Metallo-N-Heterocycles - A new family of hydrogen storage material
| Autor: | Jintao Wang, Hui Wu, Zijun Jing, Wei Zhou, Yong Shen Chua, Anan Wu, Ruting Chen, Yang Yu, Qijun Pei, Teng He, Khai Chen Tan, Ping Chen |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Hydrogen Renewable Energy Sustainability and the Environment Inorganic chemistry Enthalpy Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Alkali metal 01 natural sciences 0104 chemical sciences Electronegativity Hydrogen storage chemistry Molecule General Materials Science Dehydrogenation Lithium 0210 nano-technology |
| Zdroj: | Energy Storage Materials. 26:198-202 |
| ISSN: | 2405-8297 |
| DOI: | 10.1016/j.ensm.2019.12.035 |
| Popis: | Storing hydrogen efficiently in condensed materials is a key technical challenge. Tremendous efforts have been given to inorganic hydrides containing B–H, Al–H and/or N–H bonds, while organic compounds with a great variety and rich chemistry in manipulating C–H and unsaturated bonds, however, are undervalued mainly because of their unfavourable thermodynamics and selectivity in dehydrogenation. Here, we developed a new family of hydrogen storage material spanning across the domain of inorganic and organic hydrogenous compounds, namely metallo-N-heterocycles, utilizing the electron donating nature of alkali or alkaline earth metals to tune the electron densities of N-heterocyclic molecules to be suitable for hydrogen storage in terms of thermodynamic properties. Theoretical calculations reveal that the enthalpies of dehydrogenation (ΔHd) of these metallo-N-heterocycles are dependent on the electronegativity of the metals. In line with our calculation results, sodium and lithium analogues of pyrrolides, imidazolides and carbazolides of distinct structures were synthesized and characterized for the first time, where the cation-π interaction was identified. More importantly, a reversible hydrogen absorption and desorption can be achieved over lithium carbazolide which has a hydrogen capacity as high as 6.5 wt% and a suitable enthalpy of dehydrogenation of 34.2 kJ mol−1-H2 for on-board hydrogen storage. |
| Databáze: | OpenAIRE |
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