碳异凝胶、氧化石墨烯和纳米氧化锌在水性和有机超级电容器中的协同组合

IF 5.1 4区 材料科学 Q2 ELECTROCHEMISTRY
Rusbel Coneo-Rodríguez, Alvaro Yamil Tesio, Fernando Pablo Cometto, Gustavo Marcelo Morales, Gabriel Ángel Planes, Alvaro Caballero
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引用次数: 0

摘要

通过一种简便的方法合成了三维碳异凝胶,其中包括同时使用氧化锌纳米结构作为间苯二酚-甲醛树脂聚合的模板剂和催化剂。在干燥和热解过程中,氧化石墨烯(GO)可作为稳定剂,避免结构坍塌并改善面积表面。这种方法使获得的材料具有优化的三维多孔结构,可用于储能装置,如导线或意大利面条状结构。此外,在不使用额外活化剂的情况下,还获得了很高的 BET 表面积(1661 m2-g-1)。与不含 GO 的材料(358.1 F-g-1 对 170.4 F-g-1)相比,如此大的表面积提高了比电容。由间苯二酚甲醛树脂、GO 和氧化锌制成的含碳器件比不含 GO 的器件性能更好。特别是合成过程中含有 2.5% GO 的样品,在 0.5 A-g-1 时的比电容为 166.6 F-g-1,在 5 A-g-1 时保持在 120 F-g-1 左右。此外,在 0.5 A-g-1 时,它还显示出有趣的能量密度值(14.8 Wh-kg-1)和 200.7 W-kg-1 的功率密度。这表明,该合成工艺可以在不使用超临界干燥工艺的情况下获得大表面积的复合材料。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Synergetic Combination of Carbon Xerogels, Graphene Oxide and nano-ZnO for Aqueous and Organic Supercapacitors

Synergetic Combination of Carbon Xerogels, Graphene Oxide and nano-ZnO for Aqueous and Organic Supercapacitors

Three-dimensional carbon xerogels were synthesised via a facile approach that included the use of ZnO nanostructures both as a templating agent and as a catalyst for resorcinol–formaldehyde resin (R−F) polymerisation simultaneously. Graphene oxide (GO) served as a stabilising agent during the drying and pyrolysis processes, avoiding the collapse of structure and improving the area surface. The method enabled the as-obtained materials to possess optimised 3D porous structures for energy-storage devices, such as wires or spaghetti-like structures. Also, a high BET surface area was obtained (1661 m2 g−1) without using an additional activating agent. This great surface area improved the specific capacitance compared to materials without GO (358.1 F g−1 vs 170.4 F g−1). The carbon-containing devices derived from resorcinol-formaldehyde resin, GO, and Zn oxide showed better performance than the devices without GO. In particular, the sample that contained 2.5 % of GO in the synthesis showed a specific capacitance of 166.6 F g−1 at 0.5 A g−1 and remained at ∼120 F g−1 at 5 A g−1 current density. Also, it showed interesting energy density values at 0.5 A g−1 (14.8 Wh kg−1) and a power density of 200.7 W kg−1. This reveals that the synthesis process made it possible to obtain composite materials with large surface areas without using a supercritical drying process. The materials can be used in supercapacitor-type devices with high performance in aqueous electrolytes.

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来源期刊
CiteScore
8.60
自引率
5.30%
发文量
223
期刊介绍: Electrochemical energy storage devices play a transformative role in our societies. They have allowed the emergence of portable electronics devices, have triggered the resurgence of electric transportation and constitute key components in smart power grids. Batteries & Supercaps publishes international high-impact experimental and theoretical research on the fundamentals and applications of electrochemical energy storage. We support the scientific community to advance energy efficiency and sustainability.
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