3D Printed MXene Aerogels with Truly 3D Macrostructure and Highly Engineered Microstructure for Enhanced Electrical and Electrochemical Performance
3D Printed MXene Aerogels with Truly 3D Macrostructure and Highly Engineered Microstructure for Enhanced Electrical and Electrochemical Performance
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DOI：
10.1002/adma.202104980
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发表时间：
2021-11
影响因子：
29.4
通讯作者：
H. Tetik;J. Orangi;Guang Yang;Keren Zhao;S. B. Mujib;Gurpreet Singh;M. Beidaghi;D. Lin
中科院分区：
文献类型：
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作者：
H. Tetik;J. Orangi;Guang Yang;Keren Zhao;S. B. Mujib;Gurpreet Singh;M. Beidaghi;D. Lin
使用3D打印技术将MXene等2D材料组装成功能性3D气凝胶，由于制造简单，定制几何形状和物理特性以及改进的性能而受到关注。此外，建立简单的电极制造方法，目的是阻止限制电极性能的电极材料的重新堆叠和/或聚集，这是非常重要的。在这项研究中，单向冷冻铸造和基于喷墨的3D打印相结合，以制造具有垂直排列的Ti 3C 2 Tx片的宏观多孔气凝胶。开发制造方法以容易地控制气凝胶微结构和MXene片材的对准。气凝胶显示出优异的机电性能，使得它们在恢复到原始形状之前可以承受几乎50%的压缩，并且在连续压缩循环期间保持其导电性。为了提高电化学性能，喷墨打印的MXene集流体层添加了水平排列的MXene片材。这将集电器层的上级导电性与由多孔电极提供的改进的离子扩散相结合。用水平MXene片对齐作为集流体与随后的垂直MXene片对齐层制造的电池显示出最佳的电化学性能，具有厚度无关的电容行为。
Assembling 2D materials such as MXenes into functional 3D aerogels using 3D printing technologies gains attention due to simplicity of fabrication, customized geometry and physical properties, and improved performance. Also, the establishment of straightforward electrode fabrication methods with the aim to hinder the restack and/or aggregation of electrode materials, which limits the performance of the electrode, is of great significant. In this study, unidirectional freeze casting and inkjet‐based 3D printing are combined to fabricate macroscopic porous aerogels with vertically aligned Ti3C2Tx sheets. The fabrication method is developed to easily control the aerogel microstructure and alignment of the MXene sheets. The aerogels show excellent electromechanical performance so that they can withstand almost 50% compression before recovering to the original shape and maintain their electrical conductivities during continuous compression cycles. To enhance the electrochemical performance, an inkjet‐printed MXene current collector layer is added with horizontally aligned MXene sheets. This combines the superior electrical conductivity of the current collector layer with the improved ionic diffusion provided by the porous electrode. The cells fabricated with horizontal MXene sheets alignment as current collector with subsequent vertical MXene sheets alignment layers show the best electrochemical performance with thickness‐independent capacitive behavior.