Unprecedented Capacity and Stability of Ammonium Ferrocyanide Catholyte in pH Neutral Aqueous Redox Flow Batteries
By Jian Luo, Bo Hu, Camden Debruler, Yujing Bi, Yu Zhao, Bing Yuan, Maowei Hu, Wenda Wu, T. L. Liu. Joule, 2019
228 citations recorded by the source corpus.
Summary Aqueous organic/organometallic redox flow batteries (AORFBs) have gained increasing attention for large-scale storage of intermittent renewable energy (e.g., solar and wind) due to the advantages of decoupled energy and power, high current and power performance, safety features, and synthetic tunability of charge storage molecules. Here, we report the synthesis and physicochemical properties of highly water-soluble (NH4)3[Fe(CN)6] and (NH4)4[Fe(CN)6] catholyte materials and their application in pH neutral AORFBs. A 1.5 M half-cell (NH4)3[Fe(CN)6]/(NH4)4[Fe(CN)6] redox flow battery confirmed the high capacity and stability of ammonium ferrocyanide catholyte at pH neutral conditions. Paired with 1,1′-bis(3-sulfonatopropyl)-4,4′-bipyridinium ((SPr)2V) anolyte, a 0.9 M symmetric (NH4)4[Fe(CN)6]/(SPr)2V AORFB free of supporting electrolytes exhibited excellent cycling performance including nearly 100% capacity retention in 1,000 cycles (1,100 testing hours), 62.6% energy efficiency at 40 mA/cm2 operation current density, and a power density of 72.5 mW/cm2, representing the most stable AORFB reported so far.
Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Renewable Energy, Sustainability and the Environment
View Paper: https://www.semanticscholar.org/paper/ac4a0ee6647343f743e9a211e7232419177237e2
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Citations in the corpus
- Redox flow batteries: Status and perspective towards sustainable stationary energy storage (2021, methodology): “Alternatively to the use of organic compounds at both half-cells low cost materials based catholytes have been equally explored as a more practical approach, e.g. bromine (1.51 V OCV, 0.227 W cm − 2 ) [122, 123], iodine [124] and iron [120].”
- A Water-Miscible Quinone Flow Battery with High Volumetric Capacity and Energy Density (2019, background): “Compared to strongly acidic or basic electrolytes, such less-corrosive electrolytes (pH 7−13) are preferable in terms of less expensive electrolyte-contacting materials and structural stability of redox-active species.(6,11,14,35) On the basis of the Pourbaix diagram in Figure 3b, the absence of a v”