Pt-Ag nanostructured 3D architectures: A tunable catalyst for methanol oxidation reaction
| Autor: | Neelakandapillai Sandhyarani, Thulasi Radhakrishnan |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Polyvinylpyrrolidone Reducing agent Formic acid General Chemical Engineering Nanoparticle chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Catalysis Nanomaterials chemistry.chemical_compound chemistry Chemical engineering Electrochemistry medicine Methanol 0210 nano-technology Platinum medicine.drug |
| Zdroj: | Electrochimica Acta. 298:835-843 |
| ISSN: | 0013-4686 |
| DOI: | 10.1016/j.electacta.2018.12.151 |
| Popis: | Platinum-noble metal binary nanoparticles with high surface energy and controlled size exposing high index planes represent an emerging class of nanomaterials for electro-catalytic applications. However, difficulty in the synthesis of a stable high index plane exposed nanoparticles pose a hurdle to their practical applications. Herein, we report a two-step method for the synthesis of large platinum-silver nanostructures with exposed high index facets formed by the self-assembly of small nanoparticles. In the first step, size and shape controlled platinum-silver nanoparticles are synthesized using formic acid as the reducing agent and polyvinylpyrrolidone as the surfactant. In the second step, square wave potential was applied which leads to preferential exposure of high index facets on these individual platinum-silver nanoparticles. The catalyst exhibits high electro-catalytic activity towards methanol oxidation reaction with a specific activity ∼18 times higher than that of commercial platinum/carbon and 9 times higher than commercial platinum-ruthenium/carbon catalysts. This catalyst also proves to be efficient for ethanol and formic acid electro-oxidation, which shows the potential of this catalyst in practical fuel cell applications. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect