Architecting Amorphous Vanadium Oxide/MXene Nanohybrid via Tunable Anodic Oxidation for High‐Performance Sodium‐Ion Batteries. Issue 22 (24th April 2021)

• Record Type: Journal Article
• Authors: Zhang, Wang; Peng, Jian; Hua, Weibo; Liu, Ying; Wang, Jinsong; Liang, Yaru; Lai, Weihong; Jiang, Yue; Huang, Yang; Zhang, Wei; Yang, Huiling; Yang, Yingguo; Li, Lina; Liu, Zhenjie; Wang, Lei; Chou, Shu‐Lei
• Is Part Of: Advanced energy materials. Volume 11:Issue 22(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-04-24
• Subjects: amorphous materials -- layered MXene -- nanohybrid -- sodium‐ion batteries -- tunable anodic oxidation -- vanadium oxide; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.202100757
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract: Structural engineering and creating atomic disorder in electrodes are promising strategies for highly efficient and rapid charge storage in advanced batteries. Herein, a nanohybrid architecture is presented with amorphous vanadium oxide conformally coated on layered V2 C MXene ( a ‐VO x /V2 C) via tunable anodic oxidation, which exhibits a high reversible capacity of 307 mAh g –1 at 50 mA g –1, decent rate capability with capacity up to 96 mAh g –1 at 2000 mA g –1, and good cycling stability as a cathode for sodium‐ion batteries. The a‐ VO x layer enables reversible and fast Na + insertion/extraction by providing sufficient vacancies and open pathways in the amorphous framework, unlike the irreversible phase transition in its crystalline counterpart, while layered V2 C MXene offers abundant electron/ion transfer channels, which are joined together to boost the electrochemical performance. Notably the improved reversibility and structural superiority of the a ‐VO x /V2 C nanohybrid are clearly revealed by in situ Raman, in situ transmission electron microscopy, in situ synchrotron X‐ray absorption spectroscopy, and density functional theory calculations, demonstrating a reversible V–O vibration and valence oscillation between V 4+ and V 5+ in the disordered framework, with robust structural stability and unobstructed Na + diffusion. This work provides a meaningful reference for the elaborate design of MXene‐based nanostructured electrodes toward advanced rechargeable batteries. Abstract : A nanohybrid structured electrode with amorphous vanadium oxide conformally coated on layered V2 C MXene is fabricated via tunable anodic oxidization in an aqueous electrolyte, which is joined together to provide sufficient vacancies and open pathways as well as abundant electron/ion transfer channels for highly efficient and rapid Na + storage in sodium‐ion batteries.