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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 (CoPt and CoPt), 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.This work was supported by the EU ERDF (FEDER) fund and the Spanish Government grant TEC2014-51940-C2-2-R from Ministerio de Economía y Competitividad (MINECO). The partial support from the 2014-SGR-1015 project from the Generalitat de Catalunya and the Russian grants RFBR 16-02-00058 and RG14.B25.31.0025 is also acknowledged. A. S. thanks the Ministerio de Educación, Cultura y Deporte for a predoctoral grant (FPU). The authors thank the CCiT-UB for the use of their equipment. ICN2 acknowledges support from the Severo Ochoa Program (MINECO, Grant SEV-2013-0295).Peer Reviewe

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