A quantitative research on S- and SO2-poisoning Pt/Vulcan carbon fuel cell catalyst

F Xie, Z G Shao, G Zhang, J Zhai, W Lu, X Qin, Wenfeng Lin, B Yi

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23 Citations (Scopus)
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Abstract

A quantitative research on S and SO2 poisoning Pt/Vulcan carbon (Pt/VC) catalysts for fuel cells was conducted by the three-electrode method. Pt/VC electrodes were contaminated by submersion in a SO2-containing solution made up of 0.2 mM Na2SO3 and 0.5 M H2SO4 for different periods of time, and held at 0.05 V (vs. RHE) in 0.5 M H2SO4 solutions in order to gain zero-valence sulfur (S0) poisoned electrodes. The sulfur coverage of Pt was determined from the total charge consumed as the sulfur was oxidized from S0 at 0.05 V (vs. RHE) to sulfate at >1.1 V (vs. RHE). The summation of initial coverage of S0 (θS) and coverage of H (θH) are approximately equal to 1 (θH + θS = 1) when 0.5 < θH < 1, which gives an easy way to figure out the quantity of sulfur adsorbed on Pt/VC. As to SO2 poisoned Pt/VC, the catalytic activity of oxygen reduction reaction (ORR) decreases linearly with the amount of SO2 adsorbed on the Pt nanoparticles when 0.45 < θH < 0.81. When the adsorbed SO2 was reduced to S0, the mass activity was greatly recovered, and the area specific activity was even higher than the unpoisoned Pt/VC.
Original languageEnglish
Pages (from-to)50-54
Number of pages5
JournalElectrochimica Acta
Volume67
Early online date07 Feb 2012
DOIs
Publication statusPublished - 15 Apr 2012

ASJC Scopus subject areas

  • Electrochemistry
  • General Chemical Engineering

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