• 文献标题:   Optimization of sulfur-doped graphene as an emerging platinum nanowires support for oxygen reduction reaction
  • 文献类型:   Article
  • 作  者:   HOQUE MA, HASSAN FM, SEO MH, CHOI JY, PRITZKER M, KNIGHTS S, YE SY, CHEN ZW
  • 作者关键词:   s doped graphene, s content, pt nanowire, oxygen reduction, activation energy
  • 出版物名称:   NANO ENERGY
  • ISSN:   2211-2855 EI 2211-3282
  • 通讯作者地址:   Univ Waterloo
  • 被引频次:   31
  • DOI:   10.1016/j.nanoen.2015.11.004
  • 出版年:   2016

▎ 摘  要

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 3.95 at% 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 1.40 at% sulfur, showing a mass activity of 182 mA/mg(Pt) and a specific activity of 662 mu A/cm(Pt)(2) at 0.9 V vs. RHE. At this sulfur content, well-defined platinum nanowires with diameters in the range of 4-16 nm are observed that are beneficial for enhancing ORR kinetics. (C) 2015 Elsevier Ltd. All rights reserved.