Multifunctional WSe2/Co3C composite for efficient electromagnetic absorption, EMI shielding, and energy conversion
Yuhang Zhu, Tingting Liu, Lin Li, Mao‐Sheng Cao
Abstract
Currently, as the electromagnetic (EM) environment becomes increasingly complex, single-function EM materials can hardly resist the increasing electromagnetic interference (EMI), and there is an urgent need to develop multifunctional EM materials. In this work, multifunctional WSe2/Co3C was prepared by simple hydrothermal methods. Its dielectric performance and EM response were investigated. Efficient absorption, shielding performance, and energy conversion devices were customized. By tailoring the loading content, WSe2/Co3C can switch between EM absorption and EMI shielding. The maximum shielding effectiveness (SE) of WSe2/Co3C reached 36 dB, and high reflection loss (RL) of −60.28 dB and wide effective absorption bandwidth (EAB) of 6.16 GHz can be obtained at low thickness. The multiple EM attenuation mechanisms brought by the combination of two-dimensional (2D) WSe2 and magnetic Co3C are considered to be the main reason for the enhanced EM attenuation ability. The WSe2/Co3C composite provides a viable candidate for developing multifunctional EM materials in 2–18 GHz.