2025-07-27
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Electromagnetic wave absorption materials inevitably encounter corrosive conditions during service, making corrosion-resistant design essential for their practical deployment.
Researchers from China's Northwestern Polytechnical University have developed a magnetic graphene composite aerogel (reduced graphene oxide (rGO)/ porous hollow Ni/C microspheres (PHNiC)). The new aerogel reportedly demonstrates excellent impedance matching and electromagnetic attenuation, achieving a minimum reflection loss of −51.3 dB at a thickness of 2.5 mm and a broad effective absorption bandwidth of 6.64 GHz.
In addition, the conformal encapsulation of magnetic nanoparticles with rGO establishes a corrosion-mitigating barrier through interfacial passivation, effectively suppressing electrolyte penetration and anodic dissolution.
Consequently, the rGO/PHNiC aerogel exhibits significantly improved corrosion resistance, with a corrosion potential of –0.45 V vs. saturated calomel electrode and a corrosion current density of 3.3 μA, demonstrating over 90% reduction in corrosion rate compared to uncoated counterparts.
This study provides valuable insights for the design of microwave absorbing materials that function in complex environments.
Read the original article on Graphene-Info.