文献类型：期刊文献

英文题名：Engineering Built-In Electric Field Microenvironment of CQDs/g-C3N4 Heterojunction for Efficient Photocatalytic CO2 Reduction

作者：Xu, Yun[1];Hou, Weidong[1];Huang, Kai[2,3];Guo, Huazhang[1];Wang, Zeming[1];Lian, Cheng[2,3];Zhang, Jiye[4];Wu, Deli[5];Lei, Zhendong[5,6];Liu, Zheng[6];Wang, Liang[1]

机构：[1]Shanghai Univ, Inst Nanochem & Nanobiol, Sch Environm & Chem Engn, Shanghai 200444, Peoples R China;[2]East China Univ Sci & Technol, Shanghai Engn Res Ctr Hierarch Nanomat, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[4]Shanghai Univ, Sch Mat Sci & Engn, 99 Shangda Rd, Shanghai 200444, Peoples R China;[5]Tongji Univ, Coll Design & Innovat, Shanghai 200092, Peoples R China;[6]Nanyang Technol Univ, Sch Mat Sci & Engn, 50 Nanyang Ave, Singapore 639798, Singapore

年份：2024

卷号：11

期号：28

外文期刊名：ADVANCED SCIENCE

收录：;EI(收录号：20242016074772);WOS:【SCI-EXPANDED(收录号:WOS:001218071400001)】；

基金：Y.X. and W.H. contributed equally to this work. The project was funded by the National Natural Science Foundation of China (21901154) and the Shanghai Pujiang Program (21PJD022). This work was Supported by Shanghai Technical Service Center of Science and Engineering Computing, Shanghai University.

语种：英文

外文关键词：built-in electric field; carbon quantum dots; charge migration; CO2 photoreduction; heterojunction

摘要：Graphitic carbon nitride (CN), as a nonmetallic photocatalyst, has gained considerable attention for its cost-effectiveness and environmentally friendly nature in catalyzing solar-driven CO2 conversion into valuable products. However, the photocatalytic efficiency of CO2 reduction with CN remains low, accompanied by challenges in achieving desirable product selectivity. To address these limitations, a two-step hydrothermal-calcination tandem synthesis strategy is presented, introducing carbon quantum dots (CQDs) into CN and forming ultra-thin CQD/CN nanosheets. The integration of CQDs induces a distinct work function with CN, creating a robust interface electric field after the combination. This electric field facilitates the accumulation of photoelectrons in the CQDs region, providing an abundant source of reduced electrons for the photocatalytic process. Remarkably, the CQD/CN nanosheets exhibit an average CO yield of 120 mu mol g(-1), showcasing an outstanding CO selectivity of 92.8%. The discovery in the work not only presents an innovative pathway for the development of high-performance photocatalysts grounded in non-metallic CN materials employing CQDs but also opens new avenues for versatile application prospects in environmental protection and sustainable cleaning energy.