Abstract The kinetics of hydrogen storage in magnesium can be accelerated by nanocarbon additives. In this study, we show that loading magnesium by graphene nanoplatelets (GNP) enhances the kinetics by more than an order of magnitude. The GNP presence reduces the Mg agglomeration, induced by de/hydriding, and accelerates the kinetics by connecting between Mg particles. The GNP were prepared by top-down graphite ball-milling in the presence of various organic protective agents. We found that both the molecular structure of the protective agent and the milling energy dictated the GNP properties, namely, size, thickness, defect density and specific surface area. We demonstrated how manipulation of the GNP size has a major effect on the hydrogen storage kinetics in magnesium-GNP composites.

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储氢动力学：石墨烯纳米片尺寸效应

摘要 纳米碳添加剂可以加速镁中储氢的动力学。在这项研究中，我们表明通过石墨烯纳米片 (GNP) 加载镁可将动力学提高一个数量级以上。GNP 的存在减少了由脱/氢化引起的 Mg 团聚，并通过连接 Mg 颗粒来加速动力学。在各种有机保护剂的存在下，通过自上而下的石墨球磨制备 GNP。我们发现保护剂的分子结构和研磨能量都决定了 GNP 特性，即尺寸、厚度、缺陷密度和比表面积。我们展示了 GNP 尺寸的操纵如何对镁-GNP 复合材料中的储氢动力学产生重大影响。