Metal Valence State Modulation Strategy to Design Core@shell Hollow Carbon Microspheres@MoSe2/MoOx Multicomponent Composites for Anti‐Corrosion and Microwave Absorption

• Published in: Small (Weinheim an der Bergstrasse, Germany) Vol. 21; no. 16; pp. e2311312 - n/a
• Main Authors: Xiao, Junxiong, Zhan, Beibei, Qi, Xiaosi, Ding, Junfei, Qu, Yunpeng, Gong, Xiu, Yang, Jing‐Liang, Wang, Lei, Zhong, Wei, Che, Renchao
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 23.04.2025
• Subjects: Carbon; Composite materials; Conduction losses; core@shell structure; Corrosion; Heat treatment; hollow carbon microspheres@MoSe2/MoOx; Hydrothermal reactions; Impedance matching; improved conduction and polarization loss; metal valence state modulation; Microspheres; Microwave absorption; Modulation; Molybdenum compounds; Valence
• ISSN: 1613-6810; 1613-6829; 1613-6829
• DOI: 10.1002/smll.202311312

The exploitation of multicomponent composites (MCCs) has become the main pathway for obtaining advanced microwave absorption materials (MAMs). Herein, a metal valence state modulation strategy is proposed to tune the electromagnetic (EM) parameters and improve microwave absorption performances. Core@shell hollow carbon microspheres@MoSe2 and hollow carbon microspheres@MoSe2/MoOx MCCs with various mixed‐valence states content are well‐designed and produced by a simple hydrothermal reaction or/and heat treatment process. The results reveal that the thermal treatment of hollow carbon microspheres@MoSe2 in Ar and Ar/H2 leads to the in situ formation of MoOx and multivalence state, respectively, and the enhanced content of Mo4+ in the designed MCCs greatly boosts their impedance matching characteristics, polarization, and conduction loss capacities, which lead to their evidently improved EM wave absorption properties. Amongst, the as‐prepared hollow carbon microspheres@MoSe2/MoOx MCCs achieve an effective absorption bandwidth of 5.80 GHz under a matching thickness of 1.97 mm and minimum reflection loss of −21.49 dB. Therefore, this work offers a simple and universal method to fabricate core@shell hollow carbon microspheres@MoSe2/MoOx MCCs, and a novel and feasible metal valence state modulation strategy is proposed to develop high‐efficiency MAMs. Metal valence state modulation strategy is adopted to design core@shell structured hollow carbon spheres@MoSe2/MoOx multicomponent nanocomposites for their boosted impedance matching characteristics, conduction and polarization loss abilities, and comprehensive microwave absorption properties.