Abstract
MXene has given great promises to supercapacitor electrode material due to its high conductivity and redox properties. However, the self-agglomeration of the MXene lamella will reduce its contact area with the electrolyte and generate a tortuous transportation pathway of the electrolyte ions, thereby reducing its capacitive performance and rate capability. In this work, we engineered the electrolyte ion channels by adjusting the MXene lamella size and inserting holey graphene (HG) nanosheets into the interlayer of the MXene flakes. The developed MXene/HG electrode can not only avoid the self-restacking of MXene but also provide unimpeded ion transport channels. As a result, the supercapacitive and rate performances of the small MXene lamella-based MXene/HG (S-MXene/HG) supercapacitor are prominently ameliorated. By adjusting the content of HG, the S-MXene/HG0.05 electrode exhibits excellent gravimetric capacitance of 446 F·g−1 and a rate capability of 77.5%. The S-MXene/HG0.05-based symmetric supercapacitor provides an impressive energy density of 14.84 Wh·kg−1 with excellent cyclic stability of 96% capacitance retention after 10,000 cycles. This demonstration of the engineering of the ion channels shows great potential in two-dimensional material-based supercapacitor electrodes.
Graphical abstract
摘要
MXene具有高导电性和氧化还原特性, 这一特性使其广泛应用于超级电容器的电极材料. 然而, MXene片层的自堆积会减少其与电解液的接触面积, 并产生曲折的电解液离子传输路径, 从而降低其电容性能和倍率性能。本文通过调整 MXene 片层尺寸并将多孔石墨烯 (HG) 纳米片插入 MXene 纳米片的层间来设计电解液离子传输通道。基于小片径 MXene的 MXene/HG (S-MXene/HG) 超级电容器的电容和倍率性能得到明显改善。 通过调节 HG 的含量, S-MXene/HG0.05 电极表现出优异的质量电容 (446 F·g-1)和倍率性能 (电容保持率为77.5%)。 基于 S-MXene/HG0.05 的对称式超级电容器提供了14.84 Wh·kg-1 能量密度, 并且在 10000 次循环后仍具有优异的循环稳定性 (电容保持率为96%)。 这种构建离子传输通道的方法在基于二维材料的超级电容器电极中显示出巨大的潜力。
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Acknowledgements
This study was financially supported by the National Key R&D Program of China (No. 2017YFA0304203), the National Natural Science Foundation of China (Nos. 21805174 and 51902190), the Key Research and Development Program of Shanxi Province for International Cooperation (No. 201803D421082), the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi (Nos. 2019L0013 and 2019L0018), Shanxi Scholarship Council of China (No. 2021-004), the Program of Introducing Talents of Discipline to Universities (No. D18001), the Changjiang Scholars and Innovative Research Team at the University of Ministry of Education of China (No. IRT_17R70) and the Fund for Shanxi “1331 Project.”
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Cai, Z., Ma, YF., Wang, M. et al. Engineering of electrolyte ion channels in MXene/holey graphene electrodes for superior supercapacitive performances. Rare Met. 41, 2084–2093 (2022). https://doi.org/10.1007/s12598-021-01935-6
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DOI: https://doi.org/10.1007/s12598-021-01935-6