This title appears in the Scientific Report :
2016
Please use the identifier:
http://dx.doi.org/10.1149/2.0271611jes in citations.
Please use the identifier: http://hdl.handle.net/2128/13413 in citations.
Acidic or Alkaline? Towards a New Perspective on the Efficiency of Water Electrolysis
Acidic or Alkaline? Towards a New Perspective on the Efficiency of Water Electrolysis
Water electrolysis is a promising technology for enabling the storage of surplus electricity produced by intermittent renewable power sources in the form of hydrogen. At the core of this technology is the electrolyte, and whether this is acidic or alkaline affects the reaction mechanisms, gas puriti...
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Personal Name(s): | Schalenbach, Maximilian (Corresponding author) |
---|---|
Tjarks, Geert / Carmo, Marcelo / Lüke, Wiebke / Müller, Martin / Stolten, Detlef | |
Contributing Institute: |
Technoökonomische Systemanalyse; IEK-3 |
Published in: | Journal of the Electrochemical Society, 163 (2016) 11, S. F3197 - F3208 |
Imprint: |
Cambridge
RSC Publ.
2016
|
DOI: |
10.1149/2.0271611jes |
Document Type: |
Journal Article |
Research Program: |
Electrolysis and Hydrogen |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/13413 in citations.
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520 | |a Water electrolysis is a promising technology for enabling the storage of surplus electricity produced by intermittent renewable power sources in the form of hydrogen. At the core of this technology is the electrolyte, and whether this is acidic or alkaline affects the reaction mechanisms, gas purities and is of significant importance for the stability and activity of the electrocatalysts. This article presents a simple but precise physical model to describe the voltage-current characteristic, heat balance, gas crossover and cell efficiency of water electrolyzers. State-of-the-art water electrolysis cells with acidic and alkaline electrolyte are experimentally characterized in order to parameterize the model. A rigorous comparison shows that alkaline water electrolyzers with Ni-based catalysts but thinner separators than those typically used is expected be more efficient than acidic water electrolysis with Ir and Pt based catalysts. This performance difference was attributed mainly to a similar conductivity but approximately 38-fold higher diffusivities of hydrogen and oxygen in the acidic polymer electrolyte membrane (Nafion) than those in the alkaline separator (Zirfon filled with a 30 wt} KOH solution). With reference to the detailed analysis of the cell characteristics, perspectives for the improvement of the efficiency of water electrolyzers are discussed. | ||
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