Zhang Junxuan, You Jie, Wei Qing, Han Jeong-In, Liu Zhiming
Flexible Display and Printed Electronics Laboratory, Department of Chemical and Biochemical Engineering, Dongguk University-Seoul, Seoul 04620, Republic of Korea.
Shandong Engineering Laboratory for Preparation and Application of High-Performance Carbon-Materials, College of Electromechanical Engineering, Qingdao University of Science & Technology, Qingdao 266061, China.
Nanomaterials (Basel). 2023 Jun 30;13(13):1986. doi: 10.3390/nano13131986.
We report an environment-friendly preparation method of rGO-based flexible self-supporting membrane electrodes, combining Co-MOF with graphene oxide and quickly preparing a hollow CoO@rGO flexible self-supporting membrane composite with a porous structure. This unique hollow porous structure can shorten the ion transport path and provide more active sites for lithium ions. The high conductivity of reduced graphene oxide further facilitates the rapid charge transfer and provides sufficient buffer space for the hollow Co-MOF nanocubes during the charging process. We evaluated its electrochemical performance in a coin cell, which showed good rate capability and cycling stability. The CoO@rGO flexible electrode maintains a high specific capacity of 1103 mAh g after 600 cycles at 1.0 A g. The high capacity of prepared material is attributed to the synergistic effect of the hollow porous structure and the 3D reduced graphene oxide network. This would be considered a promising new strategy for synthesizing hollow porous-structured rGO-based self-supported flexible electrodes.
我们报道了一种基于rGO的柔性自支撑膜电极的环保制备方法，将钴基金属有机框架（Co-MOF）与氧化石墨烯相结合，快速制备出具有多孔结构的中空CoO@rGO柔性自支撑膜复合材料。这种独特的中空多孔结构可以缩短离子传输路径，并为锂离子提供更多活性位点。还原氧化石墨烯的高导电性进一步促进了快速电荷转移，并在充电过程中为中空Co-MOF纳米立方体提供了足够的缓冲空间。我们在扣式电池中评估了其电化学性能，结果显示出良好的倍率性能和循环稳定性。在1.0 A g的电流密度下循环600次后，CoO@rGO柔性电极保持1103 mAh g的高比容量。所制备材料的高容量归因于中空多孔结构与三维还原氧化石墨烯网络的协同效应。这将被认为是合成基于rGO的中空多孔结构自支撑柔性电极的一种有前景的新策略。
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