Carbon dioxide-enhanced photosynthesis of methane and hydrogen from carbon dioxide and water over Pt-promoted polyaniline–TiO2 nanocomposites

The combination of polyaniline with TiO2 significantly enhanced the photocatalytic reduction of CO2 with H2O owing to the increased CO2 chemisorption and the facilitated separation of photogenerated electron-hole pairs. We discovered that CO2 played a unique role in enhancing the electron-hole separation and the photocatalytic activity for polyaniline-containing catalysts.