In Situ Observation of Thermal Proton Transport through Graphene Layers
In Situ Observation of Thermal Proton Transport through Graphene Layers
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通过石墨烯层的热质子传输的原位观察
DOI：
10.1021/acsnano.7b03359
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发表时间：
2017
期刊：
影响因子：
17.1
通讯作者：
Tai Renzhong
中科院分区：
文献类型：
--
作者：
Zhu Daming;Liu Xing;Gao Yi;Li Yadong;Wang Rui;Xu Zijian;Ji Gengwu;Jiang Sheng;Zhao Bin;Yin Guangzhi;Li Li;Yang Tieying;Wang Yong;Yi Lin;Li Xiaolong;Tai Renzhong
质子可以穿透单层石墨烯，但较厚的石墨烯层(超过2层)具有更紧密的电子密度，被认为在室温和高温下不利于质子的穿透。在这项工作中，我们发展了一种亚时间分辨掠入射X射线衍射技术，完全实现了高温下热质子与石墨烯相互作用的实时观察。通过跟踪质子化过程中层间结构的变化，我们证明了热质子可以在900℃下通过镍箔上的多层石墨烯(超过8层)进行传输。相比之下，在相同的条件下，多层石墨烯对Ar、N、He及其衍生离子是不透气的。现场输运测量同时验证了高温下的穿透现象。此外，质子通过石墨烯的直接输运被认为是穿透现象的主要贡献。热活化、层间弱相互作用和镍催化剂的亲和力都可能有助于质子的输运。我们相信，这种方法可以成为在现场和实时表征与2D材料插层的离子的既定方法之一。
Protons can penetrate through single-layer graphene, but thicker graphene layers (more than 2 layers), which possess more compact electron density, are thought to be unfavorable for penetration by protons at room temperature and elevated temperatures. In this work, we developed anin situsubsecond time-resolved grazing-incidence X-ray diffraction technique, which fully realizes the real-time observation of the thermal proton interaction with the graphene layers at high temperature. By following the evolution of interlayer structure during the protonation process, we demonstrated that thermal protons can transport through multilayer graphene (more than 8 layers) on nickel foil at 900 °C. In comparison, under the same conditions, the multilayer graphenes are impermeable to argon, nitrogen, helium, and their derived ions. Complementaryin situtransport measurements simultaneously verify the penetration phenomenon at high temperature. Moreover, the direct transport of protons through graphene is regarded as the dominant contribution to the penetration phenomenon. The thermal activation, weak interlayer interaction between layers, and the affinity of the nickel catalyst may all contribute to the proton transport. We believe that this method could become one of the established approaches for the characterization of the ions intercalated with 2D materialsin situand in real-time.