论文信息 - High temperature type protonic conductor based on SrCeO3 and its application to the extraction of hydrogen gas

High temperature type protonic conductor based on SrCeO3 and its application to the extraction of hydrogen gas

Protonic and electronic conductivities of SrCe0.95Yb0.05O3−α ceramic in hydrogen gas were investigated at high temperatures. The protonic conductivity was 2 orders of magnitude higher than electronic conductivity. When the ceramic was exposed to hydrogen gas on one sinde and to oxygen gas on another side (fuel cell condition), the electronic conductivity increases with increasing partial pressure of oxygen suggesting that the charge carriers were positive holes. Using this ceramic as a solid electrolyte diaphragm, electrochemical hydrogen extractor was constructed by way of experiment and we could extract hydrogen from the pyrolyzed gas of CO + H2O mixture, ethane or steam. A bench-scale steam electrolyzer was fabricated using the protonic conductor, and pure hydrogen gas could be extracted in a rate of a few l/hr.

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