Abstract
The mesoporous Mo 3 N 2 nanowires exhibit a capacitance-dominated sodium-ion storage process, which enables the high-rate capabilities. Besides, the sodium-ion storage mechanism of mesoporous Mo 3 N 2 nanowires is surface redox reaction. Sodium-ion storage devices are highly desirable for large-scale energy storage applications owing to the wide availability of sodium resources and low cost. Transition metal nitrides (TMNs) are promising anode materials for sodium-ion storage, while their detailed reaction mechanism remains unexplored. Herein, we synthesize the mesoporous Mo 3 N 2 nanowires (Meso-Mo 3 N 2 -NWs). The sodium-ion storage mechanism of Mo 3 N 2 is systematically investigated through in-situ XRD, ex-situ experimental characterizations and detailed kinetics analysis. Briefly, the Mo 3 N 2 undergoes a surface pseudocapacitive redox charge storage process. Benefiting from the rapid surface redox reaction, the Meso-Mo 3 N 2 -NWs anode delivers high specific capacity (282 mAh g −1 at 0.1 A g −1 ), excellent rate capability (87 mAh g −1 at 16 A g −1 ) and long cycling stability (a capacity retention of 78.6% after 800 cycles at 1 A g −1 ). The present work highlights that the surface pseudocapacitive sodium-ion storage mechanism enables to overcome the sluggish sodium-ion diffusion process, which opens a new direction to design and synthesize high-rate sodium-ion storage materials.
Published Version
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