This section will introduce the research progress of polymers in energy conversion and storage, focusing on the design and synthesis of covalent organic frameworks and their application in photocatalytic hydrogen evolution and photothermal conversion in solar energy conversion. In electrocatalysis, the synthesis, characteristics, in situ characterization techniques of electrocatalyst materials with local microstructure active zone and applicable electrocatalytic reactions were introduced. In the application of energy storage, the large-scale preparation technology of graphene is introduced, including the aqueous phase stripping of ultra-high concentration graphene, the construction of three-dimensional graphene structure, and the macro preparation of high-quality graphene and ultra-large graphene oxide.