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An aqueous ZnCl 2 /Fe(bpy) 3 Cl 2 flow battery with mild electrolyte
Frontiers of Materials Science ( IF 2.5 ) Pub Date : 2020-09-29 , DOI: 10.1007/s11706-020-0523-7
Zhipeng Xie , Lulu Wei , Shengwen Zhong

The kinetics of electrode reaction was investigated by cyclic voltammetry, and cyclic voltammograms show that the reversibility of the Fe(bpy)32+/Fe(bpy)33+ electrode reaction is better than that of the Zn/Zn2+ electrode reaction on the graphite disc. However, the Fe(bpy)32+ ion diffusion in electrolyte is subject to greater resistance than that of the Zn2+ ion one. The stability of the Fe(bpy)3Cl2 solution was investigated by UV-vis spectroscopy, and the performance of a mild redox flow battery employing ZnCl2 and Fe(bpy)3Cl2 in the NaCl aqueous solution with various membranes as the separator was also investigated. It was found that the Celgard 3501 membrane cannot effectively prevent Fe(bpy)32+ ions from leaking into anolyte, leading to the rapid failure of the flow battery. Although the Nafion 115 membrane can be polluted by Fe(bpy)32+ ions, it is not invalidated. The Nafion 115 membrane shows good selectivity, which can avoid Fe(bpy)32+ ions from leakage into anolyte. The ZnCl2/Fe(bpy)3Cl2 flow battery with the Nafion 115 membrane exhibits the capacity retention of 80% after 200 cycles.



中文翻译:

具有温和电解质的ZnCl 2 / Fe(bpy)3 Cl 2液流电池

通过循环伏安法研究了电极反应的动力学,循环伏安图表明,Fe(bpy)3 2+ / Fe(bpy)3 3+电极反应的可逆性优于Zn / Zn 2+电极反应的可逆性在石墨盘上。然而,Fe(bpy)3 2+离子在电解质中的扩散比锌2+离子具有更大的电阻。通过紫外可见光谱研究了Fe(bpy)3 Cl 2溶液的稳定性,以及使用ZnCl 2和Fe(bpy)3 Cl 2的温和氧化还原液流电池的性能。还研究了在NaCl水溶液中使用各种膜作为隔膜的情况。已经发现,Celgard 3501膜不能有效地防止Fe(bpy)3 2+离子泄漏到阳极电解液中,从而导致液流电池快速失效。尽管Nafion 115膜可被Fe(bpy)3 2+离子污染,但它不会失效。Nafion 115膜具有良好的选择性,可以避免Fe(bpy)3 2 +离子泄漏到阳极液中。带有Nafion 115膜的ZnCl 2 / Fe(bpy)3 Cl 2液流电池在200个循环后显示出80%的容量保持率。

更新日期:2020-09-30
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