The Electron Migration Polarization Boosting Electromagnetic Wave Absorption Based on Ce Atoms Modulated yolk@shell Fex N@NGC

Zhenhui Ma; Ke Yang; Da Li; Hu Liu; Shengchong Hui; Yuying Jiang; Siyuan Li; Yiming Li; Wang Yang; Hongjing Wu; Yanglong Hou

doi:10.1002/adma.202314233

The Electron Migration Polarization Boosting Electromagnetic Wave Absorption Based on Ce Atoms Modulated yolk@shell Fe_x N@NGC

Adv Mater. 2024 Feb 21:e2314233. doi: 10.1002/adma.202314233. Online ahead of print.

Authors

Zhenhui Ma¹, Ke Yang¹, Da Li², Hu Liu³, Shengchong Hui⁴, Yuying Jiang¹, Siyuan Li⁵, Yiming Li¹, Wang Yang⁵, Hongjing Wu⁴, Yanglong Hou^{6

7}

Affiliations

¹ Department of Physics, Beijing Technology and Business University, Beijing, 100048, China.
² School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, 518172, China.
³ School of Chemistry and Chemical Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
⁴ MOE Key Laboratory of Material Physics and Chemistry under Extraordinary, School of Physical Science and Technology Northwestern Polytechnical University, Xi'an, 710072, China.
⁵ State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing, 102249, China.
⁶ Beijing Key Laboratory for Magnetoelectric Materials and Devices, School of Materials Science and Engineering, Peking University, Beijing, 100871, China.
⁷ School of Materials, Shenzhen Campus of Sun Yat-Sen University, Shenzhen, 518107, China.

PMID: 38380795
DOI: 10.1002/adma.202314233

Abstract

The electron migration polarization is considered as a promising approach to optimize electromagnetic waves (EMW) dissipation. However, it is still difficult to realize well-controlled electron migration and elucidate the related EMW loss mechanisms for current researches. Herein, a novel Fe_x N@NGC/Ce system to construct an effective electron migration model based on the electron leaps among the 4f/5d/6s orbitals of Ce ions is explored. In Fe₄ N@NGC/Ce_SA+Cs+NPs , Ce single-atoms (SA) mainly represent a +3 valence state, which can feed the electrons to Ce⁴⁺ of clusters (Cs) and CeO₂ nanoparticles (NPs) through a conductive network under EMW, leading to the electron migration polarization. Such electron migration loss combined with excellent magnetic loss provided by Fe₄ N core, results in the optimal EMW attenuation performance with a minimum reflection loss exceeds -85.1 dB and a broadened absorption bandwidth up to 7.5 GHz at 1.5 mm. This study clarifies the in-depth relationship between electron migration polarization and EMW dissipation, providing profound insights into developing well-coordinated magnetic-dielectric nanocomposites for EMW absorption engineering.

Keywords: Ce single-atoms; FexN@NGC; electromagnetic wave absorption; electron migration polarization.

Abstract

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