Nanostructure rod-like TiO2-reduced graphene oxide composite aerogels for highly-efficient visible-light photocatalytic CO2 reduction

•Nanostructure TiO2-reduced graphene oxide composite aerogels (rGO-TA) were synthesized.•The rod-like TiO2 with a width of 10–20 nm and length of 100–150 nm are decorated on the network structure of rGO aerogel.•In-situ rGO-TA composite exhibited highest visible light absorption.•Anchoring of oxygen vacancies and C-O-Ti bond contribute to the enhanced activity.•The highest carbon conversion of composite aerogel was 15.7 times than that of P25.