Synergistic effects of Pd single atoms and nanoclusters boosting SnO<sub>2</sub> gas sensing performance
Oluşturanlar
- 1. SLAC Natl Accelerator Lab, SSRL, Menlo Pk, CA 94025 USA
- 2. IMEM CNR Inst, I-43124 Parma, Italy
- 3. Lawrence Berkeley Natl Lab, Natl Ctr Electron Microscopy NCEM, Berkeley, CA 94720 USA
- 4. Univ Calif Berkeley, Dept Chem & Biomol Engn, Berkeley, CA 94720 USA
- 5. TDK InvenSense Inc, San Jose, CA 95110 USA
Açıklama
Tin(iv) oxide-supported Pd is a promising heterogenous catalyst for CO oxidation relevant for environmental cleanup reactions. In this study, an atomically dispersed Pd catalyst on SnO2 (ADC Pd/SnO2) hybrid material is successfully synthesized via a straightforward wet chemistry method and is found to exhibit superior performance toward CO sensing. Ex situ EXAFS analysis confirms the formation of single Pd atoms and small Pd nanoclusters stabilized on the SnO2(110) surface. The material exhibits high efficiency in generating adsorbed O2- as well as high activity in catalyzing CO oxidation at low temperatures, resulting in exceptional sensitivity and selectivity toward CO in comparison to pure SnO2 and Pd nanoparticles loaded on SnO2 respectively. In situ FTIR measurements unravel CO adsorption kinetics on ADC Pd/SnO2 under reaction conditions, and a possible sensing mechanism is put forth in which CO is transformed into CO2 by reaction with active oxygen species; and concurrently, carbon-related species (bicarbonates and carbonates) are formed and decomposed into CO2.
Dosyalar
bib-cd4e94cb-cd97-4593-bd05-cd8ceec36c4f.txt
Dosyalar
(320 Bytes)
| Ad | Boyut | Hepisini indir |
|---|---|---|
|
md5:3ca672cd8245a969f45dd0136afdca62
|
320 Bytes | Ön İzleme İndir |