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Study of Deuterium Isotope Separation by PEFC

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Title: Study of Deuterium Isotope Separation by PEFC
Authors: Shibuya, Shota Browse this author
Matsushima, Hisayoshi Browse this author →KAKEN DB
Ueda, Mikito Browse this author →KAKEN DB
Keywords: Hydrogen Electrode-reaction
Evolution reaction
Intermetallic phases
Issue Date: 20-Jul-2016
Publisher: The Electrochemical Society (ECS)
Journal Title: Journal of the electrochemical society
Volume: 163
Issue: 7
Start Page: F704
End Page: F707
Publisher DOI: 10.1149/2.1321607jes
Abstract: Hydrogen evolution and oxidation reactions were studied on a polycrystalline platinum electrode in 0.05 M D2SO4 solution at 298 K by using a rotating disk electrode, focusing on the kinetic isotope effect on reactivity. The polarization measurements in the evolution reaction regime, on the one hand, revealed two Tafel regions: at low overpotentials close to the equilibrium potential, the Tafel slope was 0.039 V dec(-1), suggesting a Volmer-Tafel mechanism; and at potentials around 0.05 V or lower, a slope of 0.168 V dec(-1) indicated that a transition to a Heyrovsky-Tafel mechanism occurred. In the oxidation reaction regime, on the other hand, a single Tafel slope of 0.055 V dec(-1) was observed at potentials of 0.08 V or lower. Comparing between the deuterium and protium data for the kinetic factors supported the presence of an isotope effect, whereby the deuterium was more easily dissociated on the platinum electrode. The present kinetic result supported the deuterium separation of polymer electrolyte fuel cell (PEFC) in which the mixture gases of H-2 and D-2 were purged. The deuterium separation factor increased with increasing in the hydrogen utilization. This suggests a new isotope separation technique and also provides useful data for fuel cells. (C) 2016 The Electrochemical Society. All rights reserved.
Rights: © The Electrochemical Society, Inc. 2016. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS). The archival version of this work was published in Journal of the electrochemical society, volume 163, Issue 7, pp. F704-F707, 2016.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 松島 永佳

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