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. 2022 Apr 6;14:96. doi: 10.1007/s40820-022-00830-8

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© The Author(s) 2022

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — Analyses of Co-Fe interaction in CoFe@PCS. a The real part and b imaginary part of permittivity. c Real part and d) imaginary part of permeability for Fe–N₄, Co–N₄, CoFe–N₄ in Fe@PCS, Co@PCS, and CoFe@PCS. e K-edge EXAFS spectra for Co foil, Co PC, and CoFe@PCS. f K-edge EXAFS spectra for Fe foil, Fe PC, and CoFe@PCS. g Experimental XANES spectra. h-i Wavelet transform for the k²-weighted EXAFS signals. j-k The permittivity and permeability of Fe–N₄, Co–N₄, and CoFe–N₄ in Fe@PCS, Co@PCS, and CoFe@PCS