“Heterodimensional Structure” Integrated Defect and Interface Engineering for Efficiently EMI Shielding and Electrochemical Response

Abstract

Two colossal global challenges remain energy scarcity and environmental pollution, having evolved into problems that human society cannot ignore. Therefore, developing a material with efficient electromagnetic (EM) interference shielding and electrocatalytic properties has become imperative in promoting sustainable development and establishing environmental protection systems. Herein, a heterodimensional structure is prepared by assembling 3D spirally grown VS2 with 2D FeCo‐LDH, which precisely manipulates macroscopic EM and electrochemical characteristics through defect and interface engineering. The results show that the heterodimensional structure presents an efficient shielding effectiveness of 30.2 dB at 18 GHz. Heterodimensional structure exhibits a low overpotential of 279 mV, achieving a current density of 10 mA cm−2 and a desirable stability. In addition, based on the unique electrochemical properties and EM response characteristics of the material, a special protective helmet is innovated. The helmet incorporating an autonomous oxygen supply, advanced pressure surveillance, and dynamic stealth supports a more exhaustive safeguard for missions amidst noxious gases, and situations necessitating clandestine operations. This research provides a new idea for the development of multifunctional EM active materials, showing great application prospects in the fields of aerospace engineering, energy, and EM security protection.

Ultraflexible Ultrathin 3D/1D Hierarchical Interpenetrating Ni-MOF/CNT Buckypaper Composites: Microstructures and Microwave Absorption Properties

“…Within the Ni-MOF/CNT BP, the 3D Ni-MOF secondary building blocks form a hierarchical interpenetrating structure with the CNT monofilament. 41 The conductive network structure formed by CNTs provides more electron transport pathways and increases the conductive losses. The modification of 3D Ni-MOF not only improves the impedance matching of CNTs, but the framework structure with rich interfaces also provides multiple reflections/ scatterings for attenuating microwave energy.…”

“…In this work, three-dimensional (3D) porous Ni-MOF was grown in situ on CNT monofilament; then, the flexible and self-supporting Ni-MOF/CNT BP was further constructed through a self-designed directional pressure filtration technology. Within the Ni-MOF/CNT BP, the 3D Ni-MOF secondary building blocks form a hierarchical interpenetrating structure with the CNT monofilament . The conductive network structure formed by CNTs provides more electron transport pathways and increases the conductive losses.…”