Environment-Stable Co_xNi_y Encapsulation in Stacked Porous Carbon Nanosheets for Enhanced Microwave Absorption

Magnetic/dielectric@porous carbon composites, derived from metal-organic frameworks (MOFs) with adjustable composition ratio, have attracted wide attention due to their unique magnetoelectric properties. In addition, MOFs-derived porous carbon-based materials can meet the needs of lightweight feature. This paper reports a simple process for synthesizing stacked Co_xNi_y@C nanosheets derived from Co_xNi_y-MOFs nanosheets with multiple interfaces, which is good to the microwave response. The Co_xNi_y@C with controllable composition can be obtained by adjusting the ratio of Co²⁺ and Ni²⁺. It is supposed that the increased Co content is benefit to the dielectric and magnetic loss. Additionally, the bandwidth of CoNi@C nanosheets can take up almost the whole Ku band. Moreover, this composite has better environmental stability in air, which characteristic provides a sustainable potential for the practical application.