Self-Printing on Graphitic Nanosheets with Metal Borohydride Nanodots for Hydrogen Storage.
Self-Printing on Graphitic Nanosheets with Metal Borohydride Nanodots for Hydrogen Storage.
复制标题
用金属硼氢化物纳米点在石墨纳米片上自印刷用于储氢
DOI：
10.1038/srep31144
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发表时间：
2016-08-03
影响因子：
4.6
通讯作者：
Zhang Q
中科院分区：
文献类型：
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作者：
Li Y;Ding X;Zhang Q
虽然硼氢化物纳米结构的合成已经为氢存储的进步奠定了充分的基础，但由于其高表面能、极强的还原性/亲水性和复杂的成分，获得具有优异分散性的超小（10 nm以下）金属硼氢化物纳米晶体是极具挑战性的。在这里，我们展示了一种机械力驱动的自打印工艺，使单分散（~6纳米）nabh4纳米点能够均匀地固定在新脱落的石墨纳米片（GNs）上。机械力和硼氢化物与石墨烯的相互作用都刺激nabh4簇嵌入/吸收到石墨层中，充当书写的“笔”，这是通过用“印刷”的硼氢化物剥离石墨烯来完成的。与微型NaBH4相比，这些nano-NaBH4@GNs具有良好的热力学（降低∆Hof ~45%），快速动力学（增加6倍以上）和稳定的脱氢/再氢化（NaBH4高达~5 wt%）。我们的研究结果有助于在二维支架上可扩展地制造零维复杂氢化物，具有增强的储氢能力，具有潜在的应用前景。
Although the synthesis of borohydride nanostructures is sufficiently established for advancement of hydrogen storage, obtaining ultrasmall (sub-10 nm) metal borohydride nanocrystals with excellent dispersibility is extremely challenging because of their high surface energy, exceedingly strong reducibility/hydrophilicity and complicated composition. Here, we demonstrate a mechanical-force-driven self-printing process that enables monodispersed (~6 nm) NaBH4nanodots to uniformly anchor onto freshly-exfoliated graphitic nanosheets (GNs). Both mechanical-forces and borohydride interaction with GNs stimulate NaBH4clusters intercalation/absorption into the graphite interlayers acting as a ‘pen’ for writing, which is accomplished by exfoliating GNs with the ‘printed’ borohydrides. These nano-NaBH4@GNs exhibit favorable thermodynamics (decrease in∆Hof ~45%), rapid kinetics (a greater than six-fold increase) and stable de-/re-hydrogenation that retains a high capacity (up to ~5 wt% for NaBH4) compared with those of micro-NaBH4. Our results are helpful in the scalable fabrication of zero-dimensional complex hydrides on two-dimensional supports with enhanced hydrogen storage for potential applications.