25 May '15, 10am

Pt-Cr alloy outperforms #platinum as #fuelcell catalyst

Search for highly active and corrosion-resistant low-cost catalyst represents a huge challenge for fuel cell development and large-scale commercialization. Platinum is still considered as the state-of-art for cathode catalyst material in polymer electrolyte membrane fuel cells (PEMFC). However, it exhibits a slow kinetics for oxygen reduction reaction (ORR) that is mostly due to the strong bonding energy of the oxygen molecules (494 kJ mol−1 ) on Pt sites as well as the presence of adsorbents. The poor long-term stability of the Pt nanoparticles, Pt scarcity and the exorbitant price of raw material (1500$/oz) are also crucial issues as well. For these reasons, reduction of Pt loading by alloying Pt with a less expensive and abundantly available transition element appears to be an attractive approach whereas corrosion of non-precious metal is still a controversial concern t...

Full article: http://www.greencarcongress.com/2015/05/20150525-ptcr.html

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