In Situ Electrochemical Synthesis of MXenes without Acid/Alkali Usage in/for an Aqueous Zinc Ion Battery,Advanced Energy Materials

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In Situ Electrochemical Synthesis of MXenes without Acid/Alkali Usage in/for an Aqueous Zinc Ion Battery
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2020-08-09 , DOI: 10.1002/aenm.202001791
Xinliang Li ₁ , Mian Li ₂ , Qi Yang ₁ , Guojin Liang ₁ , Zhaodong Huang ₁ , Longtao Ma ₁ , Donghong Wang ₁ , Funian Mo ₁ , Binbin Dong ₃ , Qing Huang ₂ , Chunyi Zhi _{1,

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Affiliation

The traditional method to fabricate a MXene based energy storage device starts from etching MAX phase particles with dangerous acid/alkali etchants to MXenes, followed by device assembly. This is a multistep protocol and is not environmentally friendly. Herein, an all‐in‐one protocol is proposed to integrate synthesis and battery fabrication of MXene. By choosing a special F‐rich electrolyte, MAX V₂AlC is directly exfoliated inside a battery and the obtained V₂CT_X MXene is in situ used to achieve an excellent battery performance. This is a one‐step process with all reactions inside the cell, avoiding any contamination to external environments. Through the lifetime, the device experiences three stages of exfoliation, electrode oxidation, and redox of V₂O₅. While the electrode is changing, the device can always be used as a battery and the performance is continuously enhanced. The resulting aqueous zinc ion battery achieves outstanding cycling stability (4000 cycles) and rate performance (97.5 mAh g⁻¹ at 64 A g⁻¹), distinct from all reported aqueous MXene‐based counterparts with pseudo‐capacitive properties, and outperforming most vanadium‐based zinc ion batteries with high capacity. This work sheds light on the green synthesis of MXenes, provides an all‐in‐one protocol for MXene devices, and extends MXenes’ application in the aqueous energy storage field.

中文翻译：

水溶液/锌离子电池中不使用酸/碱的MXenes的原位电化学合成

制造基于MXene的能量存储设备的传统方法始于用危险的酸/碱蚀刻剂将MAX相颗粒蚀刻为MXene，然后进行设备组装。这是一个多步骤协议，不环保。在此，提出了一种将MXene的合成和电池制造集成在一起的多合一协议。通过选择一种特殊的富F电解液，MAX V ₂ AlC会直接在电池内部剥落，然后将获得的V ₂ CT _X MXene直接用于电池，以实现出色的电池性能。这是一个一步的过程，所有反应都在电池内部，避免了对外部环境的任何污染。在整个生命周期中，器件经历了V的剥落，电极氧化和氧化还原三个阶段₂ O ₅。更换电极时，该设备始终可用作电池，并且性能不断提高。所得的水锌离子电池实现了卓越的循环稳定性（4000次循环）和倍率性能（97.5毫安克^-1在64 A G ^-1），从所有不同的报道伪电容特性水性MXene-副本，且优于大多数钒基于锌的高容量电池。这项工作阐明了MXene的绿色合成，为MXene设备提供了多合一协议，并扩展了MXene在水能存储领域的应用。

更新日期：2020-09-22

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