Department of Chemistry, Northeastern University, Shenyang, 110819, China.
Hebei Key Laboratory of Heavy Metal Deep-Remediation in Water and Resource Reuse, School of Environmental and Chemistry Engineering, Yanshan University, Qinhuangdao, 066004, China.
Angew Chem Int Ed Engl. 2023 Mar 20;62(13):e202216290. doi: 10.1002/anie.202216290. Epub 2023 Feb 15.
Rechargeable aqueous Zn-VO batteries are attracting attention in large scale energy storage applications. Yet, the sluggish Zn diffusion kinetics and ambiguous structure-property relationship are always challenging to fulfil the great potential of the batteries. Here we electrodeposit vanadium oxide nanobelts (VO-E) with highly disordered structure. The electrode achieves high capacities (e.g., ≈5 mAh cm , 516 mAh g ), good rate and cycling performances. Detailed structure analysis indicates VO-E is composed of integrated amorphous-crystalline nanoscale domains, forming an efficient heterointerface network in the bulk electrode, which accounts for the good electrochemical properties. Theoretical calculations indicate that the amorphous-crystalline heterostructure exhibits the favorable cation adsorption and lower ion diffusion energy barriers compared to the amorphous and crystalline counterparts, thus accelerating charge carrier mobility and electrochemical activity of the electrode.
可充电水系 Zn-VO 电池在大规模储能应用中引起了关注。然而，锌扩散动力学缓慢和结构-性能关系不明确一直是实现电池巨大潜力的挑战。在这里，我们用电沉积的方法制备了具有高度无序结构的氧化钒纳米带（VO-E）。该电极表现出高容量（例如，≈5 mAh cm ，516 mAh g ）、良好的倍率性能和循环性能。详细的结构分析表明，VO-E 由集成的无定形-结晶纳米尺度畴组成，在整个电极中形成了有效的异质界面网络，这是其具有良好电化学性能的原因。理论计算表明，与无定形和结晶相相比，无定形-结晶异质结构表现出有利的阳离子吸附和更低的离子扩散能垒，从而加速了电荷载流子的迁移率和电极的电化学活性。
