Facile synthesis of nitrogen-doped porous Ni@C nanocomposites with excellent synergistically enhanced microwave absorption and thermal conductive performances

Herein, nitrogen-doped porous [email protected] ([email protected]) microwave absorbers with excellent synergistically enhanced microwave absorption and thermal management capabilities were successfully fabricated by a facile “Liquid-Solid-Solid” method. The as-synthesized [email protected] nanocomposites exhibited tunable excellent microwave absorption performances with a maximum effective absorption band (EAB) of 7.8 GHz with a thickness of 1.9 mm, and a minimum reflection loss (RL) of −54.8 dB at 13.12 GHz. The outstanding microwave absorbing performances should be attributed to the special 3D nitrogen-doped porous [email protected] hybrid hierarchical architecture, which can promote the formation of three-dimensional transmission network and provide multiple pathways of electromagnetic loss including dipolar polarization, interfacial polarization, magnetic loss and conduction loss to synergistically enhance microwave absorption performances of the absorbers. Thermal conductive experiment indicated that the as-synthesized [email protected] absorbers could significantly improve the thermal conductivity of the reference sample and exhibited excellent thermal management capacities. Thus, this work provides an idea for low-cost development of high-performance absorbing materials.