Temperature effect on the recovery of SO2-Poisoned GC/Nano-Pt electrode towards oxygen reduction |
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| Authors: | A M Abdullah M M Saleh M I Awad Takeyoshi Okajima Fusao Kitamura Takeo Ohsaka |
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| Institution: | (1) Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259-G1-05 Nagatsuta, Midori-ku, Yokohama 226-8502, Japan;(2) Department of Chemistry, Faculty of Science, University of Cairo, Giza, 12613, Egypt; |
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| Abstract: | The SO2 poisoning of Pt nanoparticle (n-Pt) modified glassy carbon (GC/n-Pt) electrode and the recovery of its activity for the oxygen
reduction reaction (ORR) were studied using cyclic voltammetry at ambient (25 °C) and elevated (70 °C) temperatures. Recovery
of the GC/n-Pt electrode by cycling the potential within the ORR range (1.0 to 0.2 V (standard hydrogen electrode)) in 0.1 M
H2SO4 was not effective at 25 °C, but at 70 °C the onset potential of the ORR was almost the same as that at the fresh GC/n-Pt
electrode. For the two different temperatures used here, the recovery on cycling the potential between 0.4 and 1.7 V was efficient.
However, the number of cycles and the amount of charge required for the recovery at 70 °C were the smallest, which is of great
interest for the proton exchange membrane fuel cell performance. The recovery using such a wide potential range at 70 °C resulted
in an enhancement of the electrocatalytic activity of the GC/n-Pt electrode over a non-poisoned (bare) GC/n-Pt electrode. |
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