Constructing　strong　interfacial　electric　fields　to　enhance　the　surface　charge　transport　kinetics　is　an　effective　strategy　for　promoting　CO2　conversion.　Herein,　we　present　the　fabrication　of　CdS-Bi2MoO6　Z-scheme　heterojunctions　with　a　robust　internal　electric　field　(IEF)　using　an　in　situ　growth　technique,　establishing　chemical　bonding　between　the　components.　The　IEF　at　the　interface　can　offer　an　impetus　for　the　segregation　and　transportation　of　photogenerated　carriers,　while　the　Cd-O　chemical　bonding　mode　acts　as　a　rapid　conduit　for　these　carriers,　thereby　reducing　the　charge　transfer　distance.　As　a　result,　the　Z-scheme　charge　transfer　is　accelerated　due　to　the　synergistic　influence　of　these　two　factors.　Therefore,　the　optimized　CdS/Bi2MoO6　Z-scheme　heterojunction　possesses　significantly　enhanced　dynamic　carrier　mobility,　thus　promoting　the　conversion　of　CO2　to　CO　without　the　need　for　additional　co-catalysts　or　sacrificial　agents.　This　optimization　yields　a　remarkable　CO　selectivity　of　up　to　97%.　Meanwhile,　the　expedited　Z-scheme　charge　transfer　mechanism　is　validated　through　Xray　photoelectron　spectroscopy,　Kelvin　probe　force　microscopy,　and　in　situ　diffuse　reflectance　infrared　Fourier　transform　spectroscopy.