Optimization of sulfur-doped graphene as an emerging platinum nanowires support for oxygen reduction reaction

Md Ariful Hoque, Fathy M. Hassan, Min Ho Seo, Ja Yeon Choi, Mark Pritzker, Shanna Knights, Siyu Ye, Zhongwei Chen

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)

Abstract

The slow kinetics of the oxygen reduction reaction (ORR) on platinum catalyst is a critical parameter for application in polymer electrolyte membrane fuel cells (PEMFCs). Herein, we study the effects of sulfur on the electrochemical activity and stability of sulfur doped graphene supported platinum nanowires (PtNW/SGs). To investigate the influence of sulfur, a series of sulfur-doped graphene materials with varying sulfur contents ranging from 0.35 to 3.95at% are applied as platinum nanowire catalyst supports. Based on the physico-chemical characterizations, electrochemical measurements and density functional theory (DFT) calculations, we find that the amount of sulfur significantly affects the electrokinetics of the Pt nanowires. The best ORR kinetics are observed for the platinum nanowires supported on graphene with 1.40at% sulfur, showing a mass activity of 182mA/mgPt and a specific activity of 662μA/cm2Pt at 0.9V vs. RHE. At this sulfur content, well-defined platinum nanowires with diameters in the range of 4-16nm are observed that are beneficial for enhancing ORR kinetics.

Original languageEnglish
Pages (from-to)27-38
Number of pages12
JournalNano Energy
Volume19
DOIs
Publication statusPublished - Jan 1 2016
Externally publishedYes

Keywords

  • Activation energy
  • Oxygen reduction
  • Pt nanowires
  • S contents
  • S doped graphene

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • General Materials Science
  • Electrical and Electronic Engineering

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