Tracking the Facet Transformation of CeO2 by 17O Solid-State Nuclear Magnetic Resonance

IF 4.8 2区化学 Q2 CHEMISTRY, PHYSICAL

The Journal of Physical Chemistry Letters Pub Date : 2024-11-11 DOI:10.1021/acs.jpclett.4c02615

Yujie Wen, Wenjing Zhang, Juan Wen, Fang Wang, Xiaokang Ke, Junchao Chen, Luming Peng

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Abstract

CeO₂ nanomaterials expose various crystal facets with distinct surface geometry, resulting in different surface reactivities and material behaviors that ultimately determine their performances and suitability for a wide range of applications. Here, we apply ¹⁷O solid-state nuclear magnetic resonance (NMR) to follow the facet transformation of CeO₂ at increased temperatures, observing a transition from (100) to (110) and finally to the more stable (111), based on the characteristic NMR shifts associated with the unique surface structure of each facet. In addition, we explore the effects of Pt ions on the conversion of different facets, which are found to promote the formation of the thermally stable (111) facet. Furthermore, ¹⁷O solid-state NMR provides a semiquantitative method for measuring the fractions of exposed facets. This work offers new insights and a more comprehensive understanding of crystal facet structures, and the new approach can be readily extended to study the facets of other oxide-based materials.

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通过 17O 固态核磁共振追踪 CeO2 的面转变

CeO2 纳米材料的各种晶面具有不同的表面几何形状，从而产生不同的表面活性和材料行为，最终决定了它们的性能和是否适合广泛的应用。在这里，我们应用 17O 固态核磁共振 (NMR) 来跟踪 CeO2 在温度升高时的晶面转变，根据与每个晶面的独特表面结构相关的 NMR 移位特征，观察到从 (100) 到 (110) 的转变，最后到更稳定的 (111)。此外，我们还探讨了铂离子对不同刻面转换的影响，发现铂离子促进了热稳定 (111) 刻面的形成。此外，17O 固态核磁共振提供了一种半定量的方法来测量暴露面的比例。这项工作提供了对晶体刻面结构的新见解和更全面的理解，而且这种新方法可以很容易地扩展到对其他氧化物基材料刻面的研究。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

The Journal of Physical Chemistry Letters CHEMISTRY, PHYSICAL-NANOSCIENCE & NANOTECHNOLOGY

CiteScore

9.60

自引率

7.00%

发文量

1519

审稿时长

1.6 months

期刊介绍： The Journal of Physical Chemistry (JPC) Letters is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, chemical physicists, physicists, material scientists, and engineers. An important criterion for acceptance is that the paper reports a significant scientific advance and/or physical insight such that rapid publication is essential. Two issues of JPC Letters are published each month.