Identification of the Intrinsic Dielectric Properties of Metal Single Atoms for Electromagnetic Wave Absorption
Corresponding Author: Yujin Chen
Nano-Micro Letters,
Vol. 14 (2022), Article Number: 27
Abstract
Atomically dispersed metals on N-doped carbon supports (M–NxCs) have great potential applications in various fields. However, a precise understanding of the definitive relationship between the configuration of metal single atoms and the dielectric loss properties of M–NxCs at the atomic-level is still lacking. Herein, we report a general approach to synthesize a series of three-dimensional (3D) honeycomb-like M–NxC (M = Mn, Fe, Co, Cu, or Ni) containing metal single atoms. Experimental results indicate that 3D M–NxCs exhibit a greatly enhanced dielectric loss compared with that of the NC matrix. Theoretical calculations demonstrate that the density of states of the d orbitals near the Fermi level is significantly increased and additional electrical dipoles are induced due to the destruction of the symmetry of the local microstructure, which enhances conductive loss and dipolar polarization loss of 3D M–NxCs, respectively. Consequently, these 3D M–NxCs exhibit excellent electromagnetic wave absorption properties, outperforming the most commonly reported absorbers. This study systematically explains the mechanism of dielectric loss at the atomic level for the first time and is of significance to the rational design of high-efficiency electromagnetic wave absorbing materials containing metal single atoms.
Highlights:
1 A general method was developed to fabricate a series of honeycomb-like N-doped nanocarbons (3D M–NxC) doped with metal single atoms (Mn, Fe, Co, Cu, or Ni) with a high yield.
2 The intrinsic dielectric properties of 3D M–NxC were identified for the first time at the atomic-level, revealing that the introduction of metal single atoms greatly increases both conductive loss and polarization loss.
3 3D Mn–NC exhibited high-performance electromagnetic wave absorption at a low filler loading of 10 wt% outperforming most reported absorbers.
Keywords
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M. Tong, F. Sun, Y. Xie, Y. Wang, Y. Yang et al., Operando cooperated catalytic mechanism of atomically dispersed Cu@N4 and Zn@N4 for promoting oxygen reduction reaction. Angew. Chem. Int. Ed. 60, 14005–14012 (2021). https://doi.org/10.1002/anie.202102053
A. Kaplan, E. Korin, A. Bettelheim, Structures self-assembled from anionic graphene and cationic manganese porphyrin: characterization and application in artificial photosynthesis. Eur. J. Inorg. Chem. 2014(13), 2288–2295 (2014). https://doi.org/10.1002/ejic.201400054
G. Mele, R. Sole, G. Vasapollo, G. Marcı, E. Garcia et al., TRMC, XPS, and EPR characterizations of polycrystalline TiO2 porphyrin impregnated powders and their catalytic activity for 4-nitrophenol photodegradation in aqueous suspension. J. Phys. Chem. B 109, 12347–12352 (2005). https://doi.org/10.1021/jp044253g
S. Camiato, H. Roulet, G. Dufour, S. Palacin, S. Barraud et al., Electronic structure of nitrogen square planar copper complexes in langmuir-blodgett films. J. Phys. Chem. 96, 7072–7075 (1992). https://doi.org/10.1016/0040-6090(92)90329-A
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A.P. Grosvenor, B.A. Kobe, M.C. Biesinger, N.S. McIntyre, Investigation of multiplet splitting of Fe 2p xps spectra and bonding in iron compounds. Surface Interface Anal. 36(12), 1564–1574 (2004). https://doi.org/10.1002/sia.1984
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P. He, M.S. Cao, J.C. Shu, Y.Z. Cai, X.X. Wang et al., Atomic layer tailoring titanium carbide MXene to tune transport and polarization for utilization of electromagnetic energy beyond solar and chemical energy. ACS Appl. Mater. Interfaces 11(13), 12535–12543 (2019). https://doi.org/10.1021/acsami.9b00593
H. Wu, J. Liu, H. Liang, D. Zang, Sandwich-like Fe3O4/Fe3S4 composites for electromagnetic wave absorption. Chem. Eng. J. 393, 124743 (2020). https://doi.org/10.1016/j.cej.2020.124743
J.C. Shu, M.S. Cao, M. Zhang, X.X. Wang, W.Q. Cao et al., Molecular patching engineering to drive energy conversion as efficient and environment-friendly cell toward wireless power transmission. Adv. Funct. Mater. 30(10), 1908299 (2020). https://doi.org/10.1002/adfm.201908299
H. Yuan, B. Li, C. Zhu, Y. Xie, Y. Jiang et al., Dielectric behavior of single iron atoms dispersed on nitrogen-doped nanocarbon. Appl. Phys. Lett. 116(15), 153101 (2020). https://doi.org/10.1063/1.5143154
T. Gao, Z. Zhu, Y. Li, H. Hu, H. Rong et al., Highly efficient electromagnetic absorption on ZnN4-based MOFs-derived carbon composites. Carbon 177, 44–51 (2021). https://doi.org/10.1016/j.carbon.2021.02.061
J.-P. Chen, Y.-F. Du, Z.-F. Wang, L.-L. Liang, H. Jia et al., Anchoring of SiC whiskers on the hollow carbon microspheres inducing interfacial polarization to promote electromagnetic wave attenuation capability. Carbon 175, 11–19 (2021). https://doi.org/10.1016/j.carbon.2020.12.073
W. Tian, J. Li, Y. Liu, R. Ali, Y. Guo et al., Atomic-scale layer-by-layer deposition of fesial@ZnO@Al2O3 hybrid with threshold anti-corrosion and ultra-high microwave absorption properties in low-frequency bands. Nano-Micro Lett. 13(1), 161 (2021). https://doi.org/10.1007/s40820-021-00678-4
X. Zhang, J. Qiao, Y. Jiang, F. Wang, X. Tian et al., Carbon-based MOF derivatives: emerging efficient electromagnetic wave absorption agents. Nano-Micro Lett. 13(1), 135 (2021). https://doi.org/10.1007/s40820-021-00658-8
D. Guo, H. Yuan, X. Wang, C. Zhu, Y. Chen, Urchin-like amorphous nitrogen-doped carbon nanotubes encapsulated with transition-metal-alloy@graphene core@shell nanoparticles for microwave energy attenuation. ACS Appl. Mater. Interfaces 12(8), 9628–9636 (2020). https://doi.org/10.1021/acsami.9b20412
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