Professor Sun Daofeng from the School of Materials Science and Engineering collaborated with Professor Zhou Hongcai from Texas A&M University in the United States to make breakthrough progress in the preparation of supercapacitor electrode materials through controlled alkaline hydrolysis of MOFs. Related paper "Controlled Hydrolysis of Metal-Organic Frameworks: Hierarchical Ni/Co-Layered Double Hydroxide Microspheres for High Performance Supercapacitors" (Controlled Hydrolysis of Metal-Organic Frameworks: Hierarchical Ni/Co-Layered Double Hydroxide Microspheres for High Performance Supercapacitors) in June 2019 Published by ACSNano, an authoritative international journal in the field of materials. Doctoral student Xiao Zhenyu and master student Mei Yingjie of our school are the co-first authors, Professor Sun Daofeng and Professor Zhou Hongcai are the co-corresponding authors, and China University of Petroleum (East China) is the first signing unit. In recent years, metal-organic frameworks (MOFs), as a new type of porous material, are considered to be an ideal candidate for preparing nano-oxides due to their ultra-high specific surface area, rich pore structure, and highly dispersed metal centers. materials, porous carbon materials and precursors of composite materials. At present, the preparation methods of MOFs-derived materials are mostly limited to traditional pyrolysis strategies. Since the reaction is carried out under high temperature conditions, the process is complex, the controllability is poor, and it is extremely sensitive to the gas environment, which can easily cause skeleton collapse, metal center agglomeration and pores. Structural clogging and other phenomena; at the same time, the pyrolysis process will inevitably lead to the decomposition of expensive organic ligands in MOFs and the emission of toxic and harmful gases, which increases the economic and environmental costs of the synthesis process and limits the possibility of large-scale industrial application. Based on the above problems, Sun Daofeng's team adopted an alkaline hydrolysis (hydrolysis under alkaline conditions) strategy to gradually replace the organic ligand anions in MOFs with OH- anions with relatively strong coordination ability, and finally realized MOFs-derived nanomaterials under mild and controllable conditions. preparation. For the first time, the reaction process was tracked through isotope tracking technology in the experiment, which revealed the reaction mechanism in depth. The results showed that μ3-OH bridged metal clusters in MOFs play a crucial role in the "conformal transformation" process, providing a basis for the development of MOFs-derived materials. Controlled alkaline hydrolysis provides effective guidance. The Ni/Co-LDH-7:3 sample prepared by the alkaline hydrolysis method has a unique microporous-mesoporous composite channel structure, ultra-high specific surface area and Ni/Co bimetallic synergistic effect, so it has excellent supercapacitor performance. It exhibits a specific capacity of 1652Fg-1 at a current density of 1Ag-1. At the same time, the organic ligand anions freed into the solution can be recovered through acidification treatment and used for recycling production, reducing pollution and production costs. This mild, controllable, and economical synthesis strategy can also be extended to other bimetallic systems to provide guidance for the electrochemical applications of functional MOFs derivatives. Reviewers spoke highly of this scientific research achievement and believed that the alkaline hydrolysis strategy selected for this achievement can effectively maintain the original morphology and porosity of MOFs. The reaction process is very simple and organic ligands can be recovered, which has important scientific research implications. and practical significance. This scientific research result can promote the application research of MOFs and its derivative materials in the energy field. ACSNano is an authoritative international journal sponsored by the American Chemical Society. It has a strong influence in the fields of chemistry, materials and energy and has extremely strict requirements on the cutting-edge research content. The latest impact factor is 13.709. Sun Daofeng's team has carried out research on the construction and performance of cluster-based MOFs in recent years. Relevant research papers have been published in Angew.Chem.Int.Ed.2018,57,5095, J.Am.Chem.Soc.2018,140,10814, J.Mater.Chem.A2018,6,24486, Chem.Eur. J.2018,24,2137, Inorg.Chem.Front.2018,5,2445, J.Am.Chem.Soc.2019,141,17,6967-6975 and other publications.

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