期刊
ADVANCED ENERGY MATERIALS
卷 9, 期 25, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201900694
关键词
aqueous flow batteries; electrocatalysts; energy storage; quinone; zinc
类别
资金
- U.S. Department of Energy (DOE) through Pacific Northwest National Laboratory (PNNL) [DE-AC05-76RL01830, 428977]
- Innovation Fund Denmark via the Grand Solutions project ORBATS [7046-00018B]
- Massachusetts Clean Energy Technology Center
- Ulsan National Institute of Science and Technology (UNIST) [1.180019.01]
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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