Wang Guoqing, Chen Chen, Beshiwork Bayu Admasu, Xu Bo, Dong Yingchao, Lin Bin
School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China.
Department of Physics, Laboratory of Computational Materials Physics, Jiangxi Normal University, Nanchang 330022, China.
Water Res. 2022 Oct 15;225:119076. doi: 10.1016/j.watres.2022.119076. Epub 2022 Sep 8.
Ceramic membranes for energy conversion and storage devices are essential for becoming carbon neutral due to low cost and high stability, but limited by slow proton and water transport. Meanwhile magic-angle graphene with unconventional superconductivity ushers in a new era, properties research of which are in infant stage, urgently longing for specific applications. Herein, we investigate the ionic-conductivity and water-transport properties of ceramic membrane-based magic-angle graphene by choosing proton and water as a proof-of-concept for the first time, discover the twist-angle tuned proton conduction and water transport in ceramic membrane-based magic-angle graphene, demonstrate the faster proton and water transport in magic-angle graphene than that in graphene, and construct an efficient device of protonic ceramic membrane fuel cell based upon the new fast proton-conducting materials of magic-angle graphene. The proton conduction and water transport in magic-angle graphene can be easily tuned by the twist angle, explained by the corresponding potential energy surface. The smaller the twist angle is, and the faster the proton transport is. The protonic migration energy barrier in magic-angle graphene is lower by about 50% than that in graphene. Additionally, the water transport properties in magic-angle graphene can be improved by tuning twist angles. The electrode with magic-angle graphene can provide higher performance of protonic ceramic membrane fuel cells. The present work opens the specific application of ceramic membrane-based magic-angle graphene as new proton-conducting and water-transport materials in energy and environment.
用于能量转换和存储设备的陶瓷膜因其低成本和高稳定性对于实现碳中和至关重要，但受限于缓慢的质子和水传输。与此同时，具有非常规超导性的魔角石墨烯开启了一个新时代，其性质研究尚处于起步阶段，迫切需要特定的应用。在此，我们首次选择质子和水作为概念验证，研究基于陶瓷膜的魔角石墨烯的离子传导性和水传输性质，发现基于陶瓷膜的魔角石墨烯中扭转角调控的质子传导和水传输，证明魔角石墨烯中质子和水的传输比石墨烯中更快，并基于魔角石墨烯这种新型快速质子传导材料构建了高效的质子陶瓷膜燃料电池装置。魔角石墨烯中的质子传导和水传输可通过扭转角轻松调控，这由相应的势能面解释。扭转角越小，质子传输越快。魔角石墨烯中的质子迁移能垒比石墨烯中的低约50%。此外，通过调整扭转角可改善魔角石墨烯中的水传输性质。具有魔角石墨烯的电极可提供更高性能的质子陶瓷膜燃料电池。本工作开启了基于陶瓷膜的魔角石墨烯作为能量和环境领域新型质子传导和水传输材料的特定应用。
