All-soluble all-iron aqueous redox-flow battery

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Issue Date
2016-07
Embargo End Date
Authors
Gong, Ke
Xu, Fei
Grunewald, Jonathan B.
Ma, Xiaoya
Zhao, Yun
Gu, Shuang
Yan, Yushan
Advisor
Citation

Ke Gong, Fei Xu, Jonathan B. Grunewald, Xiaoya Ma, Yun Zhao, Shuang Gu, and Yushan Yan. All-Soluble All-Iron Aqueous Redox-Flow Battery. ACS Energy Letters 2016 1 (1), 89-93

Abstract

The rapid growth of intermittent renewable energy (e.g., wind and solar) demands low-cost and large-scale energy storage systems for smooth and reliable power output, where redox-flow batteries (RFBs) could find their niche. In this work, we introduce the first all-soluble all-iron RFB based on iron as the same redox-active element but with different coordination chemistries in alkaline aqueous system. The adoption of the same redox-active element largely alleviates the challenging problem of cross-contamination of metal ions in RFBs that use two redox-active elements. An all-soluble all-iron RFB is constructed by combining an iron triethanolamine redox pair (i.e., Fe(TEOA)OH/Fe(TEOA)(OH)) and an iron cyanide redox pair (i.e., Fe(CN)(6)(3-)/Fe(CN)(6)(4-)), creating 1.34 V of formal cell voltage. Good performance and stability have been demonstrated, after addressing some challenges, including the crossover of the ligand agent. As exemplified by the all-soluble all-iron flow battery, combining redox pairs of the same redox-active element with different coordination chemistries could extend the spectrum of RFBs.

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