Abstract
Developing advanced hydrogen storage materials with high capacity and efficient reversibility is a crucial aspect for utilizing hydrogen source as a promising alternate to fossil fuels. In this paper, we have systematically investigated the hydrogen storage properties of neutral and negatively charged C9N4 monolayer based on density functional theory (DFT). Our foundings indicate that injecting additional electrons into the adsorbent significantly boosts the adsorption capacity of C9N4 monolayer to H2 molecules. The gravimetric density of negatively charged C9N4 monolayer can reach up to 10.80 wt% when fully covered with hydrogen. Unlike other hydrogen storage methods, the storage and release processes happen automatically upon introducing or removing extra electrons. Moreover, these operations can be easily adjusted through activating or deactivating the charging voltage. As a result, the method is easily reversible and has tunable kinetics without requiring particular activators. Significantly, C9N4 is proved to be a suitable candidate for efficient electron injection/release due to its well electrical conductivity. Our work can serve as a valuable guide in the quest for a novel category of materials for hydrogen storage with high capacity.
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Acknowledgements
We thank Jing Xue, Wanyi Zhao and Kaiyue Liu for their contributions to the image and text editions. The work was founded by Henan Scientific Research Fund for Returned Scholars, the Young Scientist Project of Henan Province (Grant Eo. 225200810103), the Program for Science & Technology Innovation Talents in Universities of Henan Province (Grant Eo. 24HASTIT013), Henan College Key Research Project (Grant Eo. 24A430002), the Eatural Science Foundation of Henan Province (Grant Eo. 232300420128), the Scientific Research Innovation Team Project of Anyang Eormal University (Grant Eo. 2023AYSYKYCXTD04), and the College Students Innovation Fund of Anyang Normal University (Grant Eo. 202310479077).
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Ju, L., Liu, J., Wang, M. et al. Modulation of charge in C9N4 monolayer for a high-capacity hydrogen storage as a switchable strategy. Front. Phys. 19, 43208 (2024). https://doi.org/10.1007/s11467-023-1385-0
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DOI: https://doi.org/10.1007/s11467-023-1385-0