Metal–organic framework derived cobalt phosphosulfide with ultrahigh microwave absorption properties

Abstract

Nanostructure composites of ferromagnetic materials embedded in nanoporous carbon (NC) derived from metal-organic frameworks (MOFs) have attracted enormous attention due to their potential application in many fields, such as microwave absorption, energy storage, and conversion. The rational design of nanocomposites holds a determinant factor for overcoming the challenges involving the microwave absorption performance. Herein, CoS/NC, CoP/NC, and CoSP/NC with a rhombic dodecahedral structure have been successfully fabricated by using the template cobalt-based MOFs (ZIF-67). A morphology analysis indicates that ferromagnetic nanoparticles are embedded in NC matrix. It is obvious that the rhombic dodecahedron can be maintained after the phosphorization and sulfurization of Co/NC derived from the thermal decomposition of ZIF-67. The microwave absorption performance can obviously be improved by the phosphorization and sulfurization of Co/NC. CoSP/NC exhibits an excellent microwave absorption property and the minimum reflection loss (RL) of CoSP/NC can reach -68 dB at 14.6 GHz with a thickness of 1.5 mm. An RL value less than -10 dB can be achieved in the microwave frequency range of 12.7-17.3 GHz (4.6 GHz) with a thickness of 1.5 mm for CoSP/NC. This article offers a novel way to fabricate cobalt-based materials/carbon composites for an excellent microwave absorber.

Research Progress of Metal Organic Frameworks/Carbon‐Based Composites for Microwave Absorption

“…Ferrite, metal particle, carbon, and conductive polymer materials can be used in microwave absorption, but they have some disadvantages such as poor impedance matching and poor absorption performance when used alone. [128][129][130][131] For example, ferromagnetic metals such as iron, cobalt, nickel, and their alloys have strong absorption strength, but their disadvantages such as narrow absorption bandwidth and high density limit their practical applications. In contrast, carbon-based materials such as graphene and carbon nanotubes are excellent light microwave absorption materials.…”

“…Some studies have shown that the introduction of nonmetallic heteroatoms (such as nitrogen and boron atoms) into carbon materials can lead to electronic modulation, resulting in improving the microwave shielding performance. [170,171] The work of Ruan et al [129] showed that the phosphating and vulcanization of Co/NC can obviously improve the microwave absorption properties of the composite. They embedded ferromagnetic nanoparticles into NC matrix and successfully prepared CoS 2 / NC (nanoporous carbon), CoP/NC, and CoS 2-x P x /NC with rhombic dodecahedral structure based on Co-MOFs (ZIF-67).…”

Cu0.33@Co0.22Ni0.45 core–shell nanoparticles as hydrogen generation catalysts via hydrolysis of ammonia borane

“…[1][2][3] Currently, research is being conducted worldwide to develop the technologies of hydrogen production and storage. 4 Numerous hydrogen storage materials have been investigated including metal hydrides, 5 hydrogen storage adsorption materials, 6 organic hydrogen storage materials, 7 and ligand hydrides, 8 among others.…”

Preparation of Ni/C porous fibers derived from jute fibers for high-performance microwave absorption

“…With the widespread application of electronic and electrical equipment, wireless communication systems, and radar stealth technology, electromagnetic pollution and radiation problems have become increasingly serious, especially in the GHz band. 1,2 The most effective way to solve these issues is to use highefficiency microwave absorbing materials (MAMs) to absorb the electromagnetic waves and avoid strong electromagnetic wave reection and secondary pollution. 3,4 Hence, a considerable amount of effort has been devoted to the preparation of MAMs with multiple performance requirements.…”