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Thin sandwich graphene oxide@N-doped carbon composites for high-performance supercapacitors

机译：用于高性能超级电容器的薄夹心氧化石墨烯@掺杂碳的碳复合材料

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Compositing graphene oxide (GO) with controllable secondary components is of great significance to achieve carbon materials with high-level physicochemical properties. In this study, thin sandwich composites of GO and N-doped carbon (GO@NdC) were fabricated through controllable deposition of polyvinyl dichloride (PVDC)-dehalogenated carbon on GO; this method exploited the high affinity between PVDC and GO. The thin deposited carbon layers on GO achieved the thicknesses ranging from 1.0 to 2.0 nm. Considering that dehalogenated carbon has been verified to be highly reactive for coupling heteroelements, an overall N content of ～7.0 at% was obtained with the addition of melamine as a N source. Moreover, the byproducts EtOH and NaCl could tune the composites into open 3D structures in situ, efficiently preventing the thin-layered composites from re-stacking. After activation with KOH, GO@NdC further demonstrated a hierarchical pore structure and large specific surface area. Remarkably, KOH-activated GO@NdC exhibited a high specific capacitance of ～354 F g?1 and a capacitance retention of >65% (at 10.0 A g?1). Finally, the GO@NdC symmetric supercapacitor also achieved a high specific energy of ～11.8 W h kg?1 in an aqueous alkaline electrolyte.
机译：具有可控次要成分的氧化石墨烯（GO）的复合对于获得具有高水平理化特性的碳材料具有重要意义。在这项研究中，GO和N掺杂碳（GO @ NdC）的薄夹心复合材料是通过可控制地在GO上沉积聚二氯乙烯（PVDC）脱卤的碳制成的。这种方法利用了PVDC和GO之间的高亲和力。在GO上沉积的薄碳层的厚度在1.0到2.0 nm之间。考虑到已证明脱卤碳对偶合杂元素具有高反应活性，通过添加三聚氰胺作为氮源，总氮含量约为7.0 at％。此外，副产物EtOH和NaCl可以将复合材料原位调整为开放的3D结构，从而有效地防止了薄层复合材料的重新堆叠。用KOH活化后，GO @ NdC进一步显示出分层的孔结构和较大的比表面积。值得注意的是，KOH活化的GO @ NdC表现出约354 F g ？1 的高比电容，电容保持率> 65％（在10.0 A g ？1 ）。最后，GO @ NdC对称超级电容器在碱性水溶液中也获得了约11.8 W h kg ？1 的高比能。

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