Photoreduction of CO2 using copper-decorated TiO2 nanorod films with localized surface plasmon behavior

► We propose a novel photocatalyst for the photoreduction of CO2 to CH4. ► TiO2 nanorod films and copper nanoparticles with LSPR effect. ► The plasmonic properties of copper nanoparticles enhanced the photoactivity. ► Final CH4 yield rates up to 2.91 ppm/g h.