Comparison of Nanoarchitecture to Porous Media Diffusion Models in Reduced Graphene Oxide/Aramid Nanofiber Electrodes for Supercapacitors
Comparison of Nanoarchitecture to Porous Media Diffusion Models in Reduced Graphene Oxide/Aramid Nanofiber Electrodes for Supercapacitors
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DOI：
10.1021/acsnano.9b07116
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发表时间：
2020-05-26
期刊：
影响因子：
17.1
通讯作者：
Ardebili, Haleh
中科院分区：
文献类型：
--
作者：
Aderyani, Sarah;Shah, Smit A.;Ardebili, Haleh
由还原氧化石墨烯（rGO）和芳纶纤维（ANF）制成的结构电极是未来结构超级电容器的有希望的候选者。在这项研究中，通过多物理场计算模型研究了纳米结构对rGO/ANF结构电极中的有效离子扩散率、孔隙率和弯曲度的影响。两个具体的纳米体系结构，即“纸牌屋”和“分层”结构，进行了评估。从纳米结构计算建模得到的结果相比，多孔介质的方法，并表明，广泛使用的多孔电极理论，如Bruggeman或Millington-Quirk关系，高估了有效的扩散系数。此外，从纳米结构建模的结果进行了验证，从电化学阻抗谱和循环伏安法获得的实验测量。从纳米结构建模获得的有效扩散系数显示出更好的协议与实验测量。通过实验和模拟评估微观性能，如孔隙率，弯曲度和有效扩散率，对于了解材料行为和提高其性能至关重要。
Structural electrodes made of reduced graphene oxide (rGO) and aramid nanofiber (ANF) are promising candidates for future structural supercapacitors. In this study, the influence of nanoarchitecture on the effective ionic diffusivity, porosity, and tortuosity in rGO/ANF structural electrodes is investigated through multiphysics computational modeling. Two specific nanoarchitectures, namely, "house of cards" and "layered" structures, are evaluated. The results obtained from nanoarchitecture computational modeling are compared to the porous media approach and show that the widely used porous electrode theories, such as Bruggeman or Millington-Quirk relations, overestimate the effective diffusion coefficient. Also, the results from nanoarchitecture modeling are validated with experimental measurements obtained from electro-chemical impedance spectroscopy and cyclic voltammetry. The effective diffusion coefficients obtained from nanoarchitectural modeling show better agreement with experimental measurements. Evaluation of microscopic properties such as porosity, tortuosity, and effective diffusivity through both experiment and simulation is essential to understand the material behavior and to improve its performance.