Effective ionic-liquid microemulsion based electrodeposition of mesoporous Co-Pt films for methanol oxidation catalysis in alkaline media

• Published in: Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2016-01, Vol.4 (2), p.785-7814
• Main Authors: Serrà, Albert, Gómez, Elvira, Golosovsky, Igor V, Nogués, Josep, Vallés, Elisa
• Format: Article
• Language: English
• Subjects: Alloys; Alternative energy sources; Catalitzadors; Catalysis; Catalysts; Làmines primes (Geologia); Media; Metanol; Methanol; Methyl alcohol; Microemulsions; Morphology; Thin sections (Geology)
• ISSN: 2050-7488; 2050-7496
• DOI: 10.1039/c6ta02035f

Pt-based direct methanol fuel cells are attracting increasing interest as environmentally friendly alternative energy sources. However, the high price of Pt and the difficulty to prepare favourable morphologies for catalysis ( e.g. , mesoporous materials) are hampering their development into feasible products. Here, we demonstrate a novel approach to efficiently grow mesoporous films of Pt-poor alloys (Co 3 Pt and CoPt 3 ), based on electrodeposition in ionic liquid-in-water (IL/W) microemulsions. The high proportion of the electrolytic aqueous solution in the IL/W microemulsion favors a significant deposition rate, while the presence of IL drops induces the formation of highly mesoporous films. The mesoporous alloys, with pores in the 8-11 nm range, exhibit excellent durability in acidic and alkaline aggressive media, maintaining their peculiar morphology. The structures are very efficient for the catalysis of methanol electro-oxidation in alkaline media, with minimal poisoning of the catalysts. These results pave the way to develop simple, versatile environmentally friendly fuel cell catalysts to commercialize new viable ecological alternative energy sources. Electrodeposited mesoporous CoPt alloys are demonstrated as excellent methanol oxidation catalysts in alkaline media.