Optimal operating parameters for advanced alkaline water electrolysis
| Autor: | Matheus T. de Groot, Joost Kraakman, Rodrigo Lira Garcia Barros |
|---|---|
| Přispěvatelé: | EIRES Eng. for Sustainable Energy Systems, EIRES Chem. for Sustainable Energy Systems, Sustainable Process Engineering, Chemical Reactor Engineering, Built Environment |
| Rok vydání: | 2022 |
| Předmět: |
Supersaturation
Gas crossover Fuel Technology Renewable Energy Sustainability and the Environment Diaphragm Cell potential Energy Engineering and Power Technology Alkaline electrolysis SDG 7 - Affordable and Clean Energy Condensed Matter Physics Nominal current density SDG 7 – Betaalbare en schone energie |
| Zdroj: | International Journal of Hydrogen Energy, 47(82), 34773-34783. Elsevier |
| ISSN: | 0360-3199 |
| Popis: | Advanced zero-gap alkaline electrolyzers can be operated at a significantly higher current density than traditional alkaline electrolyzers. We have investigated how their performance is influenced by diaphragm thickness, temperature and pressure. For this a semi-empirical current-voltage model has been developed based on experimental data of a 20 Nm3/h electrolyzer. The model was extrapolated to thinner diaphragm thicknesses and higher temperatures showing that a nominal current density of 1.8 A cm−2 is possible with a 0.1 mm diaphragm at 100 °C. However, these operating parameters also lead to increased gas crossover, which limits the ability to operate at low loads. A gas crossover model has been developed, which shows that crossover is mainly driven by diffusive transport of hydrogen, caused by a high local supersaturation at the diaphragm surface. To enable a low minimum load of 10% the operating pressure should be kept below 8 bara. |
| Databáze: | OpenAIRE |
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