Ordered Intermetallic Pd3Bi Prepared by an Electrochemically Induced Phase Transformation for Oxygen Reduction Electrocatalysis
| Autor: | Kenneth J. T. Livi, Chenyang Li, Bernard Gaskey, Du Sun, Zhuo-Qun Zhang, fufei an, Anthony Shoji Hall, Yunfei Wang, Tim Mueller, Ruichun Luo, hamdan alghamdi, Chuhong Wang |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
General Engineering Intermetallic General Physics and Astronomy Nanochemistry Nanoparticle 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry Electrocatalyst 01 natural sciences 0104 chemical sciences Catalysis Chemical engineering Vacancy defect Phase (matter) General Materials Science 0210 nano-technology |
| Zdroj: | ACS Nano. 13:10818-10825 |
| ISSN: | 1936-086X 1936-0851 |
| DOI: | 10.1021/acsnano.9b06019 |
| Popis: | The synthesis of alloys with long-range atomic-scale ordering (ordered intermetallics) is an emerging field of nanochemistry. Ordered intermetallic nanoparticles are useful for a wide variety of applications such as catalysis, superconductors, and magnetic devices. However, the preparation of nanostructured ordered intermetallics is challenging in comparison to disordered alloys, hindering progress in material development. Herein, we report a process for converting colloidally synthesized ordered intermetallic PdBi2 to ordered intermetallic Pd3Bi nanoparticles under ambient conditions by electrochemical dealloying. The low melting point of PdBi2 corresponds to low vacancy formation energies, which enables the facile removal of the Bi from the surface while simultaneously enabling interdiffusion of the constituent atoms via a vacancy diffusion mechanism under ambient conditions. The resulting phase-converted ordered intermetallic Pd3Bi exhibits 11 times and 3.5 times higher mass activity and high methanol tolerance for the oxygen reduction reaction compared with Pt/C and Pd/C, respectively, which is the highest reported for a Pd-based catalyst, to the best of our knowledge. These results establish a key development in the synthesis of noble-metal-rich ordered intermetallic phases with high catalytic activity and set forth guidelines for the design of ordered intermetallic compounds under ambient conditions. |
| Databáze: | OpenAIRE |
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