Compelling Rejuvenated Catalytic Performance in Metallic Glasses,Advanced Materials

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Compelling Rejuvenated Catalytic Performance in Metallic Glasses
Advanced Materials ( IF 27.4 ) Pub Date : 2018-09-13 , DOI: 10.1002/adma.201802764
Shun-Xing Liang ₁ , Zhe Jia ₂ , Yu-Jing Liu ₃ , Wenchang Zhang ₄ , Weimin Wang ₅ , Jian Lu ₂ , Lai-Chang Zhang ₁

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Metallic glasses (MGs) with the metastable nature and random atomic packing structure have attracted large attention in the catalytic family due to their superior catalytic performance. In contrast, their crystalline counterparts are restricted by the highly ordered packing structure, fewer surface active sites, and crystallographic defects for catalytic activity. The uncertainty of the different catalytic mechanisms and the intrinsic characteristics correlated to MGs and their crystalline counterparts become a major impediment to promote their catalytic efficiencies and widespread applications. Herein, it is reported that the excellent catalytic behavior in Fe‐based MGs goes through a detrimental effect with the partial crystallization, but receives a compelling rejuvenation in the full crystallization. Further investigation reveals that multiphase intermetallics with electric potential differences in fully crystallized alloys facilitate the formation of galvanic cells. More importantly, extensively reduced grain boundaries due to grain growth greatly weaken electron trapping and promote inner electron transportation. The relatively homogenous grain‐boundary corrosion in the intermetallics contributes to well‐separated phases after reaction, leading to refreshment of the surface active sites, thereby quickly activating hydrogen peroxide and rapidly degrading organic pollutants. The exploration of catalytic mechanisms in the crystalline counterparts of MGs provides significant insights into revolutionize novel catalysts.

中文翻译：

引人注目的金属玻璃再生催化性能

具有亚稳态性质和无规原子堆积结构的金属玻璃（MGs）由于其优异的催化性能而在催化族中引起了广泛的关注。相反，它们的结晶对应物受到高度有序的堆积结构，较少的表面活性位点和催化活性的晶体学缺陷的限制。不同的催化机理的不确定性以及与MGs及其晶体对应物相关的内在特性成为提高其催化效率和广泛应用的主要障碍。在此，据报道，在铁基MG中，优异的催化性能会经历部分结晶的有害作用，但在完全结晶中却具有令人信服的年轻化。进一步的研究表明，在完全结晶的合金中具有电势差的多相金属间化合物有助于形成原电池。更重要的是，由于晶粒长大而大大减少的晶界大大削弱了电子俘获并促进了内部电子的传输。金属间化合物中相对均匀的晶界腐蚀有助于反应后的相分离，导致表面活性部位的更新，从而快速活化过氧化氢并迅速降解有机污染物。在MG的晶体对应物中催化机理的探索为彻底革新新型催化剂提供了重要的见识。更重要的是，由于晶粒长大而大大减少的晶界大大削弱了电子俘获并促进了内部电子的传输。金属间化合物中相对均匀的晶界腐蚀有助于反应后的相分离，导致表面活性部位的更新，从而快速活化过氧化氢并迅速降解有机污染物。在MG的晶体对应物中催化机理的探索为彻底革新新型催化剂提供了重要的见识。更重要的是，由于晶粒长大而大大减少的晶界大大削弱了电子俘获并促进了内部电子的传输。金属间化合物中相对均匀的晶界腐蚀有助于反应后的相分离，导致表面活性部位的更新，从而快速活化过氧化氢并迅速降解有机污染物。在MG的晶体对应物中催化机理的探索为彻底革新新型催化剂提供了重要的见识。导致表面活性位点的更新，从而迅速激活过氧化氢并迅速降解有机污染物。在MG的晶体对应物中催化机理的探索为彻底革新新型催化剂提供了重要的见识。导致表面活性位点的更新，从而迅速激活过氧化氢并迅速降解有机污染物。在MG的晶体对应物中催化机理的探索为彻底革新新型催化剂提供了重要的见识。

更新日期：2018-09-13

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