The　nanomorphology　of　ZIFs　strongly　influences　or　even　improves　chemical　properties　of　the　metal-organic　materials.　Nanosized　rhombic　dodecahedral　ZIF-67　crystals　were　successfully　synthesized　through　a　simple　co-precipitation　method　at　room　temperature,　and　fully　characterized　by　XRD,　FT-IR,　DRS,　XPS,　TEM,　SEM,　TGA　and　N2/CO2　sorption　measurements.　The　as-prepared　ZIF-67　material　was　applied　to　be　an　efficient　heterogeneous　co-catalyst　for　the　photocatalytic　CO2　reduction　by　cooperating　with　a　ruthenium-based　dye　as　a　photosensitizer　under　mild　reaction　conditions.　Under　the　optimal　reaction　conditions,　the　photocatalytic　CO2　reduction　system　achieved　a　superior　catalytic　performance　with　a　CO　generation　rate　of　37.4 μmol/30 min,　which　was　much　higher　than　that　of　other　types　of　MOFs.　The　carbon　source　of　the　evaluated　CO　was　confirmed　by　13CO2　isotopic　experiment.　The　stability　and　reusability　of　the　ZIF-67　co-catalyst　in　the　reaction　system　were　also　examined.　The　present　work　provides　new　insights　in　the　developments　of　nanoscale　ZIFs　materials　for　photocatalytic　application.　©　2017　Elsevier　B.V.