采用CO作为探针分子,将原位透射红外光谱应用于研究助催化剂Pt在Pt/TiO2光催化体系中的作用。实验发现,光照条件下, CO的覆盖度及样品温度没有明显变化, CO在Pt/TiO2上的吸附峰红移11 cm-1,在Pt/Al2O3上的吸附峰没有位移,表明CO在Pt/TiO2上的红移来源于TiO2上的光生电子转移到Pt上,这解释了为什么加入Pt助催化剂可提高光催化产氢活性。
In situ transmission infrared spectroscopy was used to study the role of Pt cocatalyst in Pt/TiO2 using CO as a probe molecule. An 11 cm-1 redshift of CO adsorbed on Pt/TiO2 was observed under irradiation in the absence of changes in the CO coverage or sample temperature. In contrast, no CO shift was detected on Pt/Al2O3. This indicates that the redshift of the CO adsorption peak is due to the photogenerated electron transfer from TiO2 to Pt, and this accounts for the increased photo-catalytic activity by the loaded Pt cocatalyst.
参考文献
| [1] | Hoffmann M R;Martin S T;Choi W Y;Bahnemann D W .[J].CHEMICAL REVIEWS,1995,95:69. |
| [2] | Linsebigler A L;Lu G Q;Yates J T .[J].CHEMICAL REVIEWS,1995,95:735. |
| [3] | Yang H G;Sun C H;Qiao S Z;Zou J Liu G Smith S C Cheng H M Lu G Q .[J].NATURE,2008,453:638. |
| [4] | Zhang J;Xu Q;Feng Z C;Li M J Li C .[J].ANGEWANDTE CHEMIE-INTERNATIONAL EDITION,2008,47:1766. |
| [5] | Zhang J Z .[J].Journal of Physical Chemistry B,2000,104:7239. |
| [6] | Fujihara K;Izumi S;Ohno T;Matsumura M .[J].Journal of Photochemistry and Photobiology A:Chemistry,2000,132:99. |
| [7] | Leytner S.;Hupp JT. .Evaluation of the energetics of electron trap states at the nanocrystalline titanium dioxide/aqueous solution interface via time-resolved photoacoustic spectroscopy[J].Chemical Physics Letters,2000(3-4):231-236. |
| [8] | Subramanian V;Wolf E E;Kamat P V .[J].Journal of the American Chemical Society,2004,126:4943. |
| [9] | Bazin P;Saur O;Lavalley J C;Daturi M Blanchard G .[J].Physical Chemistry Chemical Physics,2005,7:187. |
| [10] | Zhu X L;Xie Y B;Liu C J;Zhang Y P .[J].J Mater Chem A,2008,282:67. |
| [11] | Happel, M.;Myslive?ek, J.;Johánek, V.;Dvo?ák, F.;Stetsovych, O.;Lykhach, Y.;Matolín, V.;Libuda, J..Adsorption sites, metal-support interactions, and oxygen spillover identified by vibrational spectroscopy of adsorbed CO: A model study on Pt/ceria catalysts[J].Journal of Catalysis,2012:118-126. |
| [12] | Yoshida, M;Yamakata, A;Takanabe, K;Kubota, J;Osawa, M;Domen, K .ATR-SEIRAS Investigation of the Fermi Level of Pt Cocatalyst on a GaN Photocatalyst for Hydrogen Evolution under Irradiation[J].Journal of the American Chemical Society,2009(37):13218-13219. |
| [13] | Lu X W;Bandara A;Katayama M;Yamakata A Kubota J Domen K .[J].J Phys Chem C,2011,115:23902. |
| [14] | Bamwenda G R;Tsubota S;Nakamura T;Haruta M .[J].Journal of Photochemistry and Photobiology A:Chemistry,1995,89:177. |
| [15] | Mihaylov M.;Hadjiivanov K. .FTIR study of CO and NO adsorption and coadsorption on Ni-ZSM-5 and Ni/SiO2[J].Langmuir: The ACS Journal of Surfaces and Colloids,2002(11):4376-4383. |
| [16] | Stakheev A Y;Shpiro E S;Tkachenko O P;Jaeger N I Schulz Ekloff G .[J].Journal of Catalysis,1997,169:382. |
| [17] | Alexeev O S;Graham G W;Kim D W;Shelef M Gates B C .[J].Physical Chemistry Chemical Physics,1999,1:5725. |
| [18] | Ivanova E;Mihaylov M;Thibault-Starzyk F;Daturi M Hadjiivanov K .[J].J Mater Chem A,2007,274:179. |
| [19] | An N H;Li S Y;Duchesne P N;Wu P Zhang W L Lee J F Cheng S Zhang P Jia M J Zhang W X .[J].J Phys Chem C,2013,117:21254. |
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