Interlayer Structure Engineering of MXene-Based Capacitor-Type Electrode for Hybrid Micro-Supercapacitor toward Battery-Level Energy Density,Advanced Science

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Interlayer Structure Engineering of MXene-Based Capacitor-Type Electrode for Hybrid Micro-Supercapacitor toward Battery-Level Energy Density
Advanced Science ( IF 14.3 ) Pub Date : 2021-06-17 , DOI: 10.1002/advs.202100775
Wenxiang Cheng ₁ , Jimin Fu ₂ , Haibo Hu _{1,

3} , Derek Ho ₃

Affiliation

Micro-supercapacitors are notorious for their low energy densities compared to micro-batteries. While MXenes have been identified as promising capacitor-type electrode materials for alternative zinc-ion hybrid micro-supercapacitors (ZHMSCs) with higher energy density, their tightly spaced layered structure renders multivalent zinc-ions with large radii intercalation inefficient. Herein, through insertion of 1D core-shell conductive BC@PPy nanofibers between MXene nanosheets, an interlayer structure engineering technique for MXene/BC@PPy capacitor-type electrodes towards ZHMSCs is presented. Owing to simultaneously achieving two objectives: (i) widening the interlayer space and (ii) providing conductive connections between the loose MXene layers, enabled by the conductive BC@PPy nanospacer, the approach effectively enhances both ion and electron transport within the layered MXene structure, significantly increasing the areal capacitance of the MXene/BC@PPy film electrode to 388 mF cm⁻², which is a 10-fold improvement from the pure MXene film electrode. Pairing with CNTs/MnO2 battery-type electrodes, the obtained ZHMSCs exhibit an areal energy density up to 145.4 μWh cm⁻² with an outstanding 95.8% capacity retention after 25000 cycles, which is the highest among recently reported MXene-based MSCs and approaches the level of micro-batteries. The interlayer structure engineering demonstrated in the MXene-based capacitor-type electrode provides a rational means to achieve battery-levelenergy density in the ZHMSCs.

中文翻译：

用于混合微型超级电容器的 MXene 基电容器型电极的层间结构工程，以实现电池级能量密度

与微型电池相比，微型超级电容器因其能量密度低而臭名昭著。虽然 MXene 已被认为是具有较高能量密度的替代锌离子混合微型超级电容器（ZHMSC）的有前景的电容器型电极材料，但其紧密间隔的层状结构使得大半径嵌入的多价锌离子效率低下。在此，通过在 MXene 纳米片之间插入一维核壳导电 BC@PPy 纳米纤维，提出了一种针对 ZHMSC 的 MXene/BC@PPy 电容器型电极的层间结构工程技术。由于同时实现了两个目标：（i）加宽层间空间和（ii）通过导电 BC@PPy 纳米间隔物在松散的 MXene 层之间提供导电连接，该方法有效增强了层状 MXene 结构内的离子和电子传输，将MXene/BC@PPy薄膜电极的面积电容显着提高至388 mF cm ^-2，比纯MXene薄膜电极提高了10倍。与CNT/MnO2电池型电极配合，所获得的ZHMSC表现出高达145.4 μWh cm ^-2的面能量密度，并且在25000次循环后具有出色的95.8%的容量保持率，这是最近报道的基于MXene的MSC中最高的，并且接近微型电池的水平。基于 MXene 的电容器型电极中展示的层间结构工程为在 ZHMSC 中实现电池级能量密度提供了合理的方法。

更新日期：2021-08-19

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