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首页> 外文期刊>Chemistry: A European journal >Hybrid hydrogels of porous graphene and nickel hydroxide as advanced supercapacitor materials
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Hybrid hydrogels of porous graphene and nickel hydroxide as advanced supercapacitor materials

机译：多孔石墨烯和氢氧化镍作为高级超级电容器材料的混合水凝胶

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摘要

Graphene-based hydrogels can be used as supercapacitor electrodes because of their excellent conductivity, their large surface area and their high compatibility with electrolytes. Nevertheless, the large aspect ratio of graphene sheets limits the kinetics of processes occurring in the electrode of supercapacitors. In this study, we have introduced in-plane and out-of-plane pores into a graphene-nickel hydroxide (Ni(OH)_2) hybrid hydrogel, which facilitates charge and ion transport in the electrode. Due to its optimised chemistry and architecture, the hybrid electrode demonstrates excellent electrochemical properties with a combination of high charge storage capacitance, fast rate capability and stable cycling performance. Remarkably, the Ni(OH)_2 in the hybrid contributes a capacitance as high as 3138.5F g~(-1), which is comparable to its theoretical capacitance, suggesting that such structure facilitates effectively charge-transfer reactions in electrodes. This work provides a facile pathway for tailoring the porosity of graphene-based materials for improved performances. Moreover, this work has also furthered our understanding in the effect of pore and hydrogel structures on the electrochemical properties of materials.
机译：基于石墨烯的水凝胶具有出色的导电性，大的表面积以及与电解质的高度相容性，因此可以用作超级电容器电极。然而，石墨烯片的高纵横比限制了超级电容器电极中发生的过程的动力学。在这项研究中，我们已将面内和面外孔引入石墨烯-氢氧化镍（Ni（OH）_2）杂化水凝胶中，这有助于电极中的电荷和离子传输。由于其优化的化学和结构，该混合电极表现出出色的电化学性能，同时具有高电荷存储电容，快速速率能力和稳定的循环性能。值得注意的是，杂化体中的Ni（OH）_2贡献了高达3138.5F g〜（-1）的电容，这与其理论电容相当，表明这种结构有助于电极中的有效电荷转移反应。这项工作为定制石墨烯基材料的孔隙率以提高性能提供了一条简便的途径。此外，这项工作也使我们进一步了解了孔和水凝胶结构对材料电化学性能的影响。

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