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1708137 
Journal Article 
Sulphur Dioxide Poisoning and Recovery of Platinum Nanoparticles: Effect of Particle Size 
Saleh, MM; Awad, MI; Kitamura, F; Ohsaka, T 
2012 
Yes 
International Journal of Electrochemical Science
ISSN: 1452-3981 
7 
12 
12004-12020 
WOS:000312936700028 
The effect of the size of platinum nanoparticles (nano-Pt) deposited onto glassy carbon (GC) electrode (GC/nano-Pt) on the SO2 poisoning and recovery is examined. Both hydrogen adsorption and oxygen reduction reaction (ORR) are utilized for the quantification of the extent of poisoning and recovery. Cyclic voltammetry (CV) and scanning electron microscopy (SEM) were used to characterize the GC/nano-Pt. Two procedures were used in the recovery of the electrodes activity, i.e., the short-range (1.0 to 0.1 V (vs. RHE)) and long-range (0 to 1.5 V) recovery. GC/nano-Pt electrode showed Pt particle size-dependent poisoning-recovery behavior. For the smallest Pt particle size (20 nm) used in the present study the largest extent of the recovery was achieved using either the short-range or long-range recovery procedure. The particles of 20 nm showed similar to 83% current recovery after the short-range recovery and similar to 100% after the long-range recovery, while those of the largest particle size (480 nm) used in this investigation showed only 67 and 87% current recovery after short-range and long-range recovery, respectively. An attempt to interpret the effects of the nanoparticles size on the poisoning and recovery behavior is introduced. The present experimental framework and analyses may help in the optimization of the Pt particle size in the ORR and the choice of the recovery approach of SO2 poisoning. 
Nano; Platinum; Oxygen; Particle size; SO2; Fuel cell