Abstract Metal-organic framework (MOF)-derived functional composites have received extensive attention, especially in microwave absorption (MA) materials. However, the delicate design of the spatial structure, designed components, and heterojunction interfaces of MOF derivatives remains a great challenge in the MA application. Herein, a simple double organic ligand strategy and controllable pyrolysis treatment were used to regulate the Ni-MOF derived pomegranate-like Ni@C Microspheres. Their morphology and crystallization can be accurately controlled by a simple hydrothermal method. After pyrolysis, hierarchical magnetic-carbon Ni@C microspheres were obtained which consists of many nickel-carbon core–shell units within the carbon layer. MOF-derived Ni@C microspheres possessed plentiful interfaces, unique three-dimensional conduction network, and magnetic-dielectric synergy system. The pomegranate-like Ni@C microspheres shown excellent microwave absorption performance of a maximum reflection loss (−46.9 dB at 3.5 mm), which can be attributed to the dielectric attenuation, magnetic loss, and matched impedance. Precision regulation of MOF precursors and MOF derivatives provide a novel platform of magnetic-dielectric Ni@C composites that offers excellent MA applications.

中文翻译：

---

双配体MOF衍生的类石榴Ni@C微球作为高性能微波吸收剂

摘要 金属有机骨架（MOF）衍生的功能复合材料受到广泛关注，尤其是在微波吸收（MA）材料中。然而，MOF衍生物的空间结构、设计组件和异质结界面的精细设计仍然是MA应用中的一大挑战。在此，使用简单的双有机配体策略和可控的热解处理来调节 Ni-MOF 衍生的类石榴 Ni@C 微球。它们的形态和结晶可以通过简单的水热方法精确控制。热解后，得到分层磁性碳Ni@C微球，其由碳层内的许多镍碳核壳单元组成。MOF 衍生的 Ni@C 微球具有丰富的界面、独特的三维传导网络、和磁介质协同系统。石榴状 Ni@C 微球表现出优异的微波吸收性能，最大反射损耗（-46.9 dB at 3.5 mm）可归因于介电衰减、磁损耗和匹配阻抗。MOF 前体和 MOF 衍生物的精确调节提供了一个新的磁介电 Ni@C 复合材料平台，提供了出色的 MA 应用。