Raisins in a Hydrogen Pie: Ultrastable Cesium and Rubidium Polyhydrides
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| Autores principales: | , , , , , , , , |
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| Formato: | Preprint |
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2024
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| _version_ | 1866913319552548864 |
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| author | Zhou, Di Semenok, Dmitrii V. Galasso, Michele Alabarse, Frederico Gil Sannikov, Denis A. Troyan, Ivan A. Nakamoto, Yuki Shimizu, Katsuya Oganov, Artem R. |
| author_facet | Zhou, Di Semenok, Dmitrii V. Galasso, Michele Alabarse, Frederico Gil Sannikov, Denis A. Troyan, Ivan A. Nakamoto, Yuki Shimizu, Katsuya Oganov, Artem R. |
| contents | We proposed a new method for synthesis of metal polyhydrides via high-pressure thermal decomposition of corresponding amidoboranes in diamond anvil cells. Within this approach, we synthesized molecular semiconducting cesium ($\textit P4/nmm$-CsH$_7$, $\textit P$1-CsH$_{15+x}$) and rubidium (RbH$_{9-x}$) polyhydrides with a very high hydrogen content reaching 93 at%. Preservation of CsH$_7$ at near ambient conditions, confirmed both experimentally and theoretically, represents a significant advance in the stabilization of hydrogen-rich compounds. In addition, we synthesized two crystal modifications of RbH$_{9-x}$ with pseudo hexagonal and pseudo tetragonal structures identified by synchrotron X-ray diffraction and Raman measurements. Both phases are stable at 8-10 GPa. This is an unprecedented low stabilization pressure for polyhydrides. These discoveries open up possibilities for modifying existing hydrogen storage materials to increase their efficiency. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_00742 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Raisins in a Hydrogen Pie: Ultrastable Cesium and Rubidium Polyhydrides Zhou, Di Semenok, Dmitrii V. Galasso, Michele Alabarse, Frederico Gil Sannikov, Denis A. Troyan, Ivan A. Nakamoto, Yuki Shimizu, Katsuya Oganov, Artem R. Materials Science Soft Condensed Matter We proposed a new method for synthesis of metal polyhydrides via high-pressure thermal decomposition of corresponding amidoboranes in diamond anvil cells. Within this approach, we synthesized molecular semiconducting cesium ($\textit P4/nmm$-CsH$_7$, $\textit P$1-CsH$_{15+x}$) and rubidium (RbH$_{9-x}$) polyhydrides with a very high hydrogen content reaching 93 at%. Preservation of CsH$_7$ at near ambient conditions, confirmed both experimentally and theoretically, represents a significant advance in the stabilization of hydrogen-rich compounds. In addition, we synthesized two crystal modifications of RbH$_{9-x}$ with pseudo hexagonal and pseudo tetragonal structures identified by synchrotron X-ray diffraction and Raman measurements. Both phases are stable at 8-10 GPa. This is an unprecedented low stabilization pressure for polyhydrides. These discoveries open up possibilities for modifying existing hydrogen storage materials to increase their efficiency. |
| title | Raisins in a Hydrogen Pie: Ultrastable Cesium and Rubidium Polyhydrides |
| topic | Materials Science Soft Condensed Matter |
| url | https://arxiv.org/abs/2401.00742 |