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Synthesis and electrochemical characterization of novel MOF-reduced graphene oxide composites

机译：新型MOF还原氧化石墨烯复合材料的合成与电化学表征

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Recently great interest has been drawn towards carbon materials that include graphene and similar 2D materials owing to their unique structural and physical properties. Graphene with its flat 2D structure possess reasonably large surface area and good electrical conductivity. These properties could specifically tune in combination with the other related materials by forming nanocomposites and thereby imparting novel as well as improved properties compared to their parent materials. Another class of materials, Metal-organic frameworks or MOFs are emerging as very interesting porous materials with extremely large internal surface area and tunable chemical properties. These materials are new generation porous crystalline materials suitably formed by the co-ordination of organic - inorganic moieties in a well-defined pattern. The organic linkers connected with metal centres provide them with extremely high surface area and ability to introduce variable functional groups. However, MOFs are generally insulators. It can be hypothesized that a combination of MOF with graphene will generate materials with large surface area and high electrical conductivity, which in turn may lead to the development of efficient supercapacitors. A few studies have investigated the MOF-carbon systems with the main focus towards materials for gas separation, gas storage and supercapacitor applications. Jahan et al. reported the structure directing role of reduced graphene oxide (RGO) in the synthesis of MOF5. Petit et al. synthesized several different novel composites based on a copper based MOF (HKUST-1) and RGO and studied the reactive adsorption of ammonia in order to characterize the mechanisms of the retention process. Guo et al. reported that composites synthesized using RGO and a platinum based MOF can be modified further to perform bioanalysis, biocatalysis and environmental monitoring. However, to the authors best knowledge there has not been any study to investigate whether MOF and RGO based composite materials can be used as supercapacitors. Hence, in the present study we have synthesized MOF5 and RGO composites with varying amounts of RGO and have investigated the electrochemical responses of these materials in 1 M sodium sulphate (Na_2SO_4) electrolyte.
机译：最近，由于其独特的结构和物理特性，人们对包括石墨烯和类似2D材料的碳材料引起了极大的兴趣。具有平坦2D结构的石墨烯具有相当大的表面积和良好的导电性。通过形成纳米复合材料，这些特性可以与其他相关材料组合进行特定的调整，从而与它们的母材相比可以赋予新颖的以及改进的特性。另一类材料是金属有机骨架或MOF，它们是非常有趣的多孔材料，具有极大的内表面积和可调节的化学特性。这些材料是新一代的多孔晶体材料，适合通过有机-无机部分的配合以清晰的图案形成。与金属中心相连的有机连接基为它们提供了极高的表面积，并能够引入可变的官能团。但是，MOF通常是绝缘体。可以假设，MOF与石墨烯的组合将产生具有大表面积和高导电率的材料，这反过来可能导致开发高效的超级电容器。一些研究已经对MOF碳系统进行了研究，其主要重点是用于气体分离，气体存储和超级电容器应用的材料。 Jahan等。报道了还原氧化石墨烯（RGO）在MOF5合成中的结构指导作用。 Petit等。基于铜基MOF（HKUST-1）和RGO合成了几种不同的新型复合材料，并研究了氨的反应性吸附，以表征保留过程的机理。郭等。据报道，使用RGO和基于铂的MOF合成的复合材料可以进一步改性以进行生物分析，生物催化和环境监测。然而，据作者所知，还没有任何研究来研究基于MOF和RGO的复合材料是否可以用作超级电容器。因此，在本研究中，我们合成了具有不同RGO量的MOF5和RGO复合材料，并研究了这些材料在1 M硫酸钠（Na_2SO_4）电解质中的电化学响应。

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