Local Structural Disorder Enhances the Oxygen Reduction Reaction Activity of Carbon-Supported Low Pt Loading CoPt Nanocatalysts
| Autor: | Tsan-Yao Chen, Ya-Tang Yang, Yu Jui Fan, Zi Jun Lin, Tzu Hsi Huang, Dinesh Bhalothia, Kuan Wen Wang |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Inorganic chemistry chemistry.chemical_element Nanoparticle 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Nanomaterial-based catalyst 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound General Energy chemistry Physical and Theoretical Chemistry Absorption (chemistry) 0210 nano-technology Platinum Spectroscopy Carbon Carbon monoxide |
| Zdroj: | The Journal of Physical Chemistry C. 123:19013-19021 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | A facile strategy for preparing carbon-supported Co95Pt5 nanocatalysts (NCs) with low platinum (Pt) loading and high Pt utilization via thermal reduction treatment in a carbon monoxide (CO) atmosphere is reported. By cross-referencing results of microscopy, X-ray spectroscopy, and electrochemical analysis, we demonstrate that the Pt atoms tend to form disordered atomic clusters capping on the Co nanoparticle surface. The values of unfilled d-states (hTs) extracted from X-ray absorption near-edge spectroscopy were used to calculate the d-band vacancies of Pt. Accordingly, CoPt-CO570 (reduced in CO at 570 K) possesses the lowest hTs value (0.302) (i.e., the lowest Pt d-band vacancies) among experimental samples, indicating a strong electron relocation from Co atoms. Such electron relocations are attributed to the high extent of the heteroatomic intermix between Pt and Co atoms and thus improves the oxygen reduction reaction activity of CoPt-CO570. For providing further evidence, structural and electrochemic... |
| Databáze: | OpenAIRE |
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