An isotope effect in electrolytic hydrogen absorption of some transition metals studied by ERDA and SIMS techniques |
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| Institution: | 1. Department of Quantum Science & Energy Engineering, Graduate School of Engineering, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8579, Japan;2. The Wakasa Wan Energy Research Center, 64-52-1, Nagatani, Tsuruga 914-0192, Japan;3. Department of Crystalline Materials Science, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan;1. School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China;2. School of Life Science and Technology, Changchun University of Science and Technology, Changchun 130022, China;3. National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8569, Japan;1. Grup de Caracterització de Materials, Departament de Física, EEBE and Barcelona Research Center in Multiscale Science and Engineering, Campus Diagonal-Bèsos, Universitat Politècnica de Catalunya, Eduard Maristany, 10-14, 08019 Barcelona, Catalonia, Spain;2. Sanofi R&D, Pharmaceutics Development Platform/Analytical Sciences/Solid State Group, 13 quai Jules Guesde, F-94400 Vitry sur Seine, France;3. Normandie Université, Laboratoire SMS-EA3233, Université de Rouen, F76821, Mont Saint Aignan, France;4. Laboratoire de Chimie Physique, Faculté de Pharmacie, Université Paris Descartes, USPC, 4 Avenue de l’Observatoire, 75006 Paris, France;5. LETIAM, EA7357, IUT Orsay, Université Paris Sud, rue Noetzlin, 91405 Orsay, France;1. National Institute for Lasers, Plasma and Radiation Physics, 409 Atomistilor Str., PO Box MG-36, Magurele, Ilfov, Romania;2. “Politehnica” University of Bucharest, Faculty of Applied Chemistry and Materials Sciences, 1-7 Gh. Polizu Str., Bucharest, Romania;3. National R&D Institute for Isotopic and Molecular Technologies, Cluj-Napoca, Romania;4. University of Bucharest, Faculty of Physics, P. O. Box MG-11, Magurele, Ilfov 077125, Romania;1. Natural and Medical Sciences Research Center, University of Nizwa, P.O Box 33, Postal Code 616, Birkat Al Mauz, Nizwa, Oman;2. Department of Biochemistry, Abdul Wali Khan University Mardan, Mardan 23200, Pakistan;3. Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Halle, Germany |
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| Abstract: | The depth profiles of protium and deuterium which were charged electrolytically, were measured by elastic recoil detection analysis (ERDA) and secondary ion mass spectrometry (SIMS) techniques in order to study the isotope effect in hydrogen absorption of Ti, Zr, Nb, Ni and Pd. The absolute loading ratios of H(D)/metal were calculated from the ERDA spectra and the depth profiles of SIMS were compared with the results of the ERDA. The isotope absorption ratios are estimated to be (D/H)Ti=0.43, (D/H)Zr=0.53, (D/H)Nb=0.17 and (D/H)Pd=0.10. The content in Ni is below the detection limit. The mass balance equations based on the transport–absorption model, were applied to analysis of the experimental results. This model reveals that the isotope absorption ratios for the Nb and Pd cases are governed mainly by the flux of hydrogen ions flowing to the surface of the metal electrode. However, the competition between the absorption–conversion process and the recombination process mainly determine the isotope ratio for the Ti and Zr cases. |
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