Comparison of atomic scale dynamics for the middle and late transition metal nanocatalysts.
Comparison of atomic scale dynamics for the middle and late transition metal nanocatalysts.
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DOI：
10.1038/s41467-018-05831-z
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发表时间：
2018-08-23
影响因子：
16.6
通讯作者：
Khlobystov AN
中科院分区：
文献类型：
--
作者：
Cao K;Zoberbier T;Biskupek J;Botos A;McSweeney RL;Kurtoglu A;Stoppiello CT;Markevich AV;Besley E;Chamberlain TW;Kaiser U;Khlobystov AN
过渡金属纳米簇催化化学反应是提供可持续能源和材料的关键。然而，由于高度不稳定的金属纳米团簇在反应过程中改变其结构的不确定性，纳米催化剂的原子行为仍然在很大程度上是未知的。在这项研究中，我们揭示和探索的14个技术上重要的金属在碳纳米试管中使用时间序列成像原子分辨透射电子显微镜（TEM），采用电子束同时作为成像工具和刺激的反应纳米级簇的反应。纳米管中的缺陷形成和金属纳米团簇促进的新结构的生长使得不同金属能够按照它们与碳的键合和它们的催化活性的顺序进行排序，在元素周期表中显示出显着的变化。金属纳米团簇表现出复杂的动力学揭示原子工作的纳米催化剂，与镜像非均相催化的关键功能。纳米催化剂的原子行为在很大程度上仍然是未知的。在这里，作者通过原子分辨透射电子显微镜使用时间序列成像揭示和探索了碳纳米试管中14种技术上重要的金属的纳米级簇的反应。
Catalysis of chemical reactions by nanosized clusters of transition metals holds the key to the provision of sustainable energy and materials. However, the atomistic behaviour of nanocatalysts still remains largely unknown due to uncertainties associated with the highly labile metal nanoclusters changing their structure during the reaction. In this study, we reveal and explore reactions of nm-sized clusters of 14 technologically important metals in carbon nano test tubes using time-series imaging by atomically-resolved transmission electron microscopy (TEM), employing the electron beam simultaneously as an imaging tool and stimulus of the reactions. Defect formation in nanotubes and growth of new structures promoted by metal nanoclusters enable the ranking of the different metals both in order of their bonding with carbon and their catalytic activity, showing significant variation across the Periodic Table of Elements. Metal nanoclusters exhibit complex dynamics shedding light on atomistic workings of nanocatalysts, with key features mirroring heterogeneous catalysis. The atomistic behaviour of nanocatalysts still remains largely unknown. Here, the authors reveal and explore reactions of nm-sized clusters of 14 technologically important metals in carbon nano test tubes using time-series imaging by atomically-resolved transmission electron microscopy.
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作者：
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