In situ growth of CoNi bimetallic alloys inside polyetheretherketone-derived hierarchical porous carbon as a broadband and efficient electromagnetic wave absorber. Issue 45 (3rd November 2022)

• Record Type: Journal Article
• Authors: Xu, Pan; Meng, Lingcheng; He, Hongru; Qi, Desheng; Wang, Shan; Fang, Jiyong; Yue, Xigui
• Is Part Of: Dalton transactions. Volume 51:Issue 45(2022)
• Page Start: 17430
• Page End: 17440
• Publication Date: 2022-11-03
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d2dt03239b
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : A polyetheretherketone-derived hierarchical porous carbon/CoNi bimetallic alloys composite has demonstrated great potential for application in the field of electromagnetic wave absorption. Abstract : Both morphological structure and chemical composition are the important factors that determine the electromagnetic wave (EMW) absorption properties of EMW absorbers. Herein, hierarchical porous carbon (HPPC) was synthesized by using polyetheretherketone (PEEK) as the starting material via the salt template method combined with KOH activation. Then, taking advantage of the hierarchical porous characteristics of the carbon, a novel EMW absorber (HPPC/CoNi) was synthesized by in situ growth of CoNi bimetallic alloys inside the above porous carbon. The as-synthesized HPPC/CoNi exhibits excellent EMW absorption performance with a minimum reflection loss (RLmin ) value of −65.56 dB at 2.00 mm and a maximum effective absorption bandwidth (EAB) of 5.92 GHz at 1.80 mm. The superior EMW absorption property is ascribable to the multiple reflection/scattering induced by the hierarchical porous structure of HPPC, dielectric loss, magnetic loss, and good impedance matching. The results show that HPPC/CoNi is a potential EMW absorber with characteristics of ultra-light weight, ultrathin thickness, broad bandwidth, and strong absorption.