Efficient Hydrogen Isotope Separation by Tunneling Effect Using Graphene-Based Heterogeneous Electrocatalysts in Electrochemical Hydrogen Isotope PumpingClick to copy article linkArticle link copied!
- Satoshi Yasuda*Satoshi Yasuda*Email: [email protected]Research Group for Surface and Interface Science, Advanced Science Research Center, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai, Ibaraki 319-1195, JapanMore by Satoshi Yasuda
- Hisayoshi MatsushimaHisayoshi MatsushimaFaculty of Engineering, Hokkaido University, North 13, West 8, Kita-ku, Sapporo, Hokkaido 060-8628, JapanMore by Hisayoshi Matsushima
- Kenji HaradaKenji HaradaFaculty of Engineering, Hokkaido University, North 13, West 8, Kita-ku, Sapporo, Hokkaido 060-8628, JapanMore by Kenji Harada
- Risako TaniiRisako TaniiFaculty of Engineering, Hokkaido University, North 13, West 8, Kita-ku, Sapporo, Hokkaido 060-8628, JapanMore by Risako Tanii
- Tomo-o TerasawaTomo-o TerasawaInstitute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, JapanResearch Group for Surface and Interface Science, Advanced Science Research Center, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai, Ibaraki 319-1195, JapanMore by Tomo-o Terasawa
- Masahiro YanoMasahiro YanoResearch Group for Surface and Interface Science, Advanced Science Research Center, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai, Ibaraki 319-1195, JapanMore by Masahiro Yano
- Hidehito AsaokaHidehito AsaokaResearch Group for Surface and Interface Science, Advanced Science Research Center, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai, Ibaraki 319-1195, JapanMore by Hidehito Asaoka
- Jessiel Siaron GueribaJessiel Siaron GueribaDepartment of Applied Physics, Osaka University, Suita, Osaka 565-0871, JapanMore by Jessiel Siaron Gueriba
- Wilson Agerico DiñoWilson Agerico DiñoDepartment of Applied Physics, Osaka University, Suita, Osaka 565-0871, JapanCenter for Atomic and Molecular Technologies, Osaka University, Suita, Osaka 565-0871, JapanMore by Wilson Agerico Diño
- Katsuyuki FukutaniKatsuyuki FukutaniInstitute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, JapanResearch Group for Surface and Interface Science, Advanced Science Research Center, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai, Ibaraki 319-1195, JapanMore by Katsuyuki Fukutani
Abstract

The fabrication of a hydrogen isotope enrichment system is essential for the development of industrial, medical, life science, and nuclear fusion fields, and therefore, efficient enrichment techniques with a high separation factor and economic feasibility are still being explored. Herein, we report a hydrogen/deuterium (H/D) separation ability with polymer electrolyte membrane electrochemical hydrogen pumping (PEM-ECHP) using a heterogeneous electrode consisting of palladium and graphene layers (PdGr). By mass spectroscopic analysis, we demonstrate significant bias voltage dependence of the H/D separation factor with a maximum of ∼25 at 0.15 V and room temperature, which is superior to those of conventional separation methods. Theoretical analysis demonstrated that the observed high H/D factor stems from tunneling of hydrogen isotopes through atomically thick graphene during the electrochemical reaction and that the bias dependence of H/D results from a transition from the quantum tunneling regime to the classical overbarrier regime for hydrogen isotopes transfer through the graphene. These findings will help us understand the origin of the isotope separation ability of graphene discussed so far and contribute to developing an economical hydrogen isotope enrichment system using two-dimensional materials.
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