Interlayer hydrogen-hydrogen spacing regulates the formation of molecular hydrogen in hydrogen boride nanosheets
Rattachement africain : jp. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
Hydrogen carriers that enable efficient transport and on-demand release of molecular hydrogen (H2) are crucial for practical hydrogen-based energy systems. Hydrogen boride (HB) nanosheets, composed of boron and hydrogen in a 1:1 stoichiometric ratio, have promising potential as safe and lightweight hydrogen carriers owing to their high gravimetric hydrogen density (8.5 wt %). In particular, heating of HB nanosheets results in H2 release over a broad temperature range from 423 to 1473 K. However, the mechanism of the multimodal H₂ desorption remains unclear. In this work, we elucidate that the interlayer H···H distances (dH···H) determine the multimodal desorption of H2 especially in the lower-temperature range (< 623 K). HB nanosheets subjected to various temperatures under different H2 pressures were prepared to investigate the thermal stability of their bonding configurations. Infrared spectroscopy and temperature-programmed desorption measurements revealed the occurrence of hydrogen depletion while the bonding configuration remains unchanged. The first to third nearest dH···H, along with the numbers of the corresponding H···H pairs, were systematically calculated for four possible interlayer stacking types. The calculated H···H pairs distribution closely matched the experimental profile for the thermally induced H2 desorption, suggesting that the multimodal desorption of H2 in the lower-temperature range is governed by the distribution of hydrogen distances. This study elucidates the unique mechanisms of H2 formation in HB nanosheets and provides valuable insights into the design of two-dimensional hydrogen containing materials.
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University of Tsukuba Department of Materials Science pays non établi dans la noticeUniversité ou école supérieure
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Tsukuba University of Technology pays non établi dans la noticeUniversité ou école supérieure
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Hiroshima University pays non établi dans la noticeUniversité ou école supérieure
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National Institutes for Quantum Science and Technology pays non établi dans la noticeStructure de recherche
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National Institute for Materials Science pays non établi dans la noticeStructure de recherche
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The University of Osaka pays non établi dans la noticeUniversité ou école supérieure
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Tohoku University Institute for Materials Research pays non établi dans la noticeUniversité ou école supérieure
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Graduate School of Science and Technology pays non établi dans la noticeUniversité ou école supérieure
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Graduate School of Advanced Science and Engineering pays non établi dans la noticeUniversité ou école supérieure
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Graduate School of Engineering Department of Precision Engineering pays non établi dans la noticeUniversité ou école supérieure
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Research Center for Energy and Environmental Materials pays non établi dans la noticeStructure de recherche
Department of Materials Science — University of Tsukuba, Tsukuba University of Technology et Hiroshima University, avec 9 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.