A High Voltage Aqueous Zinc–Organic Hybrid Flow Battery
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- A High Voltage Aqueous Zinc–Organic Hybrid Flow Battery
- Park, Minjoon; Beh, Eugene S.; Fell, Eric M.; Jing, Yan; Kerr, Emily F.; De Porcellinis, Diana; Goulet, Marc‐Antoni; Ryu, Jaechan; Wong, Andrew A.; Gordon, Roy G.; Cho, Jaephil; Aziz, Michael J.
- Issue Date
- Wiley-VCH Verlag
- ADVANCED ENERGY MATERIALS, v.9, no.25, pp.1900694
- Water-soluble redox-active organic molecules have attracted extensive attention as electrical energy storage alternatives to redox-active metals that are low in abundance and high in cost. Here an aqueous zinc–organic hybrid redox flow battery (RFB) is reported with a positive electrolyte comprising a functionalized 1,4-hydroquinone bearing four (dimethylamino)methyl groups dissolved in sulfuric acid. By utilizing a three-electrolyte, two-membrane configuration this acidic positive electrolyte is effectively paired with an alkaline negative electrolyte comprising a Zn/[Zn(OH) 4 ] 2− redox couple and a hybrid RFB is operated at a high operating voltage of 2.0 V. It is shown that the electrochemical reversibility and kinetics of the organic redox species can be enhanced by an electrocatalyst, leading to a cyclic voltammetry peak separation as low as 35 mV and enabling an enhanced rate capability.
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