@article{Liu2025, 
author = {Jiang-Tao Liu and Yu-Chen Zheng and Chen-Yu Jiang and Xin Hou and Xue-Rong Feng and Ke Jiang and Wenwen Wang and Ming Wang},
title = {Cobalt-cobalt oxide doped lignin-based carbon materials for microwave absorption via microwave carbonization},
year = {2025},
journal = {Nano Research},
volume = {18},
number = {9},
pages = {94907640},
keywords = {microwave absorption, metal-organic framework (MOF), industrial black powder, microwave pyrolysis},
url = {https://www.sciopen.com/article/10.26599/NR.2025.94907640},
doi = {10.26599/NR.2025.94907640},
abstract = {With the escalating concerns over environmental pollution, effective management of industrial waste has emerged as a critical research focus in modern materials science. In this study, we developed cobalt-cobalt oxide doped lignin-based porous carbon materials (Co@CoO@MPC) by employing zeolitic imidazolate framework-67 (ZIF-67) decorated with industrial black powder—a byproduct rich in lignin and carbon. The synthesis involved potassium hydroxide (KOH)-assisted microwave activation, which enabled the creation of a porous structure, thereby markedly increasing the specific surface area and interfacial properties of the composites. During pyrolysis, ZIF-67 underwent transformation into cobalt (Co) and cobalt oxide (CoO) phases. The synergistic interaction between Co/CoO and the porous carbon significantly enhanced microwave absorption through both dielectric and magnetic loss mechanisms. The Co@CoO@MPC composites demonstrated exceptional microwave absorption properties across a broad frequency range, particularly at higher frequencies. Specifically, the sample after 2-min microwave irradiation exhibits a high EAB value of 5.7 GHz (1.6 mm thickness) and an RLmin value of −30 dB (2.0 mm thickness). This research not only offers an innovative approach to recovering resources from industrial black powder but also provides groundbreaking strategies for developing high-performance microwave-absorbing materials.}
}