Rights statement: 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
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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Effect of alkaline fuel cell catalyst on deuterium isotope separation
AU - Tanii, R.
AU - Ogawa, R.
AU - Matsushima, H.
AU - Ueda, M.
AU - Dawson, R.
N1 - 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
PY - 2021/2/3
Y1 - 2021/2/3
N2 - 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
AB - 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
KW - Deuterium
KW - Fuel cell
KW - Hydrogen isotopes
KW - Ruthenium
KW - Separation factor
KW - Catalyst supports
KW - Gases
KW - Mass transportation
KW - Molecules
KW - Platinum
KW - Separation
KW - AC impedance measurement
KW - Adsorption energies
KW - Catalyst surfaces
KW - Elementary process
KW - Generator function
KW - Hydrogen isotope separation
KW - Hydrogen oxidation reaction
KW - Isotope separation
KW - Alkaline fuel cells
U2 - 10.1016/j.ijhydene.2020.11.140
DO - 10.1016/j.ijhydene.2020.11.140
M3 - Journal article
VL - 46
SP - 6745
EP - 6750
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
SN - 0360-3199
IS - 9
ER -