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Titanium Oxynitride Interlayer to Influence Oxygen Reduction Reaction Activity and Corrosion Stability of Pt and Pt–Ni Alloy
Author(s) -
Tan XueHai,
Wang Liya,
Zahiri Beniamin,
Kohandehghan Alireza,
Karpuzov Dimitre,
Lotfabad Elmira Memarzadeh,
Li Zhi,
Eikerling Michael H.,
Mitlin David
Publication year - 2015
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201402704
Subject(s) - platinum , materials science , catalysis , alloy , chemical engineering , corrosion , nickel , titanium , inorganic chemistry , electrochemistry , metallurgy , chemistry , electrode , biochemistry , engineering
A key advancement target for oxygen reduction reaction catalysts is to simultaneously improve both the electrochemical activity and durability. To this end, the efficacy of a new highly conductive support that comprises of a 0.5 nm titanium oxynitride film coated by atomic layer deposition onto an array of carbon nanotubes has been investigated. Support effects for pure platinum and for a platinum (50 at %)/nickel alloy have been considered. Oxynitride induces a downshift in the d‐band center for pure platinum and fundamentally changes the platinum particle size and spatial distribution. This results in major enhancements in activity and corrosion stability relative to an identically synthesized catalyst without the interlayer. Conversely, oxynitride has a minimal effect on the electronic structure and microstructure, and therefore, on the catalytic performance of platinum–nickel. Calculations based on density functional theory add insight with regard to compositional segregation that occurs at the alloy catalyst–support interface.