Abstract
In spite of possessing a highly active catalyst, a porous gas diffusion electrode exhibits only a very poor performance when the catalyst used is too wettable with electrolyte. This paper is an attempt to restore the performance for this case. The polarization loss of 0.8% Ti-doped Raney nickel electrode was approximately halved by applying a load current increasing gradually up to the limiting current. The more wettable 1.1% Ti-doped electrode could be recovered from an extremely low performance by applying the similar load but employing concentrated electrolyte solution. Based on the diffusivity data obtained, the depolarization effect found was attributed to thinning of the electrolyte film. Surface analyses by means of XPS reveal that the wettability enhancement caused by the Ti-doping is due to a TiO 2 deposit covering a large part of the catalytic surface.
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