Electrochemical functionalization of graphene nanosheets with iodoacetic acid towards supercapacitor electrodes

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem Pub Date : 2024-07-14 DOI:10.1016/j.flatc.2024.100710

Sergio García-Dalí, Daniel F. Carrasco, Silvia Villar-Rodil, Juan I. Paredes, Juan M.D. Tascón

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Abstract

Graphene nanosheets show great potential as electrode materials for supercapacitors due to their high surface area and excellent electrical conductivity. However, the low hydrophilicity of graphene nanosheets limits their electrochemical performance in aqueous supercapacitor applications. To enhance their electrochemical performance, we investigate the use of iodoacetic acid as an electrolytic functionalization agent for graphene nanosheets. Here, we demonstrate the successful electrolytic functionalization of graphene nanosheets under cathodic conditions in aqueous medium. The resulting material exhibits a high structural quality and carboxyl groups on the surface, which increases the hydrophilicity and wettability of the material. The applied voltage and the concentration of iodoacetic acid have been found to be key factors to optimize the process in order to get the maximum functionalization degree. The electrochemical performance demonstrates that iodoacetic acid functionalized graphene nanosheets exhibit significantly improved specific capacitance (220F/g at 0.5 A/g) and cycling stability of the symmetric cell compared to pristine graphene nanosheets, highlighting the potential of electrochemical functionalization to improve the performance of graphene-based materials in energy storage applications.

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用碘乙酸对石墨烯纳米片进行电化学功能化，使其用于超级电容器电极

石墨烯纳米片具有高比表面积和优异的导电性，因此作为超级电容器的电极材料显示出巨大的潜力。然而，石墨烯纳米片的低亲水性限制了其在水性超级电容器应用中的电化学性能。为了提高它们的电化学性能，我们研究了使用碘乙酸作为石墨烯纳米片的电解功能化剂。在此，我们展示了在水介质中的阴极条件下成功实现石墨烯纳米片的电解功能化。所得到的材料具有很高的结构质量，表面的羧基增加了材料的亲水性和润湿性。研究发现，为了获得最大的官能化程度，施加电压和碘乙酸浓度是优化工艺的关键因素。电化学性能表明，与原始石墨烯纳米片相比，碘乙酸功能化石墨烯纳米片的比电容（0.5 A/g时为220F/g）和对称电池的循环稳定性都有显著提高，凸显了电化学功能化在提高石墨烯基材料储能应用性能方面的潜力。

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来源期刊

FlatChem Multiple-

CiteScore

8.40

自引率

6.50%

发文量

104

审稿时长

26 days

期刊介绍： FlatChem - Chemistry of Flat Materials, a new voice in the community, publishes original and significant, cutting-edge research related to the chemistry of graphene and related 2D & layered materials. The overall aim of the journal is to combine the chemistry and applications of these materials, where the submission of communications, full papers, and concepts should contain chemistry in a materials context, which can be both experimental and/or theoretical. In addition to original research articles, FlatChem also offers reviews, minireviews, highlights and perspectives on the future of this research area with the scientific leaders in fields related to Flat Materials. Topics of interest include, but are not limited to, the following: -Design, synthesis, applications and investigation of graphene, graphene related materials and other 2D & layered materials (for example Silicene, Germanene, Phosphorene, MXenes, Boron nitride, Transition metal dichalcogenides) -Characterization of these materials using all forms of spectroscopy and microscopy techniques -Chemical modification or functionalization and dispersion of these materials, as well as interactions with other materials -Exploring the surface chemistry of these materials for applications in: Sensors or detectors in electrochemical/Lab on a Chip devices, Composite materials, Membranes, Environment technology, Catalysis for energy storage and conversion (for example fuel cells, supercapacitors, batteries, hydrogen storage), Biomedical technology (drug delivery, biosensing, bioimaging)