Floatable Artificial Leaf to Couple Oxygen-Tolerant CO2 Conversion with Water-Purification

To enable open-environment application of artificial photosynthesis, the direct utilization of environmental CO ₂ via an oxygen-tolerant reductive procedure is necessary. Herein, we introduce an in-situ growth strategy for fabricating two-dimensional heterojunctions between indium porphyrin metal-organic framework (In-MOF) and single-layer graphene oxide (GO). Upon illumination, the In-MOF/GO heterostructure facilitates a tandem CO ₂ capture and photocatalytic reduction on its hydroxylated In-node, prioritizing the reduction of dilute CO ₂ even in the presence of air-level O ₂ . The In-MOF/GO heterostructure photocatalyst was integrated with a porous polytetrafluoroethylene (PTFE) membrane to construct a floatable artificial leaf. Through a triphase photocatalytic reaction, the floatable artificial leaf can remove aqueous contaminants from real water while efficiently reducing CO ₂ at low concentrations (10%, approximately the CO ₂ concentration in combustion flue gases) upon air-level O ₂ . This study provides a scalable approach for the construction of photocatalytic devices for CO ₂ conversion in open environments.