Due to its unique layered network structure and good light absorption in the visible range,low-cost graphitic carbon nitride(C_(3)N_(4))is widely used in the field of photocatalytic hydrogen evolution.However,its perf...Due to its unique layered network structure and good light absorption in the visible range,low-cost graphitic carbon nitride(C_(3)N_(4))is widely used in the field of photocatalytic hydrogen evolution.However,its performance is limited by photogenerated carrier recombination and other issues.To solve these problems,the photogenerated carriers of C_(3)N_(4) are transferred and separated in space by the fully conjugated structure of the fullyπ-conjugated 3D covalent organic framework(BUCT-COF).In addition,the S-scheme heterojunction formed between BUCT-COF and C_(3)N_(4) promotes the separation and transport of photogenerated charge carriers within the molecular framework and at the interface and maintains the maximum redox capacity of spatial separation of electrons and holes.Under the synergistic effect of these two substances,the utilization rate of photogenerated charge carriers in g-C_(3)N_(4) is significantly enhanced,and the constructed composite catalyst exhibits excellent hydrogen evolution activity.The electron migration path of S-scheme heterojunction is proved by in situ XPS.展开更多
基金supported by the Natural Science Foundation of the Ningxia Hui Autonomous Region(No.2023AAC02046).
文摘Due to its unique layered network structure and good light absorption in the visible range,low-cost graphitic carbon nitride(C_(3)N_(4))is widely used in the field of photocatalytic hydrogen evolution.However,its performance is limited by photogenerated carrier recombination and other issues.To solve these problems,the photogenerated carriers of C_(3)N_(4) are transferred and separated in space by the fully conjugated structure of the fullyπ-conjugated 3D covalent organic framework(BUCT-COF).In addition,the S-scheme heterojunction formed between BUCT-COF and C_(3)N_(4) promotes the separation and transport of photogenerated charge carriers within the molecular framework and at the interface and maintains the maximum redox capacity of spatial separation of electrons and holes.Under the synergistic effect of these two substances,the utilization rate of photogenerated charge carriers in g-C_(3)N_(4) is significantly enhanced,and the constructed composite catalyst exhibits excellent hydrogen evolution activity.The electron migration path of S-scheme heterojunction is proved by in situ XPS.
