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Title: Performance-improved Li-O2 batteries by tailoring the phases of MoxC porous nanorods as an efficient cathode
Authors: Yu, Hong
Dinh, Khang Ngoc
Sun, Yuanmiao
Fan, Haosen
Wang, Yonghui
Jing, Yao
Li, Shuzhou
Srinivasan, Madhavi
Yan, Qingyu
Keywords: Engineering::Materials
Issue Date: 2018
Source: Yu, H., Dinh, K. N., Sun, Y., Fan, H., Wang, Y., Jing, Y., . . . Yan, Q. (2018). Performance-improved Li-O2 batteries by tailoring the phases of MoxC porous nanorods as an efficient cathode. Nanoscale, 10(31), 14877-14884. doi:10.1039/c8nr04319a
Journal: Nanoscale
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%.
ISSN: 2040-3364
DOI: 10.1039/c8nr04319a
Rights: © 2018 The Royal Society of Chemistry. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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