Hydrogen isotope separation with an alkaline membrane fuel cell

Ogawa, Ryota; Matsushima, Hisayoshi; Ueda, Mikito

doi:10.1016/j.elecom.2016.06.013

Cited by 16 publications

(5 citation statements)

References 18 publications

(21 reference statements)

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“…The kinetic isotope effects of H and D at noble metal/alkaline (H 2 O, D 2 O) solution interfaces have been interested in electrochemistry, physical chemistry, and material science. [1][2][3][4][5][6][7][8][9][10] The fundamental kinetic isotope effects of H and D at the interfaces are H replaced by D. The percentage of mass change between H and D is much greater than that between C isotopes, N isotopes, O isotopes, etc. 11 Under-and over-potentially deposited hydrogen (UPD H, OPD H) occupy different adsorption sites and act as two distinguishable electroadsorbed H species, and that only OPD H can contribute to the hydrogen evolution reaction (HER).…”

mentioning

confidence: 99%

Isotopic Shifts of the Frumkin and Temkin Adsorption Isotherms of H and D at Pt/Alkaline Solution Interfaces: Analysis Using the Phase-Shift Method

Chun

2019

J. Electrochem. Soc.

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Due to the superposition of various effects at electrocatalyst/solution interfaces, the Frumkin and Temkin adsorption isotherms of H and D are not readily determined using conventional methods. The phase-shift method is a unique electrochemical impedance spectroscopy technique for studying the linear relationship between the phase shift (90°≥ −ϕ ≥ 0°) for the optimum intermediate frequency vs potential (E) behavior and the fractional coverage (0 ≤ θ ≤ 1) for adsorption vs potential (E) behavior. The Frumkin and Temkin adsorption isotherms (θ vs E) of H and D and their isotopic shifts at Pt/0.1 M LiOH (H 2 O, D 2 O) solution interfaces are determined using the phase-shift method. Over the θ range (i.e., 1 ≥ θ ≥ 0), the kinetic isotope effect (K H/D ) is 3.1 to 3.5 and the standard Gibbs energy ( G θ 0 ) of D is 2.8 to 3.1 kJ mol −1 greater than that of H. The bond dissociation energy for Pt−D 2 O is greater than that for Pt−H 2 O. The rate-determining steps are determined by the recombination step at low θ or E and electrochemical desorption step at high θ or E, sequentially. The isotopic shifts of the Frumkin and Temkin adsorption isotherms of H and D and related electrode kinetic effects are clearly distinguished.

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mentioning

confidence: 99%

Isotopic Shifts of the Frumkin and Temkin Adsorption Isotherms of H and D at Pt/Alkaline Solution Interfaces: Analysis Using the Phase-Shift Method

Chun

2019

J. Electrochem. Soc.

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“…In [35,36] diffusion membranes are considered. In [37,38] authors investigate membranes for industrial applications. Bimaterial is considered in [39].…”

Section: Introductionmentioning

confidence: 99%

Low-temperature separation of helium-helion mixture

Бубенчиков

Bubenchikov

JAMBAA

et al. 2020

Reviews on Advanced Materials Science

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The research is devoted to the problem of designing materials with an adjustable property of permeability. The obtained tool for property regulation allows achieving hyper-selectivity in relation to separation of helium isotope mixtures, as well as some other gas mixtures. The reasearch is theoretical in nature; however, it suggests a clear direction of activity for experimenters. The result obtained is valid for ultrathin barriers of any form. As a result, a new exact solution of the Schrödinger equation of wave dynamics, which is valid for the case of two-barrier systems, is found. This solution allows for comprehensive consideration of the process of wave passage through a barrier and identification of the causes leading to super-permeability of individual components.

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“…To consider the full advantages of a CEFC system, it is necessary to investigate not only energy consumption but also the synergetic effects of additional separation in the fuel cell. It has been reported that the kinetic isotope effect of the hydrogen oxidation reaction is also been observed in PEFCs [28][29][30][31]. Hence, CEFCs have the potential to separate hydrogen isotopes more efficiently and cheaply than…”

Section: Introductionmentioning

confidence: 99%

Deuterium isotope separation by combined electrolysis fuel cell

Ogawa

Tanii

Dawson

et al. 2018

Energy

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The framework about combined electrolysis fuel cell (CEFC) was reported previously [H. Matsushima et al., Energy, 2005; 30; 2413]. The purpose of the present study focused on measuring the separation factor and the energy reduction by assembling CEFC system. The separation of deuterium was studied with a 1-M KOH electrolyte containing 10 at% deuterium. Polarization plots of alkaline water electrolysis (AWE) revealed relationships between the catalytic activity of the hydrogen evolution reaction and the deuterium separation factor. The power loss was mainly attributed to gas bubble evolution. For polymer electrolyte fuel cells (PEFCs) with a Pt catalyst, approximately 21% of the electrical energy could be recovered by reusing hydrogen gas produced by the AWE. Furthermore, the PEFC could efficiently dilute protium in the gas phase, resulting in a high separation factor of 30.2 for the CEFC.

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Hydrogen isotope separation with an alkaline membrane fuel cell

Cited by 16 publications

References 18 publications

Isotopic Shifts of the Frumkin and Temkin Adsorption Isotherms of H and D at Pt/Alkaline Solution Interfaces: Analysis Using the Phase-Shift Method

Isotopic Shifts of the Frumkin and Temkin Adsorption Isotherms of H and D at Pt/Alkaline Solution Interfaces: Analysis Using the Phase-Shift Method

Low-temperature separation of helium-helion mixture

Deuterium isotope separation by combined electrolysis fuel cell

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