An acid-doped ice membrane for selective proton transport
| Autor: | Annemiek ter Heijne, Harm van der Kooij, Olaniyi Oladimeji, Michel Saakes, Iosif Kaniadakis, Tom H. J. A. Sleutels |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Proton Inorganic chemistry ice Energy Engineering and Power Technology Proton exchange membrane fuel cell Hydrochloric acid 02 engineering and technology 010402 general chemistry 01 natural sciences Redox Electrochemical cell Ion chemistry.chemical_compound Proton transport WIMEK Renewable Energy Sustainability and the Environment energy storage 021001 nanoscience & nanotechnology IEM 0104 chemical sciences Fuel Technology Membrane Nuclear Energy and Engineering chemistry 0210 nano-technology human activities Biological Recovery & Re-use Technology proton exchange membrane |
| Zdroj: | International Journal of Energy Research 45 (2021) 5 International Journal of Energy Research, 45(5), 8041-8048 International Journal of Energy Research |
| ISSN: | 0363-907X |
| Popis: | Cation exchange membranes need to have high permselectivity for protons to make these membranes suitable for, for example, energy storage devices. Here, we present the proof of concept for a proton selective membrane made of hydrochloric acid-doped ice. The proton selectivity of this acid-doped ice membrane is the result of defects in the ice structure, caused by the acid. Ice membranes were made from different hydrochloric acid concentrations (0.1-2.0 M). The proton permselectivity of all ice membranes was above 99.7% when both Na+ and K+ were present. The resistivity decreased exponentially with the concentration of acid in the ice membrane, reaching a value of 12 Ω.cm. The ice membranes were tested in an electrochemical cell using the Fe/Fe2+ and Fe2+/Fe3+ redox couples, and a power density of 7 W/m2 and OCV of 0.87 V were measured. The resistance of the ice membrane increased with time as protons moved from the ice structure, as determined from the higher pH of the ice after melting. These expelled protons (and corresponding counter charged ions) were not replaced by other mobile cations, indicating a permanent loss in conductivity, but not selectivity. To apply the ice membrane as a selective separator for protons in energy storage devices in the future, the membrane thickness should be reduced and the protons should be retained inside the ice. |
| Databáze: | OpenAIRE |
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