Ultrahigh Density of Atomic CoFe-Electron Synergy in Noncontinuous Carbon Matrix for Highly Efficient Magnetic Wave Adsorption

Wenhuan Huang; Qiang Qiu; Xiufang Yang; Shouwei Zuo; Jianan Bai; Huabin Zhang; Ke Pei; Renchao Che

doi:10.1007/s40820-022-00830-8

Ultrahigh Density of Atomic CoFe-Electron Synergy in Noncontinuous Carbon Matrix for Highly Efficient Magnetic Wave Adsorption

Nanomicro Lett. 2022 Apr 6;14(1):96. doi: 10.1007/s40820-022-00830-8.

Authors

Wenhuan Huang¹, Qiang Qiu², Xiufang Yang², Shouwei Zuo², Jianan Bai², Huabin Zhang³, Ke Pei⁴, Renchao Che⁵

Affiliations

¹ Key Laboratory of Chemical Additives for China National Light Industry, College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, People's Republic of China. huangwenhuan@sust.edu.cn.
² Key Laboratory of Chemical Additives for China National Light Industry, College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, People's Republic of China.
³ KAUST Catalysis Center, King Abdullah University of Science and Technology, 23955-6900, Thuwal, Kingdom of Saudi Arabia. huabin.zhang@kaust.edu.sa.
⁴ Laboratory of Advanced Materials, Shanghai Key Lab of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai, 200438, People's Republic of China.
⁵ Laboratory of Advanced Materials, Shanghai Key Lab of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai, 200438, People's Republic of China. rcche@fudan.edu.cn.

Abstract

Improving the atom utilization of metals and clarifying the M-M' interaction is both greatly significant in assembling high-performance ultra-light electromagnetic wave-absorbing materials. Herein, a high-temperature explosion strategy has been successfully applied to assemble the hierarchical porous carbon sponge with Co-Fe decoration via the pyrolysis of the energetic metal organic framework. The as-constructed hybrid displays a superior reflection loss (RL) value of - 57.7 dB and a specific RL value of - 192 dB mg^-1 mm^-1 at 12.08 GHz with a layer thickness of 2.0 mm (loading of 15 wt%). The off-axis electron hologram characterizes the highly distributed numerous polarized nanodomain variable capacitors, demonstrating the dipole and interfacial polarization along the edges of the nanopores. More importantly, the X-ray absorption spectroscopy analysis verifies the mutual interaction between the metal cluster and carbon matrix and the electronic coupling responsible for the greatly improved electromagnetic wave absorption.

Keywords: Electromagnetic wave-absorbing materials; Energetic metal organic framework; Hierarchical porous structure; M–M’ interaction; Off-axis electron hologram.