Collisional Electron Transfer Route between Homogeneous Porphyrin Dye and Catalytic TiO2/Re(I) Particles for CO2 Reduction

被引:18
作者
Choi, Sunghan [1 ]
Kim, Chul Hoon [1 ]
Baeg, Jin-Ook [2 ]
Son, Ho-Jin [1 ]
Pac, Chyongjin [1 ]
Kang, Sang Ook [1 ]
机构
[1] Korea Univ, Dept Adv Mat Chem, Sejong 30019, South Korea
[2] Korea Res Inst Chem Technol, Artificial Photosynth Res Grp, Daejeon 34114, South Korea
基金
新加坡国家研究基金会;
关键词
Zn porphyrin photosensitizer; diffusion collisional electron transfer; photochemical CO2 reduction; photocatalysis; supported catalysis;
D O I
10.1021/acsaem.0c01300
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Dye detachment issue in the TiO2-mediated dye-sensitized photocatalytic system engenders an electron injection route based on collisional quenching between the detached solution-phase dye and dispersed n-type TiO2 particles, in addition to the general fast electron injection pathway from dye chemisorbed on TiO2. For porphyrin-sensitized hetero-binary hybrids prepared by mixing a solution-phase Zn porphyrin sensitizer (ZnP) and heterogeneous Re(I) molecular catalyst-immobilized TiO2 particles (TiO2/Re(I)), we found that without any dye immobilization on the TiO2 surface, the dissolved porphyrin dye can effectively transport its excited-state electrons to the heterogeneous catalytic TiO2/Re(I) particles via a collisional electron transfer pathway, which is relatively unstudied and thus an interesting topic in the dye-sensitized semiconductor photocatalytic system. The better light-harvesting ability of porphyrin in solution and the TiO2-induced stabilization of the molecular Re(I) catalyst raised the photochemical CO2-to-CO conversion activity of the semiheterogeneous system (porphyrin + TiO2/Re(I) catalyst) above that of the homogeneous system (porphyrin + Re(I) catalyst) and the heterogeneous ternary hybrid (porphyrin/TiO2/Re(I) catalyst).
引用
收藏
页码:11581 / 11596
页数:16
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