This title appears in the Scientific Report :
2023
Please use the identifier:
http://dx.doi.org/10.34734/FZJ-2023-03917 in citations.
Please use the identifier: http://dx.doi.org/10.1021/acs.jced.3c00040 in citations.
Critical Analysis of Published Physical Property Data for Aqueous Potassium Hydroxide. Collation into Detailed Models for Alkaline Electrolysis
Critical Analysis of Published Physical Property Data for Aqueous Potassium Hydroxide. Collation into Detailed Models for Alkaline Electrolysis
Physical properties of aqueous KOH solutions are crucial to the design and operation of alkaline electrolyzers but have been scarcely and sometimes unreliably reported. Obtaining published data for various properties currently requires time-consuming searches and subsequent interpretation, interpola...
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Personal Name(s): | Hodges, Aaron |
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Renz, Stefanie / Lohmann-Richters, Felix / Al-Musawi, Atheer / Jupke, Andreas (Corresponding author) / Lehnert, Werner (Corresponding author) / Swiegers, Gerhard F. (Corresponding author) / Wallace, Gordon G. | |
Contributing Institute: |
Elektrochemische Verfahrenstechnik; IEK-14 |
Published in: | Journal of chemical & engineering data, 68 (2023) 7, S. 1485 - 1506 |
Imprint: |
Columbus, Ohio
American Chemical Society
2023
|
DOI: |
10.34734/FZJ-2023-03917 |
DOI: |
10.1021/acs.jced.3c00040 |
Document Type: |
Journal Article |
Research Program: |
Electrochemistry for Hydrogen |
Link: |
Get full text Published on 2023-06-23. Available in OpenAccess from 2024-06-23. Published on 2023-06-23. Available in OpenAccess from 2024-06-23. |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1021/acs.jced.3c00040 in citations.
Physical properties of aqueous KOH solutions are crucial to the design and operation of alkaline electrolyzers but have been scarcely and sometimes unreliably reported. Obtaining published data for various properties currently requires time-consuming searches and subsequent interpretation, interpolation, and extrapolation. This work collates and critically analyzes published data for a range of physical properties relevant to alkaline electrolysis, including the density, viscosity, conductivity, surface tension, oxygen/hydrogen solubility, oxygen/hydrogen diffusivity, and water vapor pressures of aqueous KOH solutions, as a function of temperature, KOH molarity, and pressure. Correlation functions, in the form of excel spreadsheets, have been developed to allow interpolation of the most reliable data and computation of desired quantities at specific temperatures, pressures, and KOH concentrations. Composite models incorporating these properties have been developed for automated computation of (i) diffusive gas crossover and (ii) gas production volumes, including (iii) water vapor content, and associated (iv) dissolved gas concentrations in the liquid electrolyte, as a function of KOH concentration, temperature, pressure, current density, and separator thickness and porosity. These spreadsheets are provided in the Supporting Information, as tools and reference points for researchers and practitioners in alkaline electrolysis. |