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Synthesis of NiO Crystals Exposing Stable High-Index Facets.
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-04-17 , DOI: 10.1002/anie.202003390
Mariano D Susman 1 , Hien N Pham 2 , Xiaohui Zhao 1 , David H West 3 , Sivadinarayana Chinta 3 , Praveen Bollini 1 , Abhaya K Datye 2 , Jeffrey D Rimer 1
Affiliation  

Metal oxides exposing high‐index facets are potentially impactful in catalysis and adsorption processes owing to under‐coordinated ions and polarities that alter their interfacial properties compared to low‐index facets. Here, we report molten‐salt syntheses of NiO particles exposing a variety of crystal facets. We show that for a given anion (nitrate or chloride), the alkali cation has a notable impact on the formation of crystals exposing {311}, {611}, {100}, and {111} faces. Based on a parametric analysis of synthesis conditions, we postulate that the crystallization mechanism is governed by the formation of growth units consisting of NiII complexes whose coordination numbers are determined by temperature and the selection of anion (associated to the coordination sphere) and alkali cation (associated with the outer coordination sphere). Notably, our findings reveal that high‐index facets are particularly favored in chloride media and are stable under prolonged periods of catalysis and steaming.

中文翻译:

暴露稳定高折射率面的NiO晶体的合成。

暴露于高折射率小面的金属氧化物可能会在催化和吸附过程中产生影响,这是由于与低折射率小面相比,配位不足的离子和极性会改变其界面性质。在这里,我们报道了NiO颗粒的熔融盐合成方法,该方法暴露了各种晶面。我们表明,对于给定的阴离子(硝酸根或氯离子),碱金属阳离子对暴露于{311},{611},{100}和{111}面的晶体形成有显着影响。根据合成条件的参数分析,我们假设结晶机理是由Ni II组成的生长单元的形成控制的配合物的配位数取决于温度以及阴离子(与配位球相关)和碱金属阳离子(与外配位球相关)的选择。值得注意的是,我们的发现表明,高折射率刻面在氯化物介质中特别受青睐,并且在长时间的催化作用和蒸汽作用下保持稳定。
更新日期:2020-04-17
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