Covalent organic framework(COF)materials have gained significant applications in electrocatalytic systems due to their structural diversity and tunable functionalities.Moreover,three-dimensional(3D)COFs exhibit multis...Covalent organic framework(COF)materials have gained significant applications in electrocatalytic systems due to their structural diversity and tunable functionalities.Moreover,three-dimensional(3D)COFs exhibit multistage pore structures,exposing numerous open sites,which facilitate the oxygen reduction reaction(ORR)process.However,the advancement of 3D COFs for ORR has been hindered by challenges,including limited topologies,the scarcity of building blocks with the required reactivity and symmetries,and difficulties in determining crystalline structures.In this work,we utilized an 8-connectivity building unit and successfully constructed two isoreticular 3D COF materials,which exhibited exceptionally high catalytic activity for 2e−oxygen reduction reaction without the addition of any metal or conductive support materials,nor the pyrolyzed process.The electrochemically active surface areas(ECSAs)of the two 3D COFs were found to be 17.19 and 12.18 mF/cm2,respectively,which were significantly higher than those reported from other framework materials.展开更多
基金supported by the National Natural Science Foundation of China(22271106,22105202,22275185)China Postdoctoral Science Foundation(2021M693178,2022T150650)+3 种基金XIREM Autonomously Deployment Project(2023GG01)Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China(2021ZZ115)Strategic Priority Research Program of the Chinese Academy of Sciences(XDB20000000)State Key Laboratory of Structural Chemistry,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences(20230027)。
文摘Covalent organic framework(COF)materials have gained significant applications in electrocatalytic systems due to their structural diversity and tunable functionalities.Moreover,three-dimensional(3D)COFs exhibit multistage pore structures,exposing numerous open sites,which facilitate the oxygen reduction reaction(ORR)process.However,the advancement of 3D COFs for ORR has been hindered by challenges,including limited topologies,the scarcity of building blocks with the required reactivity and symmetries,and difficulties in determining crystalline structures.In this work,we utilized an 8-connectivity building unit and successfully constructed two isoreticular 3D COF materials,which exhibited exceptionally high catalytic activity for 2e−oxygen reduction reaction without the addition of any metal or conductive support materials,nor the pyrolyzed process.The electrochemically active surface areas(ECSAs)of the two 3D COFs were found to be 17.19 and 12.18 mF/cm2,respectively,which were significantly higher than those reported from other framework materials.
