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A hierarchical α-MoC₁₋ₓ hybrid nanostructure for lithium-ion storage
- Chen, Junmei, Huang, Yang, Zhao, Feipeng, Ye, Hualin, Wang, Yeyun, Zhou, Junhua, Liu, Yuping, Li, Yanguang
- Journal of materials chemistry A 2017 v.5 no.17 pp. 8125-8132
- carbides, electrochemistry, electrodes, energy, molybdenum, nanoparticles
- 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.