Oxygen heteroatom-induced localized dipole polarization enabling charge separation for efficient photocatalytic H 2 O 2 production

production. PXZ-COF demonstrated superior catalytic performance, attributed to a unique dipole polarization enhancement mechanism arising from high electronegativity of the oxygen heteroatom combined with an optimal π-conjugated system. This work presents a novel microenvironment engineering strategy for advanced COF photocatalysts.