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- W2735855331 abstract "Currently Pt/Ni alloy [1] and de-alloyed [2] Pt/Ni nanoparticles, and the 3M nanostructured thin film catalyst of de-alloyed Pt/Ni films on whiskers [3] are some of the few to have met the DoE 2020 mass activity target of 0.44 A/mg Pt at 0.9 VIR free. The origin of the extraordinary activity shown by the Ni/Pt system is attributed to a delicate balance between a thin Pt shell and the sub-surface Ni content [1]. One approach to the preparation of highly active Ni/Pt electrocatalysts is by galvanic displacement of Ni from nanofibres with platinum [4]. We have recently found that is possible to reduce significantly the reaction time for Pt-Ni galvanic displacement by using a microwave-assisted procedure on Ni nanofibres, which leads to high mass activity catalysts (>0.5 A/mg Pt) in only 2 minutes. The shell thickness and density are controlled by extent of Ni/Pt displacement (Pt loading), itself controlled by the concentration of Pt ions in solution. By tuning the Pt content, Pt/Ni core/shell electrocatalysts were prepared that do not require electrochemical etching of surface Ni or de-alloying before utilisation. In addition the nickel core can be leached leaving chemically stable Pt4Ni thin tubular structure. References: [1] V. R. Stamenkovic, B. Fowler, B. S. Mun, G. Wang, P. N. Ross, C. A. Lucas and N. M. Markovic, Science 315 493–497 (2007). [2] P. Strasser and S. Kuhl, Nano Energy 26 1–12 (2016). [3] M. K. Debe, R. T. Atanasoski and A. J. Steinbach, ECS Trans. 41 937–954 (2011). [4] S. M. Alia, Y. S. Yan and B. S. Pivovar, Catal. Sci. Technol. 4 3589–3600 (2014). Acknowledgement: This project has received funding from the Fuel Cells and Hydrogen 2 Joint Undertaking under grant agreement No 700127 INSPIRE. This Joint Undertaking receives support from the European Union's Horizon 2020 research and innovation programme." @default.
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- W2735855331 date "2017-01-01" @default.
- W2735855331 modified "2023-09-25" @default.
- W2735855331 title "A Core-Shell Fibrillar Electrocatalyst for the PEMFC Cathode By Microwave Accelerated Galvanic Displacement of Nickel with Platinum" @default.
- W2735855331 doi "https://doi.org/10.1149/ma2017-02/35/1526" @default.
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