| 1. |
- Li, Guoqiang, et al.
(författare)
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Activity of Platinum/Carbon and Palladium/Carbon Catalysts Promoted by Ni2P in Direct Ethanol Fuel Cells
- 2014
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Ingår i: ChemSusChem. - : Wiley. - 1864-5631 .- 1864-564X. ; 7:12, s. 3374-3381
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Tidskriftsartikel (refereegranskat)abstract
- Ethanol is an alternative fuel for direct alcohol fuel cells, inwhich the electrode materials are commonly based on Pt orPd. Owing to the excellent promotion effect of Ni2P that wasfound in methanol oxidation, we extended the catalyst systemof Pt or Pd modified by Ni2P in direct ethanol fuel cells. TheNi2P-promoted catalysts were compared to commercial catalystsas well as to reference catalysts promoted with only Ni oronly P. Among the studied catalysts, Pt/C and Pd/C modifiedby Ni2P (30 wt%) showed both the highest activity and stability.Upon integration into the anode of a homemade direct ethanolfuel cell, the Pt-Ni2P/C-30% catalyst showed a maximumpower density of 21 mWcm-2, which is approximately twotimes higher than that of a commercial Pt/C catalyst. The Pd-Ni2P/C-30% catalyst exhibited a maximum power density of90 mWcm-2. This is approximately 1.5 times higher than thatof a commercial Pd/C catalyst. The discharge stability on bothtwo catalysts was also greatly improved over a 12 h dischargeoperation.
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| 2. |
- Lindahl, Niklas, 1981, et al.
(författare)
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Fuel Cell Measurements with Cathode Catalysts of Sputtered Pt3Y Thin Films
- 2018
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Ingår i: ChemSusChem. - : Wiley. - 1864-5631 .- 1864-564X. ; 11:9, s. 1438-1445
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Tidskriftsartikel (refereegranskat)abstract
- Fuel cells are foreseen to have an important role in sustainable energy systems, provided that catalysts with higher activity and stability are developed. In this study, highly active sputtered thin films of platinum alloyed with yttrium (Pt 3 Y) are deposited on commercial gas diffusion layers and their performance in a proton exchange membrane fuel cell is measured. After acid pretreatment, the alloy is found to have up to 2.5 times higher specific activity than pure platinum. The performance of Pt 3 Y is much higher than that of pure Pt, even if all of the alloying element was leached out from parts of the thin metal film on the porous support. This indicates that an even higher performance is expected if the structure of the Pt 3 Y catalyst or the support could be further improved. The results show that platinum alloyed with rare earth metals can be used as highly active cathode catalyst materials, and significantly reduce the amount of platinum needed, in real fuel cells.
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