Abstract
MXene nanomaterials are one of the most promising electrode material candidates for supercapacitors owing to their high conductivity, abundant surface functional groups and large surface area. However, electrodes based on MXene may result in low ion-accessible surface area and blocked ion transport pathways because of the self-restacking of MXene nanosheets. It is essential to suppress the self-restacking of nanosheets and increase the electrochemical active sites in order to optimize the electrode. In this work, bidirectionally aligned MXene hybrid aerogel (A-MHA) assembled with MXene nanosheets and microgels is prepared using a facile bidirectional freeze casting and freeze-drying method. The bidirectionally aligned structure together with the three-dimensional structured microgels in the A-MHAs, can improve the ion-accessible surface area and provide more barrier-free channels by exposing more active sites and ensuring electrolyte transport freely. The A-MHA with MXene microgels content of 40 wt% exhibits a high specific capacitance of 760 F·g−1 at 1 A·g−1 and a remarkable cyclic performance of 97% after 10,000 cycles at 100 mV·s−1 in 1 mol·L−1 H2SO4 electrolyte. A-MHAs show remarkable electrochemical properties and are of potential application in energy storage.
Graphical abstract
摘要
MXene纳米材料具有高导电性、丰富的表面官能团和大的比表面积等优点, 是最有前途的超级电容器电极材料之一。但由于MXene纳米片易于自堆积, 这将导致MXene电极离子可达表面积降低, 离子传输通路受阻等。因此, 可通过抑制纳米片的自堆积, 增加电化学活性位点等优化电极结构。本研究采用双向冷冻铸造和冷冻干燥的方法, 制备了由MXene纳米片和微凝胶组成的双取向气凝胶(aligned MXene hybrid aerogel, A-MHA)。在该A-MHAs中, 双取向结构与三维微凝胶结构的结合, 可暴露更多活性位点, 保证电解质在有序通道间自由传输, 提高离子可达表面积, 与材料内部充分反应。当MXene微凝胶含量为40 wt%时, AMHA在1 A·g−1电流密度下比电容高达760 F·g−1, 在1 mol·L−1 H2SO4电解液中, 100 mV·s−1扫速下循环10000次, 循环性能高达97%。A-MHAs具有优异的电化学性能, 在储能方面具有应用前景。
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Acknowledgements
This study was financially supported by the National Natural Science Foundation of China (No. 52002354) and China Postdoctoral Science Foundation (No. 2020M672256). The Center of Advanced Analysis & Gene Sequencing of Zhengzhou University was thanked for SEM testing.
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Li, PX., Guan, GZ., Shi, X. et al. Bidirectionally aligned MXene hybrid aerogels assembled with MXene nanosheets and microgels for supercapacitors. Rare Met. 42, 1249–1260 (2023). https://doi.org/10.1007/s12598-022-02189-6
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DOI: https://doi.org/10.1007/s12598-022-02189-6