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Open AccessFeature PaperArticle

Thermodynamic Insights for Electrochemical Hydrogen Compression with Proton-Conducting Membranes

Mechanical Engineering, Colorado School of Mines, Golden, CO 80401, USA
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Membranes 2019, 9(7), 77; https://doi.org/10.3390/membranes9070077
Received: 5 June 2019 / Accepted: 20 June 2019 / Published: 1 July 2019
(This article belongs to the Special Issue Catalytic Membranes and Their Applications)
Membrane electrode assemblies (MEA) based on proton-conducting electrolyte membranes offer opportunities for the electrochemical compression of hydrogen. Mechanical hydrogen compression, which is more-mature technology, can suffer from low reliability, noise, and maintenance costs. Proton-conducting electrolyte membranes may be polymers (e.g., Nafion) or protonic-ceramics (e.g., yttrium-doped barium zirconates). Using a thermodynamics-based analysis, the paper explores technology implications for these two membrane types. The operating temperature has a dominant influence on the technology, with polymers needing low-temperature and protonic-ceramics needing elevated temperatures. Polymer membranes usually require pure hydrogen feed streams, but can compress H 2 efficiently. Reactors based on protonic-ceramics can effectively integrate steam reforming, hydrogen separation, and electrochemical compression. However, because of the high temperature (e.g., 600 ° C) needed to enable viable proton conductivity, the efficiency of protonic-ceramic compression is significantly lower than that of polymer-membrane compression. The thermodynamics analysis suggests significant benefits associated with systems that combine protonic-ceramic reactors to reform fuels and deliver lightly compressed H 2 (e.g., 5 bar) to an electrochemical compressor using a polymer electrolyte to compress to very high pressure. View Full-Text
Keywords: electrochemical compression; proton-conducting membranes; protonic-ceramics; steam reforming electrochemical compression; proton-conducting membranes; protonic-ceramics; steam reforming
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Kee, B.L.; Curran, D.; Zhu, H.; Braun, R.J.; DeCaluwe, S.C.; Kee, R.J.; Ricote, S. Thermodynamic Insights for Electrochemical Hydrogen Compression with Proton-Conducting Membranes. Membranes 2019, 9, 77.

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