A comparative DFT study on NO2 adsorption and sensing activities of pristine, reduced and Pr3+-doped CeO2 (110) surface

IF 2.1 4区化学 Q3 CHEMISTRY, PHYSICAL Surface Science Pub Date : 2024-09-05 DOI:10.1016/j.susc.2024.122596

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Abstract

Surface site activation enhances the sensing properties of the CeO₂ (110) surface. Herein, the adsorption of nitrogen dioxide (NO₂) on pristine and modified CeO₂ (110) surfaces has been studied in detail using quantum chemical calculation. The introduction of the single praseodymium atom on the CeO₂ surface reduces its band gap from 1.93 to 0.53 eV, which in turn enhances the adsorption energy from -0.58 (pristine) to -1.34 eV (doped) and also prolongs the desorption time, indicating stronger adsorption ability. The density of states (DOS) and projected density of states (PDOS) analyses reveal that Pr doping modifies the electronic properties of the CeO₂ (110) surface which improves NO₂ sensitivity. Further, it is also observed that 0.57 eV increase in the work function for NO₂ adsorption on Pr doped CeO₂ surface, indicating stronger interaction compared to the pristine CeO₂. In contrast, reduced CeO₂ surfaces do not exhibit any significant change in sensing properties. Thus, it is understood that Pr-doped CeO₂ (Pr/CeO₂) surfaces exhibit better stability and sensitivity towards NO₂ adsorption compared to pristine and reduced surfaces. Therefore, this study provides insight into the rational design of advanced gas sensing materials based on modified CeO₂ (110) surfaces, contributing to the development of an efficient air quality monitoring system.

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原始、还原和掺杂 Pr3+ 的 CeO2 (110) 表面的二氧化氮吸附和传感活性的 DFT 比较研究

表面位点活化增强了 CeO2 (110) 表面的传感特性。本文利用量子化学计算详细研究了二氧化氮（NO2）在原始和修饰的 CeO2 (110) 表面上的吸附情况。在 CeO2 表面引入单个镨原子使其带隙从 1.93 eV 减小到 0.53 eV，从而使吸附能从-0.58（原始）提高到-1.34 eV（掺杂），并且延长了解吸时间，这表明吸附能力更强。状态密度（DOS）和投影状态密度（PDOS）分析表明，掺杂 Pr 改变了 CeO2 (110) 表面的电子特性，从而提高了对二氧化氮的敏感性。此外，还观察到掺杂 Pr 的 CeO2 表面吸附 NO₂ 的功函数增加了 0.57 eV，这表明与原始 CeO2 相比，它们之间的相互作用更强。相比之下，还原的 CeO2 表面在传感特性上没有任何明显变化。因此，与原始表面和还原表面相比，掺杂 Pr 的 CeO2（Pr/CeO2）表面对二氧化氮的吸附具有更好的稳定性和灵敏度。因此，本研究为基于改性 CeO2 (110) 表面的先进气体传感材料的合理设计提供了启示，有助于开发高效的空气质量监测系统。

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来源期刊

Surface Science 化学-物理：凝聚态物理

CiteScore

3.30

自引率

5.30%

发文量

137

审稿时长

25 days

期刊介绍： Surface Science is devoted to elucidating the fundamental aspects of chemistry and physics occurring at a wide range of surfaces and interfaces and to disseminating this knowledge fast. The journal welcomes a broad spectrum of topics, including but not limited to: • model systems (e.g. in Ultra High Vacuum) under well-controlled reactive conditions • nanoscale science and engineering, including manipulation of matter at the atomic/molecular scale and assembly phenomena • reactivity of surfaces as related to various applied areas including heterogeneous catalysis, chemistry at electrified interfaces, and semiconductors functionalization • phenomena at interfaces relevant to energy storage and conversion, and fuels production and utilization • surface reactivity for environmental protection and pollution remediation • interactions at surfaces of soft matter, including polymers and biomaterials. Both experimental and theoretical work, including modeling, is within the scope of the journal. Work published in Surface Science reaches a wide readership, from chemistry and physics to biology and materials science and engineering, providing an excellent forum for cross-fertilization of ideas and broad dissemination of scientific discoveries.