Porous fixed-bed photoreactor for boosting C-C coupling in photocatalytic CO_(2)reduction  

作　　者：Shengjie Bai Haoran Qiu Mengmeng Song Guiwei He Feng Wang Liejin Guo 

机构地区：[1]International Research Center for Renewable Energy,State Key Laboratory of Multiphase Flow in Power Engineering,Xi'an Jiaotong University,Xi'an,Shaanxi,710049,China

出　　处：《eScience》2022年第4期428-437,共10页电化学与能源科学（英文）

基　　金：S.J.Bai,H.R.Qiu,and M.M.Song contributed equally to this work.This work is supported by the Basic Science Center Program for Ordered Energy Conversion of the National Natural Science Foundation of China(No.51888103).We also thank C.Liao for drawing some pictures for this article.In addition,we thank Doc.N.Deng and Miss D.He at the Instrumental Analysis Center of Xi'an Jiaotong University for their assistance with GC-MS and TRPL measurement.

摘　　要：Solar-driven CO_(2)conversion to chemical fuels in an aqueous solution is restricted not only by photocatalysts but also by mass transfer.Here,a regulatable three-phase interface on a porous fixed-bed is constructed for efficient C-C coupling in photocatalytic CO_(2)reduction.The photocatalytic results show that∼90%selectivity towards C^(2+)products is obtained by a Cu/Cd_(0.5)Zn_(0.5)S photocatalyst,with a yield of 6.54μmol/h(an irradiation area of 0.785 cm^(2)),while only 0.94μmol/h(an irradiation area of 19.625 cm^(2))is achieved with a commonly used suspension photocatalytic reactor.We find that under the same CO_(2)feed rate,the local CO_(2)concentration in this porous fixed-bed photoreactor is obviously higher than in the suspension photoreactor.The larger local CO_(2)coverage derived from a higher CO_(2)supply and aggregation enhances the C-C coupling,thereby generating more C^(2+).Even an observable three-phase interface on the porous fixed-bed can be regulated by adjusting the CO_(2)supply,for which the optimal gas inlet rate is 5-10 sccm.

关 键 词：Photocatalytic CO_(2)reduction Cu/Cd_(0.5)Zn_(0.5)S Porous fixed-bed Three-phase interface C^(2+)chemical fuel 

分 类 号：O64[理学—物理化学]