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Influence of Hydrotropes on the Solubilities and Diffusivities of Redox-Active Organic Compounds for Aqueous Flow Batteries
[Image: see text] 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 aq...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2021
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8600646/ https://www.ncbi.nlm.nih.gov/pubmed/34805708 http://dx.doi.org/10.1021/acsomega.1c05133 |
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author | Cheng, Yingchi Hall, Derek M. Boualavong, Jonathan Hickey, Robert J. Lvov, Serguei N. Gorski, Christopher A. |
author_facet | Cheng, Yingchi Hall, Derek M. Boualavong, Jonathan Hickey, Robert J. Lvov, Serguei N. Gorski, Christopher A. |
author_sort | Cheng, Yingchi |
collection | PubMed |
description | [Image: see text] 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. |
format | Online Article Text |
id | pubmed-8600646 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-86006462021-11-19 Influence of Hydrotropes on the Solubilities and Diffusivities of Redox-Active Organic Compounds for Aqueous Flow Batteries Cheng, Yingchi Hall, Derek M. Boualavong, Jonathan Hickey, Robert J. Lvov, Serguei N. Gorski, Christopher A. ACS Omega [Image: see text] 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. American Chemical Society 2021-11-01 /pmc/articles/PMC8600646/ /pubmed/34805708 http://dx.doi.org/10.1021/acsomega.1c05133 Text en © 2021 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/). |
spellingShingle | Cheng, Yingchi Hall, Derek M. Boualavong, Jonathan Hickey, Robert J. Lvov, Serguei N. Gorski, Christopher A. Influence of Hydrotropes on the Solubilities and Diffusivities of Redox-Active Organic Compounds for Aqueous Flow Batteries |
title | Influence of Hydrotropes on the Solubilities and Diffusivities
of Redox-Active Organic Compounds for Aqueous Flow Batteries |
title_full | Influence of Hydrotropes on the Solubilities and Diffusivities
of Redox-Active Organic Compounds for Aqueous Flow Batteries |
title_fullStr | Influence of Hydrotropes on the Solubilities and Diffusivities
of Redox-Active Organic Compounds for Aqueous Flow Batteries |
title_full_unstemmed | Influence of Hydrotropes on the Solubilities and Diffusivities
of Redox-Active Organic Compounds for Aqueous Flow Batteries |
title_short | Influence of Hydrotropes on the Solubilities and Diffusivities
of Redox-Active Organic Compounds for Aqueous Flow Batteries |
title_sort | influence of hydrotropes on the solubilities and diffusivities
of redox-active organic compounds for aqueous flow batteries |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8600646/ https://www.ncbi.nlm.nih.gov/pubmed/34805708 http://dx.doi.org/10.1021/acsomega.1c05133 |
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