The　combination　of　cobalt　redox　catalysis　and　carbon　nitride　photocatalysis　to　construct　a　cascade　photoreaction　system　has　been　developed　for　the　deoxygenative　reduction　of　CO2　to　CO　with　visible　light.　The　graphitic　carbon　nitride　has　been　demonstrated　to　function　both　as　a　capture/activation　substrate　of　CO2　and　a　photocatalyst,　whereas　the　introduced　cobalt　species　act　as　reductive　and　oxidative　promoters　to　accelerate　charge-carrier　separation　and　transfer　kinetics.　This　hybrid　photosystem　contains　inexpensive　substances　that　synergetically　catalyze　CO　2-to-CO　conversion　at　mild　conditions,　with　a　high　stability　of　catalysts.　The　optimization　in　the　surface　and　texture　structures　as　well　as　reaction　conditions　has　been　demonstrated.　The　results　represent　an　important　step　toward　artificial　photosynthesis　by　using　cost-acceptable　materials.　©　2013　American　Chemical　Society.