Influence of an external electric field on the catalytic CO oxidation of nanoscaled CeO₂ and its La³⁺ and Gd³⁺ congeners.

IF 3.5 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Beilstein Journal of Nanotechnology Pub Date : 2026-08-04 eCollection Date: 2026-01-01 DOI:10.3762/bjnano.17.70

Parastoo Jamshidi, Silvio Heinschke, Jörg J Schneider

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Abstract

Herein, we investigate how aliovalent doping and application of an external electrical field modulates the catalytic activity of nanoscale ceria (nCeO₂) towards CO oxidation. Gd³⁺ and La³⁺ were doped into the nCeO₂ lattice. Such doping influences the concentration and mobility of oxygen vacancies, which are promoting CO oxidation to CO₂. When applying an electric potential, charge transport within nCeO₂ is modulated. Our results show that both dopants Gd³⁺ and La³⁺ lead to an increasing V_O concentration, whereas the impact of the applied potential on the oxidation behaviour varies with catalyst composition. The applied electric potential markedly improves the activity of undoped nCeO₂ and 5% Gd³⁺-doped nCeO₂; however, it causes no significant change in CO oxidation capability in 2.5% Gd³⁺-doped and La³⁺-doped samples. These findings can be understood considering the applied potential and its influence on the polaron mobility and V_O arrangement, which are controlled by the underlying oxidic defect structure.

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外加电场对纳米CeO2及其La3+和Gd3+同系物催化CO氧化的影响

在此，我们研究了共价掺杂和外电场的应用如何调节纳米级二氧化铈（nCeO2）对CO氧化的催化活性。在nCeO2晶格中掺杂了Gd3+和La3+。这种掺杂影响了氧空位的浓度和迁移率，促进了CO氧化为CO2。当施加电势时，nCeO2内部的电荷传输被调制。我们的研究结果表明，掺杂剂Gd3+和La3+都会导致VO浓度的增加，而施加电位对氧化行为的影响随催化剂组成的不同而不同。外加电位显著提高了未掺杂nCeO2和5% Gd3+掺杂nCeO2的活性；然而，2.5% Gd3+掺杂和La3+掺杂样品的CO氧化能力没有明显变化。考虑到应用电位及其对极化子迁移率和VO排列的影响，这些发现可以理解，而极化子迁移率和VO排列是由潜在的氧化缺陷结构控制的。

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

Beilstein Journal of Nanotechnology NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

5.70

自引率

3.20%

发文量

109

审稿时长

2 months

期刊介绍： The Beilstein Journal of Nanotechnology is an international, peer-reviewed, Open Access journal. It provides a unique platform for rapid publication without any charges (free for author and reader) – Platinum Open Access. The content is freely accessible 365 days a year to any user worldwide. Articles are available online immediately upon publication and are publicly archived in all major repositories. In addition, it provides a platform for publishing thematic issues (theme-based collections of articles) on topical issues in nanoscience and nanotechnology. The journal is published and completely funded by the Beilstein-Institut, a non-profit foundation located in Frankfurt am Main, Germany. The editor-in-chief is Professor Thomas Schimmel – Karlsruhe Institute of Technology. He is supported by more than 20 associate editors who are responsible for a particular subject area within the scope of the journal.