FeNi LDH/Loofah Sponge-Derived Magnetic FeNi Alloy Nanosheet Array/Porous Carbon Hybrids with Efficient Electromagnetic Wave Absorption

Abstract

Electromagnetic wave (EMW) absorption materials have tremendous potential in protecting national security and human health from harmful electromagnetic irradiation. However, it is still a great challenge to achieve lightweight and broadband high-performance EMW absorption. Integrating layered double hydroxides (LDH) with porous biomass materials is a promising approach to construct magnetic metal/porous carbon composites as highly efficient EMW absorption materials due to their synergy loss, lightweight, and low-cost characteristics. Herein, FeNi alloy nanosheet array/porous carbon (FeNi/PC) hybrids derived from FeNi/loofah sponges have been prepared by hydrothermal and subsequent carbonization processes. As expected, the FeNi/PC hybrids achieve a high reflection loss of −58.3 dB at 2.98 mm and exhibits a broad effective absorption bandwidth (EAB) of 6.72 GHz with 8 wt % filler content. The outstanding EMW absorption performance of the FeNi/PC hybrid provides a new insight into the design of biomass-based composite materials as lightweight and broadband high-performance EMW absorbers.