Engineering interfacial frustrated Lewis pairs on PTI-BPDI for selective CO2 photoreduction to CH4.

A PTI-BPDI photocatalyst is synthesized and shows improved selectivity for CO2-to-CH4 conversion. The interfacial frustrated Lewis pairs (FLPs) serve as active sites that simultaneously promote CO2 adsorption and activation while stabilizing the *CO intermediate. This dual role effectively shifts the thermodynamic preference from CO desorption toward subsequent hydrogenation, enabling selective CH4 formation.