The article was received on 28 May 2018, accepted on 10 Jul 2018 and first published on 11 Jul 2018


Article type: Paper
DOI: 10.1039/C8NR04319A
Citation: Nanoscale, 2018,10, 14877-14884
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    Performance-improved Li-O2 batteries by tailoring the phases of MoxC porous nanorods as an efficient cathode

    H. Yu, K. N. Dinh, Y. Sun, H. Fan, Y. Wang, Y. Jing, S. Li, M. Srinivasan and Q. Yan, Nanoscale, 2018, 10, 14877
    DOI: 10.1039/C8NR04319A

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