Hydrogen Extraction Using One-end Closed Tube Made of CaZrO_3-based Proton-conducting Ceramic for Tritium Recovery System

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In a nuclear fusion reactor, tritium and its compounds must be recovered for the purpose of fuel recycling and hydrogen gas must be separated from a gas mixture with hydrogen compounds and other molecules. Proton-conducting ceramics have the proper characteristics to aid in this separation. The present paper describes the performance of a hydrogen pump using the one-end closed tube made of a proton-conducting ceramic (CaZr0.9In0.1O3−α, Effective electrode area: 47 cm2) at 800°C. Hydrogen gas was selectively extracted from Ar–H2 mixed gas at the rate of Faraday’s low under an applied voltage of 3.5 V. This test apparatus could also electrolyze water vapor and/or decompose methane at the anode to generate hydrogen at the cathode. In the case of argon gas with 0.1% hydrogen, 0.1% methane and 1.2% water vapor, the hydrogen evolution rate was 0.34 ml/min at 3.5 V. The current density was 1.2 mA/cm2 and the current efficiency was 79%. Experimental data suggest that water vapor has an important role for the hydrogen extraction from the mixture with methane.
社団法人日本原子力学会の論文
2004-01-25