Hierarchical N, S-codoped honeycomb-like porous C@Co9S8@CNTs structure as high-performance microwave absorber

Herein, a facile method is developed to fabricate hierarchical N, S-codoped honeycomb-like porous C@Co9S8@CNTs composites, in which the coating length of carbon nanotubes (CNTs) on the surface of comby porous carbon framework could be easily controlled by the addition of cobalt chloride content in precursor. When the addition of cobalt chloride was 0.26 mmol, the longer CNTs with length of 3.1 p.m was formed, which induced have significantly on enhancement of the comprehensive microwave absorption properties of hierarchical N, S-codoped honeycomb-like porous C@Co9S8@CNTs structure. By adding only 10 wt% to paraffin, the resulting composites exhibited a maximum reflection loss of -56.0 dB at 6.5 GHz with 3.4 mm thickness, and the effective bandwidth was 4.64 GHz (5.60-7.76, 15.52-18 GHz). These outstanding microwave absorption properties were ascribed to the stronger dielectric loss by the higher aspect ratio of the CNTs. This work would provide a new direction how to design porous carbon-based microwave absorbers with high performance at low filler loading. (C) 2020 Elsevier B.V. All rights reserved.