Synergistic Photothermal‐Photocatalytic Accordion‐Like Mo2AlB2 MBene Membrane for High‐Efficiency Solar‐Powered Water Remediation

Abstract Addressing the global freshwater crisis demands advanced solutions where solar‐driven interfacial evaporation (SDIE) shows promise, yet integrated photothermal‐photocatalytic synergy within a single platform remains fundamentally challenging. An accordion‐like Mo 2 AlB 2 MBene is pioneered and engineered into a crosslinked MBene/Polyvinylachohol (PVA)/meso‐tetra (4‐carboxyphenyl) porphyrin (TCPP) composite membrane (MPTM) that synergistically unifies solar harvesting and catalytic degradation. This architecture leverages accordion‐like MBene nanosheets and interfacial porphyrin coordination to establish a dynamic hydrophilic network with exceptional broadband absorption (93.3% average, 200–2500 nm). Through Schottky junction formation and charge redistribution, the system achieves unprecedented solar evaporation rates (2.24 kg m − 2 h −1 under 1 sun) while concurrently generating reactive oxygen species (•OH/•O 2 − ) that degrade 98.7% organic pollutants (10 ppm rhodamine B) in 2 h. The MPTM sustains > 85% evaporation efficiency during long‐term stability operation (Bohai seawater, 200 h) with < 4% efficiency decay, establishing a new paradigm for solar‐powered water purification.