Realizing a CO-free pathway and enhanced durability in highly dispersed Cu-doped PtBi nanoalloys towards methanol full electrooxidation
| Autor: | Xiaotong Yang, Fengling Zhao, Zhi-You Zhou, Jin-Yu Ye, Qiang Yuan |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Kinetics 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Electrocatalyst 01 natural sciences 0104 chemical sciences Anode chemistry.chemical_compound Nanocrystal Chemical engineering chemistry General Materials Science Methanol Fourier transform infrared spectroscopy 0210 nano-technology Spectroscopy Methanol fuel |
| Zdroj: | Journal of Materials Chemistry A. 8:11564-11572 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/d0ta03330h |
| Popis: | Pt is the most active anode electrocatalyst for the oxidation of methanol in direct methanol fuel cells (DMFCs); however, its weak resistance to CO or CO-like species poisoning has been a matter of great concern. Therefore, the development of a highly durable anode Pt-based electrocatalyst is indispensable for large-scale application of DMFCs. Here, we demonstrate that a CO-free pathway, 6-electron full electrooxidation of methanol, is realized in highly dispersed Cu-doped PtBi alloy-phase nanocrystals by combining nuclear magnetic resonance (NMR) spectroscopy and in situ Fourier transform infrared (FTIR) spectroscopy analysis. A mass activity (MA) of 5.25 A mgPt−1 and durability for 30 hours without current decay are obtained for the PtBiCu nanoalloys. The abundant surface defects, downshift of the Pt d-band center and the dual active site of “Pt–Bi” and “Pt–Cu” endow the PtBiCu nanoalloys with faster methanol oxidation kinetics, thus enhancing activity and durability. This work provides a new strategy to synthesize alloy-phase PtBiCu nanocrystals by crystal phase transition as a highly efficient and durable anode electrocatalyst for DMFCs. |
| Databáze: | OpenAIRE |
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