Li Junjie, Wang Zhongchang, Chen Chunlin, Huang Sumei
1] Engineering Research Center for Nanophotonics and Advanced Instrument, Ministry of Education, Department of Physics, East China Normal University, North Zhongshan Road 3663, Shanghai 200062, China [2] Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan.
Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan.
Sci Rep. 2014 Jul 1;4:5521. doi: 10.1038/srep05521.
Unraveling structural dynamics of noble metal nanoclusters on oxide supports is critical to understanding reaction process and origin of catalytic activity in heterogeneous catalysts. Here, we show that aberration-corrected scanning transmission electron microscopy can provide direct atomic-resolution imaging of surface migration, coalescence, and atomic rearrangement of Au clusters on an Y:ZrO₂ (YSZ) support. The high resolution enables us to reveal migration and coalescence process of Au clusters at the atomic scale, and to demonstrate that the coalesced clusters undergo a cooperative atomic rearrangement, which transforms the coherent into incoherent Au/YSZ interface. This approach can help to elucidate atomistic mechanism of catalytic activities and to develop novel catalysts with enhanced functionality.
揭示贵金属纳米团簇在氧化物载体上的结构动力学对于理解多相催化剂中的反应过程和催化活性起源至关重要。在此，我们表明，像差校正扫描透射电子显微镜能够对Y:ZrO₂（YSZ）载体上Au团簇的表面迁移、聚结和原子重排提供直接的原子分辨率成像。高分辨率使我们能够在原子尺度上揭示Au团簇的迁移和聚结过程，并证明聚结后的团簇会经历协同原子重排，从而将相干的Au/YSZ界面转变为非相干界面。这种方法有助于阐明催化活性的原子机制，并开发具有增强功能的新型催化剂。
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