Structure and chemistry of surface-doped Pt:SnO2 gas sensing materials

被引：46
作者：
Degler, David [1 ]
Pereira de Carvalho, Hudson W. [2 ,3 ]
Kvashnina, Kristina [4 ,5 ]
Grunwaldt, Jan-Dierk [2 ]
Weimar, Udo [1 ]
Barsan, Nicolae [1 ]
机构：
[1] Univ Tubingen, Inst Phys & Theoret Chem, Morgenstelle 15, D-72076 Tubingen, Germany
[2] Karlsruhe Inst Technol, Inst Chem Technol & Polymer Chem, Engesserstr 20, D-76131 Karlsruhe, Germany
[3] Univ Sao Paulo, Ctr Energia Nucl Agr, POB 96, BR-13400970 Piracicaba, SP, Brazil
[4] ESRF, BP220,6 Rue Jules Horowitz, F-38043 Grenoble, France
[5] HZDR, Inst Resource Ecol, POB 510119, D-01314 Dresden, Germany
来源：
RSC ADVANCES | 2016年 / 6卷 / 34期
关键词：
RAY-ABSORPTION SPECTROSCOPY; TIN DIOXIDE; IN-SITU; SENSOR PERFORMANCES; CO OXIDATION; SNO2; PD; ADDITIVES; MECHANISM; NANOCRYSTALS;
D O I：
10.1039/c5ra26302f
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Surface-doped Pt:SnO2 was synthesized by impregnation of calcined SnO2 made by an aqueous sol-gel route. The structure of the introduced Pt-dopant and its behaviour during gas exposure were examined by in situ and operando X-ray absorption spectroscopy. The results reveal that Pt forms a nano-sized PtO2 phase, which was not found for bulk and surface doped materials, studied previously. In a comparative investigation of undoped and Pt-doped SnO2 gas sensors the performance and the surface chemistry were investigated, the latter one using operando FT-IR spectroscopy. The results prove the strong influence of the different Pt structures on the surface chemistry of SnO2, providing the basis for an understanding on the varying sensor performance of differently synthesized Pt:SnO2 gas sensing materials.
引用
收藏
页码：28149 / 28155
页数：7
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