Highly Self-Healable 3D Microsupercapacitor with MXene-Graphene Composite Aerogel.
Highly Self-Healable 3D Microsupercapacitor with MXene-Graphene Composite Aerogel.
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DOI：
10.1021/acsnano.7b07528
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发表时间：
2018-04
期刊：
影响因子：
17.1
通讯作者：
Yang Yue;Nishuang Liu;Yanan Ma;Siliang Wang;Weijie Liu;Cheng Luo;Hang Zhang;Feng Cheng;
中科院分区：
文献类型：
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作者：
Yang Yue;Nishuang Liu;Yanan Ma;Siliang Wang;Weijie Liu;Cheng Luo;Hang Zhang;Feng Cheng;
具有三维结构的高性能微型超级电容器（MSC）为提高储能能力提供了一条有效途径。针对三维结构的电极在实际应用中容易受到机械变形破坏的问题，采用自修复聚氨酯作为外壳，制备了一种由MXene（Ti3C2Tx）-石墨烯（reduced graphene oxide，rGO）复合气凝胶电极组成的自修复三维MSC。MXene-rGO复合气凝胶结合了rGO的大比表面积和MXene的高电导率，不仅可以防止片层结构的自堆叠，而且在一定程度上抵抗MXene的不良氧化。基于3D MXene-rGO气凝胶的MSC在1 mV s-1的扫描速率下提供34.6 mF cm-2的大面积比电容和出色的循环性能，在15000次循环中电容保持率高达91%。3D MSC具有出色的自愈能力，第五次自愈后比电容保持率为81.7%。这种自修复3D MSC的制备可以为设计和制造下一代长寿命多功能电子设备提供方法，以进一步满足可持续发展的要求。
High-performance microsupercapacitors (MSCs) with three-dimensional (3D) structure provide an effective approach to improve the ability of energy storage. Because the electrodes with 3D structure are generally easily destroyed under mechanical deformation in practical applications, we fabricated a self-healable 3D MSC consisting of MXene (Ti3C2T x)-graphene (reduced graphene oxide, rGO) composite aerogel electrode by wrapping it with a self-healing polyurethane as an outer shell. The MXene-rGO composite aerogel combining large specific surface area of rGO and high conductivity of the MXene can not only prevent the self-restacking of the lamella structure but also resist the poor oxidization of MXene to a degree. The MSC based on a 3D MXene-rGO aerogel delivers a large area specific capacitance of 34.6 mF cm-2 at a scan rate of 1 mV s-1 and an outstanding cycling performance with a capacitance retention up to 91% over 15 000 cycles. The 3D MSC presents an excellent self-healing ability with specific capacitance retention of 81.7% after the fifth healing. The preparation of this self-healable 3D MSC can provide a method for designing and manufacturing next-generation long-life multifunctional electronic devices further to meet the requirements of sustainable development.