Effective CO_(2) adsorption and fast electron injection are two crucial processes of photocatalysts for achieving high-efficiency CO_(2) photo-reduction.However,simultaneously enhancing these processes within a single...Effective CO_(2) adsorption and fast electron injection are two crucial processes of photocatalysts for achieving high-efficiency CO_(2) photo-reduction.However,simultaneously enhancing these processes within a single photocatalyst remains a challenging task.Herein,we propose an intriguing edge effect based on the intrinsic atomic structure of g-C_(3)N_(4) nanosheets(NSs)to enhance their CO_(2) adsorption and facilitate the transfer of photo-generated electrons to the adsorbed CO_(2).By cutting large pieces of g-C_(3)N_(4) NSs into smaller fragments,the exposure of amino groups at the edges of its repeating tri-s-triazine units can be significantly increased.These edge-exposed amino groups serve as active sites for enhancing the CO_(2) capture capacity of g-C_(3)N_(4) NSs.As we decrease the lateral size of g-C_(3)N_(4) NSs from tens of micrometers to hundreds of nanometers,their CO_(2) adsorption capacity increases from 4.74 to 8.56 cm^(3) g^(-1).Reducing the size of g-C_(3)N_(4) NSs also facilitates the transfer of photo-generated electrons to the edge-adsorbed CO_(2).Thus,our optimized g-C_(3)N_(4) NSs with the edge effect exhibits a 37-fold enhancement in activity for CO_(2) photo-reduction compared to normal g-C_(3)N_(4) NSs under simulated sunlight irradiation.Notably,by introducing Pt cocatalysts,we can control product selectivity from 85.9%CO to 97.9%CH_(4).展开更多
文摘Effective CO_(2) adsorption and fast electron injection are two crucial processes of photocatalysts for achieving high-efficiency CO_(2) photo-reduction.However,simultaneously enhancing these processes within a single photocatalyst remains a challenging task.Herein,we propose an intriguing edge effect based on the intrinsic atomic structure of g-C_(3)N_(4) nanosheets(NSs)to enhance their CO_(2) adsorption and facilitate the transfer of photo-generated electrons to the adsorbed CO_(2).By cutting large pieces of g-C_(3)N_(4) NSs into smaller fragments,the exposure of amino groups at the edges of its repeating tri-s-triazine units can be significantly increased.These edge-exposed amino groups serve as active sites for enhancing the CO_(2) capture capacity of g-C_(3)N_(4) NSs.As we decrease the lateral size of g-C_(3)N_(4) NSs from tens of micrometers to hundreds of nanometers,their CO_(2) adsorption capacity increases from 4.74 to 8.56 cm^(3) g^(-1).Reducing the size of g-C_(3)N_(4) NSs also facilitates the transfer of photo-generated electrons to the edge-adsorbed CO_(2).Thus,our optimized g-C_(3)N_(4) NSs with the edge effect exhibits a 37-fold enhancement in activity for CO_(2) photo-reduction compared to normal g-C_(3)N_(4) NSs under simulated sunlight irradiation.Notably,by introducing Pt cocatalysts,we can control product selectivity from 85.9%CO to 97.9%CH_(4).
