Platinum - Coated Cobalt Nanowires as Oxygen Reduction Reaction Electrocatalysts

Journal Article · Wed Jan 01 00:00:00 EST 2014 · ACS Catalysis

DOI:https://doi.org/10.1021/cs500370q· OSTI ID:1159472

Alia, Shaun M ^[1]; Pylypenko, Svitlana ^[2]; Neyerlin, Kenneth C ^[1]; Cullen, David A ^[2]; Kocha, Shyam S ^[1]; Pivovar, Bryan ^[3]

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1. National Renewable Energy Laboratory (NREL)
2. ORNL
3. Los Alamos National Laboratory (LANL)

Cobalt nanowires (CoNWs) are coated with platinum (Pt) by partial galvanic displacement, forming core/shell wires 200 300 nm in diameter and 100 200 1m in length. PtCoNWs are characterized for activit y in the oxygen reduction reaction (ORR) with rotating disk electrode half5cells in 0.1 M perchloric acid electrolytes. The resulting catalysts demonstrate ORR specific activi ties in the range 2053 2783 1A cm Pt 2 , comparable to the specific activity of polycrystalline Pt. The specific activi ties of PtCoNWs increase with decreasing Pt content and exhibit a corresponding increase in Pt lattice compression. P tCoNWs have exhibited a maximum mass activity of 79 3 mA mg Pt 1 , 2.6 times greater than carbon5supported Pt nanopart icles.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1159472
• Journal Information: ACS Catalysis, Vol. 4, Issue 00; ISSN 2155--5435
• Country of Publication: United States
• Language: English