Exceptional Oxygen Reduction Reaction Activity and Durability of Platinum-Nickel Nanowires Through Synthesis and Post-Treatment Optimization

Shaun Alia, Mai-Anh Ha, Kenneth Neyerlin, Bryan Pivovar, Svitlana Pylypenko, Chilan Ngo, Sarah Shulda, Johanna Weker, Arrelaine Dameron, Shyam Kocha

Research output: Contribution to journalArticlepeer-review

49 Scopus Citations

Abstract

For the first time, extended nanostructured catalysts are demonstrated with both high specific activity (>6000 μA cmPt-2 at 0.9 V) and high surface areas (>90 m2 gPt-1). Platinum-nickel (Pt - Ni) nanowires, synthesized by galvanic displacement, have previously produced surface areas in excess of 90 m2 gPt-1, a significant breakthrough in and of itself for extended surface catalysts. Unfortunately, these materials were limited in terms of their specific activity and durability upon exposure to relevant electrochemical test conditions. Through a series of optimized postsynthesis steps, significant improvements were made to the activity (3-fold increase in specific activity), durability (21% mass activity loss reduced to 3%), and Ni leaching (reduced from 7 to 0.3%) of the Pt - Ni nanowires. These materials show more than a 10-fold improvement in mass activity compared to that of traditional carbon-supported Pt nanoparticle catalysts and offer significant promise as a new class of electrocatalysts in fuel cell applications.

Original languageAmerican English
Pages (from-to)1408-1418
Number of pages11
JournalACS Omega
Volume2
Issue number4
DOIs
StatePublished - 30 Apr 2017

Bibliographical note

Publisher Copyright:
© 2017 American Chemical Society.

NREL Publication Number

  • NREL/JA-5900-68143

Keywords

  • catalysts
  • electrochemistry
  • fuel cells
  • heat treatment
  • nanostructures
  • nanowires
  • oxygen reduction
  • platinum
  • redox reaction
  • thermal properties

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