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Hybrid Electrospun Nanofibers as Electrocatalyst for Vanadium Redox Flow Batteries: Theory and Experiment
ChemElectroChem ( IF 4 ) Pub Date : 2020-12-14 , DOI: 10.1002/celc.202001380
Mahboubeh Maleki 1 , Tim Tichter 1 , Gumaa A. El‐Nagar 1, 2, 3 , Iver Lauermann 3 , Christina Roth 1, 4
Affiliation  

Selective modification of the morphology and intrinsic electrocatalytic activity of porous electrodes is urgently required to improve the performance of vanadium redox flow batteries (VRFBs). For this purpose, electrospinning was exploited to prepare high‐performance nanofiber‐based composites. Blends of polyacrylonitrile, polyacrylic acid, and polyaniline with carbon black were electrospun into a 3D free‐standing nanofibrous web, which was utilized as a novel electrode. By extending the recent theory of cyclic voltammetry at porous electrodes to account for interfacial double‐layer capacities, nonlinear effects of ohmic resistances, and parasitic reactions, we could quantitatively investigate non‐faradaic as well as desired and undesired faradaic current contributions. Combination of experimental and theoretical studies allowed a unique quantitative assessment of the intrinsic catalytic activity of selected electrode materials concerning the VO2+/VO2+ redox reaction.

中文翻译:

混合电纺纳米纤维作为钒氧化还原液流电池的电催化剂:理论与实验

迫切需要对多孔电极的形态和固有电催化活性进行选择性修饰,以改善钒氧化还原液流电池(VRFB)的性能。为此,利用静电纺丝技术制备了高性能的纳米纤维基复合材料。将聚丙烯腈,聚丙烯酸酯和聚苯胺与炭黑的混合物静电纺丝成3D独立式纳米纤维网,将其用作新型电极。通过扩展最近在多孔电极上的循环伏安理论来考虑界面双层容量,欧姆电阻的非线性效应和寄生反应,我们可以定量研究非法拉第以及期望的和不期望的法拉第电流贡献。2 + / VO 2+氧化还原反应。
更新日期:2021-01-08
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