کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
188884 459669 2012 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A quantitative research on S- and SO2-poisoning Pt/Vulcan carbon fuel cell catalyst
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
A quantitative research on S- and SO2-poisoning Pt/Vulcan carbon fuel cell catalyst
چکیده انگلیسی

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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 67, 15 April 2012, Pages 50–54
نویسندگان
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