Influence of Hydrotropes on the Solubilities and Diffusivities of Redox-Active Organic Compounds for Aqueous Flow Batteries

被引:14
作者
Cheng, Yingchi [1 ]
Hall, Derek M. [2 ,3 ]
Boualavong, Jonathan [1 ]
Hickey, Robert J. [4 ]
Lvov, Serguei N. [4 ,5 ]
Gorski, Christopher A. [1 ]
机构
[1] Penn State Univ, Dept Civil & Environm Engn, University Pk, PA 16802 USA
[2] Penn State Univ, Dept Energy & Mineral Engn, University Pk, PA 16802 USA
[3] Penn State Univ, Earth & Mineral Sci Energy Inst, University Pk, PA 16802 USA
[4] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA
[5] Penn State Univ, Dept Energy & Mineral Engn, Earth & Mineral Sci Energy Inst, University Pk, PA 16802 USA
基金
美国国家科学基金会;
关键词
ELECTRON-TRANSFER; SOLUBILIZATION; WATER; ELECTROCHEMISTRY; NICOTINAMIDE; AGGREGATION; MECHANISM; BEHAVIOR; PACKAGE; DRUG;
D O I
10.1021/acsomega.1c05133
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
In this study, we explored the extent to which hydrotropes can be used to increase the aqueous solubilities of redox-active compounds previously used in flow batteries. We measured how five hydrotropes influenced the solubilities of five redox-active compounds already soluble in aqueous electrolytes (>= 0.5 M). The solubilities of the compounds varied as a function of hydrotrope type and concentration, with larger solubility changes observed at higher hydrotrope concentrations. 4-OH-TEMPO underwent the largest solubility increase (1.18 +/- 0.04 to 1.99 +/- 0.12 M) in 20 weight percent sodium xylene sulfonate. The presence of a hydrotrope in solution decreased the diffusion coefficients of 4-OH-TEMPO and 4,5-dihydroxy-1,3-benzenedisulfonate, which was likely due to the increased solution viscosity as opposed to a specific hydrotrope-solute interaction because the hydrotropes did not alter their molecules' hydraulic radii. The standard rate constants and formal potentials of both 4-OH-TEMPO and 4,5-dihydroxy-1,3-benzenedisulfonate remained largely unchanged in the presence of a hydrotrope. The results suggest that using hydrotropes may be a feasible strategy for increasing the solubilities of redox-active compounds in aqueous flow batteries without substantially altering their electrochemical properties.
引用
收藏
页码:30800 / 30810
页数:11
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