Effect of alkaline fuel cell catalyst on deuterium isotope separation

Tanii, R. and Ogawa, R. and Matsushima, H. and Ueda, M. and Dawson, R. (2021) Effect of alkaline fuel cell catalyst on deuterium isotope separation. International Journal of Hydrogen Energy, 46 (9). pp. 6745-6750. ISSN 0360-3199

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Fuel cells (FC) have been developed for automobiles and stationary power units. In addition to a power generator function, we propose a new application of hydrogen isotope separation. In this paper, deuterium (D) separation is investigated by two types of AFCs with platinum (Pt) or ruthenium (Ru) anode catalysts. The characteristics of the AFCs are evaluated by pure protium (H) or deuterium gas separately. In the case of Pt catalyst, the cell current/voltage curves show similar results for both gases. But a remarkable decrease in the voltage value is observed probably due to the mass transportation (diffusion) limitation at Ru catalyst. The limitation effect was larger for D2 than H2 gas. The AC impedance measurements supports the slow reaction rate of D2 gas on Ru catalyst. The separation experiments are verified with hydrogen gas mixed with 1 at% D. The D is diluted in the unreacted gas discharged from AFC with Pt catalyst, but it is concentrated with Ru one. The inverse response may be attributed to the elementary process of the hydrogen oxidation reaction and the difference in the adsorption energy of gas and water molecules on the catalyst surface. © 2020 Hydrogen Energy Publications LLC

Item Type:
Journal Article
Journal or Publication Title:
International Journal of Hydrogen Energy
Additional Information:
This is the author’s version of a work that was accepted for publication in International Journal of Hydrogen Energy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Journal of Hydrogen Energy, 46, 2, 6745-6750, 2021 DOI: 10.1016/j.ijhydene.2020.11.140
Uncontrolled Keywords:
?? deuteriumfuel cellhydrogen isotopesrutheniumseparation factorcatalyst supportsgasesmass transportationmoleculesplatinumseparationac impedance measurementadsorption energiescatalyst surfaceselementary processgenerator functionhydrogen isotope separationhyd ??
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12 Jan 2021 14:14
Last Modified:
13 Jun 2024 01:46