Meng Chunfeng, Hu Pinfei, Chen Hantao, Cai Yueji, Zhou Hu, Jiang Zehong, Zhu Xiang, Liu Zeyu, Wang Chengyin, Yuan Aihua
School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu 212003, P. R. China.
School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu 212003, P. R. China.
Nanoscale. 2021 Apr 30;13(16):7751-7760. doi: 10.1039/d0nr08549a.
As a superconductive metal-organic framework (MOF) material, Cu-BHT (BHT: benzenehexathiol) can exhibit outstanding electrochemical properties owing to the potential redox reactions of the cuprous ions, sulfur species and benzene rings of Cu-BHT, but its compact texture limits the specific capacity of Cu-BHT. To improve the dense feature of Cu-BHT, rGO/Cu-BHT (rGO: reduced graphene oxide) composite materials are fabricated via a facile route and they exhibit applicable conductivities, improved lithium ion diffusion kinetics compared to pristine Cu-BHT, and sufficient redox sites. The rGO/Cu-BHT composite materials maximize the potential capacity of Cu-BHT, and the rGO/Cu-BHT 1 : 1 material achieves outstanding reversible specific capacities of 1190.4, 1230.8, 1131.4, and 898.7 mA h g-1, at current densities of 100, 200, 500, and 1000 mA g-1, respectively, superior to those of pristine Cu-BHT and rGO. These results present the promising future of 2D conductive MOFs as functional materials for energy storage, based on the regulation of electronic conductivity, redox sites, and lithium ion diffusion kinetics.
作为一种超导金属有机框架（MOF）材料，Cu-BHT（BHT：苯六硫醇）由于其亚铜离子、硫物种和苯环的潜在氧化还原反应，可展现出出色的电化学性能，但其致密的结构限制了Cu-BHT的比容量。为改善Cu-BHT的致密特性，通过简便方法制备了rGO/Cu-BHT（rGO：还原氧化石墨烯）复合材料，它们具有适用的电导率，与原始Cu-BHT相比，锂离子扩散动力学得到改善，且具有足够的氧化还原位点。rGO/Cu-BHT复合材料使Cu-BHT的潜在容量最大化，rGO/Cu-BHT 1:1材料在电流密度分别为100、200、500和1000 mA g-1时，实现了1190.4、1230.8、1131.4和898.7 mA h g-1的出色可逆比容量，优于原始Cu-BHT和rGO。基于对电子电导率、氧化还原位点和锂离子扩散动力学的调控，这些结果展现了二维导电MOF作为储能功能材料的广阔前景。
