Hierarchical Co2P/CoS2@C@MoS2 Composites with Hollow Cavity and Multiple Phases Toward Wideband Electromagnetic Wave Absorption

• Published in: Small (Weinheim an der Bergstrasse, Germany) Vol. 20; no. 6
• Main Authors: He, Zizhuang, Xu, Hanxiao, Shi, Lingzi, Ren, Xiangru, Kong, Jie, Liu, Panbo
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 01.02.2024
• Subjects: Absorption; Broadband; Cobalt sulfide; Composite materials; Crystal defects; Electromagnetic radiation; electromagnetic wave absorption; hierarchical structures; Holes; hollow engineering; Lattice vacancies; Molybdenum disulfide; multiple hetero‐interfaces; phase transition; Phase transitions; Structural stability; Synergistic effect
• ISSN: 1613-6810; 1613-6829
• DOI: 10.1002/smll.202306253

The synergistic effect of hollow cavities and multiple hetero‐interfaces displays huge advantages in achieving lightweight and high‐efficient electromagnetic wave absorption, but still confronts huge challenges. Herein, hierarchical Co2P/CoS2@C@MoS2 composites via the self‐sacrificed strategy and a subsequent hydrothermal method have been successfully synthesized. Specifically, ZIF‐67 cores first act as the structural template to form core‐shell ZIF‐67@poly(cyclotriphosphazene‐co‐4,4′‐sulfonyldiphenol) (ZIF‐67@PZS) composites, which are converted into hollow Co2P@C shells with micro‐mesoporous characteristics because of the gradient structural stabilities and preferred coordination ability. The deposition of hierarchical MoS2 results in phase transition (Co2P→Co2P/CoS2), yielding the formation of hierarchical Co2P/CoS2@C@MoS2 composites with hollow cavities and multiple hetero‐interfaces. Benefiting from the cooperative advantages of hollow structure, extra N,P,S‐doped sources, lattice defects/vacancies, diverse incoherent interfaces, and hierarchical configurations, the composites deliver superior electromagnetic wave capability (−56.6 dB) and wideband absorption bandwidth (8.96 GHz) with 20 wt.% filler loading. This study provides a reliable and facile strategy for the precise construction of superior electromagnetic wave absorbents with efficient absorption attenuation. In this manuscript, the authors construct hierarchical Co2P/CoS2@C@MoS2 composites via the self‐sacrificed strategy and a subsequent hydrothermal method, the cooperative advantages of hollow cavity and multiple hetero‐interfaces endow the composites optimized matching impedance and superior electromagnetic wave absorption.