Super-tough MXene-functionalized graphene sheets
Super-tough MXene-functionalized graphene sheets
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DOI：
10.1038/s41467-020-15991-6
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发表时间：
2020-04
影响因子：
16.6
通讯作者：
Tianzhu Zhou;Chao Wu;Yanlei Wang;A. Tomsia;Mingzhu Li;E. Saiz;S. Fang;R. Baughman;Lei Jiang-
中科院分区：
文献类型：
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作者：
Tianzhu Zhou;Chao Wu;Yanlei Wang;A. Tomsia;Mingzhu Li;E. Saiz;S. Fang;R. Baughman;Lei Jiang-
柔性还原氧化石墨烯（rGO）片材正在考虑用于便携式电子设备和柔性储能系统。然而，rGO片材较差的机械性能和导电性是此类器件发展的限制因素。在这里，我们使用 MXene (M) 纳米片通过 Ti-O-C 共价键对氧化石墨烯片进行功能化，以获得 MrGO 片。 MrGO 片材通过共轭分子（1-氨基芘-二琥珀酰亚胺基辛二酸酯，AD）进行交联。 MXene 纳米片和 AD 分子的结合减少了石墨烯片内的空隙，改善了石墨烯片的排列，从而获得更高的致密性和高韧性。原位拉曼光谱和分子动力学模拟揭示了 Ti-O-C 共价键合、MXene 纳米片滑动和 π-π 桥接的协同界面相互作用机制。此外，基于我们的超坚韧 MXene 功能化石墨烯片的超级电容器提供了柔性超级电容器较高的能量和功率密度组合。
Flexible reduced graphene oxide (rGO) sheets are being considered for applications in portable electrical devices and flexible energy storage systems. However, the poor mechanical properties and electrical conductivities of rGO sheets are limiting factors for the development of such devices. Here we use MXene (M) nanosheets to functionalize graphene oxide platelets through Ti-O-C covalent bonding to obtain MrGO sheets. A MrGO sheet was crosslinked by a conjugated molecule (1-aminopyrene-disuccinimidyl suberate, AD). The incorporation of MXene nanosheets and AD molecules reduces the voids within the graphene sheet and improves the alignment of graphene platelets, resulting in much higher compactness and high toughness. In situ Raman spectroscopy and molecular dynamics simulations reveal the synergistic interfacial interaction mechanisms of Ti-O-C covalent bonding, sliding of MXene nanosheets, and π-π bridging. Furthermore, a supercapacitor based on our super-tough MXene-functionalized graphene sheets provides a combination of energy and power densities that are high for flexible supercapacitors.