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Direct photocatalytic hydrogen and oxygen evolution from water splitting is an attractive approach for producing chemical fuels. In this work, a novel fluorenone‐based covalent organic framework (COF‐SCAU‐2) is successfully exfoliated into ultrathin three‐layer nanosheets (UCOF‐SCAU‐2) for photocatalytic overall water splitting (OWS) under visible light. The ultrathin structures of UCOF‐SCAU‐2 greatly...
Covalent organic frameworks (COFs) have shown great promise for photocatalytic hydrogen evolution via water splitting. However, the four‐electron oxidation of water remains elusive toward oxygen evolution. Enabling this water oxidation pathway is critical to improve the yield and maximize atom utilization efficiency. A Z‐scheme heterojunction is proposed for overcoming fundamental issues in COF‐based...
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