High Specific and Mass Activity for the Oxygen Reduction Reaction for Thin Film Catalysts of Sputtered Pt3Y
Artikel i vetenskaplig tidskrift, 2017

Fuel cells have the potential to play an important role in sustainable energy systems, provided that catalysts with higher activity and stability are developed. In this work, it is found that thin alloy films of single-target cosputtered platinum-yttrium exhibit up to seven times higher specific activity (13.4 +/- 0.4 mA cm(-2)) for the oxygen reduction reaction (ORR) than poly-crystalline platinum, and up to one order of magnitude higher mass activity (3.5 +/- 0.3 A mg(-1)) than platinum nanoparticles. These alloys have the highest reported ORR activity for an as-deposited material, i.e., without any additional chemical or thermal treatment. The films show an improvement in stability over the same materials in nanoparticulate form. Physical characterization shows that the thin films form a platinum overlayer supported on an underlying alloy. The high activity is likely related to compressive strain in that overlayer. As sputtering can be used to mass-produce fuel cell electrodes, the results open new possibilities for the preparation of platinum-rare earth metal alloy catalysts in commercial devices.

platinum

thin films

catalysis

fuel cells

alloys

Författare

Niklas Lindahl

Chalmers, Fysik, Kondenserade materiens fysik

E. Zamburlini

Danmarks Tekniske Universitet (DTU)

Ligang Feng

Chalmers, Fysik, Kemisk fysik

Henrik Grönbeck

Chalmers, Fysik, Kemisk fysik

M. Escudero-Escribano

Danmarks Tekniske Universitet (DTU)

Ifan E. L. Stephens

Danmarks Tekniske Universitet (DTU)

I. Chorkendorff

Danmarks Tekniske Universitet (DTU)

Christoph Langhammer

Chalmers, Fysik, Kemisk fysik

Björn Wickman

Chalmers, Fysik, Kemisk fysik

Advanced Materials Interfaces

2196-7350 (eISSN)

Vol. 4 13

Ämneskategorier

Oorganisk kemi

DOI

10.1002/admi.201700311

Mer information

Senast uppdaterat

2018-02-28