New Model for a Pd-Doped SnO2-Based CO Gas Sensor and Catalyst Studied by Online in-Situ X-ray Photoelectron Spectroscopy

摘要: The functional mechanism of oxide-based gas sensors and the catalysis reaction are controversial topics. traditional static photoelectron data collection technique is obviously not satisfied for this study. However, after appropriate remodification system we propose a new, online XPS in-situ overcoming difficulty. This was employed first time on kind study with SnO2-based sensors. results found as follows: (1) For rutile SnO2 in powder form, its O1s peak 531.8 eV would come from lattice oxygen surface area, chemisorbed proposed conventionally; (2) observed that adsorptive process CO onto Pd-doped SnO2, Pd, CO, area could form an intermediate product [Pd(CO)4]O4, which comes unified new model illustrating sensor, one hand, oxidatio...