Composites of metal-organic frameworks (MOFs) and LDHs for energy storage and environmental applications: Fundamentals, progress, and perspectives

The increasing demand for energy has caused irreversible pollution to the environment. In order to protect the ecological balance, people are constantly exploring materials with excellent energy storage and environmental protection performance. Composites of Metal Organic Frameworks (MOFs) and layered double hydroxides (LDHs) synthesized by MOFs and LDHs has rich electroactive sites, porous structure, high surface area and interactive conductive network, which overcomes the shortcomings of poor conductivity, low electron transmission efficiency and self-accumulation when MOFs and LDHs exist alone, and has attracted the attention of energy storage and environmental protection, and has become a hot material explored by researchers in recent years. In this paper, the applications of the composites of LDHs and MOFs in electrochemical energy storage (EES) and environmental protection in recent years are reviewed. Firstly, the basic characteristics and synthesis route of composite materials are briefly summarized. Secondly, the surface engineering such as heteroatom doping, holes and heterojunction, and the construction of hollow structure and core-shell structure are emphatically introduced. Thirdly, it summarizes its application in energy storage and environmental protection. Finally, the development prospect of composite materials combining LDHs and MOFs is prospected. This review lays a foundation for the development of composite materials of MOFs and LDHs.