Metal Ions Confined in Periodic Pores of MOFs to Embed Single-Metal Atoms within Hierarchically Porous Carbon Nanoflowers for High-Performance Electromagnetic Wave Absorption,Advanced Functional Materials

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Metal Ions Confined in Periodic Pores of MOFs to Embed Single-Metal Atoms within Hierarchically Porous Carbon Nanoflowers for High-Performance Electromagnetic Wave Absorption
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-11-30 , DOI: 10.1002/adfm.202210456
Xinci Zhang ₁ , Bei Li ₁ , Jia Xu ₁ , Xiao Zhang ₁ , Yanan Shi ₁ , Chunling Zhu ₂ , Xitian Zhang ₃ , Yujin Chen _{1,

2,

4}

Affiliation

Nanocarbons with single-metal atoms (M-SAs) have displayed considerable potential in various fields of application due to high free energy of M-SAs and strong metal-support interaction. However, the uniform dispersion of M-SAs within the whole carbon matrix still remains a great challenge. Herein, Ni-SAs are uniformly dispersed within hierarchically porous carbon nanoflowers (Ni-SA/HPCF) via a spatial confinement of Ni ions within the periodic pores in metal-organic frameworks (MOFs) with a subsequent carbonization process. The Ni-SA/HPCF with abundant mesopores and an ultrahigh surface area (1137.2 m² g⁻¹) exhibits unexpected electromagnetic wave (EMW) absorption property with a minimal reflection loss of –53.2 dB and an effective absorption bandwidth of 5.0 GHz, while the filler ratio in the matrix is merely 10 wt.%. Density functional theory calculations and experimental results reveal that the uniformly dispersed Ni-SAs break local symmetry of the electronic structure and increase electrical conductivity of host carbon matrix, thereby enhancing the EMW absorption properties. In addition, the unique 3D hierarchical porous morphology boosts the impedance matching property, which synergistically improves the EMW absorption performance of the Ni-SA/HPCF. This study provides an efficient approach to uniformly disperse M-SAs within hierarchically porous nanocarbons for EMW absorption and other potential applications.

中文翻译：

限制在 MOF 周期性孔隙中的金属离子将单金属原子嵌入分级多孔碳纳米花中以实现高性能电磁波吸收

由于M-SAs的高自由能和强金属-载体相互作用，具有单金属原子的纳米碳（M-SAs）在各个应用领域显示出相当大的潜力。然而，M-SAs 在整个碳基质中的均匀分散仍然是一个巨大的挑战。在此，Ni-SAs 通过金属有机骨架 (MOFs) 周期性孔隙内的 Ni 离子空间限制以及随后的碳化过程均匀分散在分级多孔碳纳米花 (Ni-SA/HPCF) 中。Ni-SA/HPCF 具有丰富的中孔和超高比表面积 (1137.2 m ² g ⁻¹) 表现出意想不到的电磁波 (EMW) 吸收性能，最小反射损耗为 –53.2 dB，有效吸收带宽为 5.0 GHz，而基质中的填料比例仅为 10 wt.%。密度泛函理论计算和实验结果表明，均匀分散的 Ni-SAs 打破了电子结构的局部对称性，增加了主体碳基体的电导率，从而增强了 EMW 吸收性能。此外，独特的 3D 分层多孔形态增强了阻抗匹配特性，协同提高了 Ni-SA/HPCF 的 EMW 吸收性能。这项研究提供了一种有效的方法，可以将 M-SA 均匀分散在分级多孔纳米碳中，用于 EMW 吸收和其他潜在应用。

更新日期：2022-11-30

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