Enhanced methanol electrooxidation at Pt skin@PdPt nanocrystals
Kakade, B; Patil, I; Lokanathan, M; Swami, A
| HERO ID | 3578011 |
|---|---|
| In Press | No |
| Year | 2015 |
| Title | Enhanced methanol electrooxidation at Pt skin@PdPt nanocrystals |
| Authors | Kakade, B; Patil, I; Lokanathan, M; Swami, A |
| Volume | 3 |
| Issue | 34 |
| Page Numbers | 17771-17779 |
| Abstract | Pt skin growth over PdPt alloy nanocrystals has been described using a simple wet chemical method, where a layer-by-layer epitaxial deposition of Pt on PdPt could be understood by the Stranski-Krastanov mechanism. Initial PdPt alloy nanocrystals grown in a simple wet-chemical method, in the presence of a reducing solvent like N-methyl pyrrolidone (NMP) and a stabilizer like polyvinyl pyrrolidone (PVP), have been used as the substrate for secondary growth of a Pt thin layer. Surface changes have been observed during step-by-step growth of polyhedral Pt skin@PdPt nanocrystals originating from nearly octahedral geometries of PdPt. The methanol electrooxidation activities of two different Pt skin@PdPt nanostructures have been compared with PdPt nanocrystals with similar compositions but without skin structures and commercial RuPt catalysts. A gain factor of 8 towards electrooxidation of methanol in acidic media with activities of 1950 mA mg(Pt)(-1) and 3.1 mA cm(Pt)(-2) (with lower onset potential compared to the RuPt commercial catalyst), which is believed to be much higher compared to that of previous reports and state-of-art RuPt/C catalysts, indicating better surface properties and core-alloy formation along with improved intraparticle active interfacial sites. Additionally, exciting results of electrooxidation of ethanol and ethylene glycol with 70% and 58% activity retention respectively, after 5000 cycles are also found, demonstrating a facile C-C breaking in such C2 type alcohols. |
| Doi | 10.1039/c5ta03736k |
| Wosid | WOS:000360049900034 |
| Is Certified Translation | No |
| Dupe Override | No |
| Comments | Journal:JOURNAL OF MATERIALS CHEMISTRY A 2050-7488 |
| Is Public | Yes |