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A hierarchical α-MoC1−x hybrid nanostructure for lithium-ion storage

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Abstract

Transition metal carbides are promising electrode materials for electrochemical energy storage, yet to unveil their full potential requires judicious structural engineering at the nanoscale. In this study, we report a chrysanthemum-inspired nanoscale design to prepare a three-dimensional hierarchical molybdenum carbide hybrid. It consisted of an ensemble of numerous nanoflakes protruding out from the center, each formed by ultra-small (∼2 nm) α-MoC1−x nanoparticles uniformly supported on a N-doped carbonaceous support. Such a hybrid material has enlarged surface areas, shortened ionic diffusion length, great mechanical robustness, and buffer room for electrode volume change. Owing to the three-dimensional hierarchical arrangement, this hybrid material exhibits impressive performance toward active lithium-ion storage. It delivers a large reversible capacity of >1000 mA h g−1, great rate capacity with significant capacity at 10 A g−1, and excellent cycling stability with >95% capacity retention after 100 cycles at 500 mA g−1. Most impressively, we demonstrate that the structural integrity of the hybrid microflower is largely preserved even after prolonged cycling.

Graphical abstract: A hierarchical α-MoC1−x hybrid nanostructure for lithium-ion storage

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Publication details

The article was received on 10 Feb 2017, accepted on 30 Mar 2017 and first published on 30 Mar 2017


Article type: Paper
DOI: 10.1039/C7TA01256J
Citation: J. Mater. Chem. A, 2017, Advance Article
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    A hierarchical α-MoC1−x hybrid nanostructure for lithium-ion storage

    J. Chen, Y. Huang, F. Zhao, H. Ye, Y. Wang, J. Zhou, Y. Liu and Y. Li, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA01256J

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