用于超级电容器的 MXene 和过渡金属氧化物的异质结构：概述,Nanoscale

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用于超级电容器的 MXene 和过渡金属氧化物的异质结构：概述
Nanoscale ( IF 5.8 ) Pub Date : 2023-08-08 , DOI: 10.1039/d3nr01755a
Shagufi Naz Ansari _{1,

2} , Mohit Saraf ₃ , Zahir Abbas ₁ , Shaikh M Mobin _{1,

4}

Affiliation

MXene 是一大类二维 (2D) 材料，具有高电导率、氧化还原活性和成分多样性，已成为各种储能应用材料领域的领跑者。高性能超级电容器需要电极材料具有高电荷存储能力、用于快速电子传输的优异导电性以及快速充放电能力和良好的循环性能。虽然 MXene 表现出许多这些特性，但由于阳极电位下的不可逆氧化，它们的储能能力受到狭窄的电化学稳定电位窗口的限制。尽管过渡金属氧化物（TMO）通常是具有高氧化还原活性的高容量材料，但由于它们在水性电解质中溶解且电导率平庸，其循环性能和较差的倍率性能是持续存在的挑战。用 TMO 形成 MXene 异质结构并使用混合电极是同时提高 MXene 电荷存储容量并提高氧化物循环性能和倍率性能的可行方法。MXene 还可以充当氧化物生长的导电基底，氧化物可以充当间隔物，以阻止 MXene 片在充电/放电过程中聚集，并有助于提高超级电容器的性能。此外，TMO 可以增加 MXene 片之间的界面接触，并有助于提供短扩散离子通道。因此，MXene/TMO异质结构在储能方面具有广阔的前景。本综述总结了超级电容器 MXene/氧化物异质结构的最新进展，并强调了各个组件的作用。

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Heterostructures of MXenes and transition metal oxides for supercapacitors: an overview

MXenes are a large family of two dimensional (2D) materials with high conductivity, redox activity and compositional diversity that have become front-runners in the materials world for a diverse range of energy storage applications. High-performing supercapacitors require electrode materials with high charge storage capabilities, excellent electrical conductivity for fast electron transfer, and the ability of fast charging/discharging with good cyclability. While MXenes show many of these properties, their energy storage capability is limited by a narrow electrochemically stable potential window due to irreversible oxidation under anodic potentials. Although transition metal oxides (TMOs) are often high-capacity materials with high redox activity, their cyclability and poor rate performance are persistent challenges because of their dissolution in aqueous electrolytes and mediocre conductivity. Forming heterostructures of MXenes with TMOs and using hybrid electrodes is a feasible approach to simultaneously increase the charge storage capacity of MXenes and improve the cyclability and rate performance of oxides. MXenes could also act as conductive substrates for the growth of oxides, which could perform as spacers to stop the aggregation of MXene sheets during charging/discharging and help in improving the supercapacitor performance. Moreover, TMOs could increase the interfacial contact between MXene sheets and help in providing short-diffusion ion channels. Hence, MXene/TMO heterostructures are promising for energy storage. This review summarizes the most recent developments in MXene/oxide heterostructures for supercapacitors and highlights the roles of individual components.

更新日期：2023-08-08

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