Abstract
The influence of transition from ferromagnetism to paramagnetism on the activity of metal catalysts (the Hedvall effect) is explained on the basis of induced spin-polarization of adsorbed radicals. This assumption was verified using the electrochemical reduction of 2,6-diphenylpyrylium cations as a model. This reduction leads to formation of uncharged radicals that undergo fast dimerization in the bulk of the solution. Cations were reduced by spin-polarized electrons that have been generated in the conduction band of a p-GaAs photocathode, illuminated under conditions of optical orientation. When electron spin-polarization was “switched on” an inhibition of the reduction rate was observed.
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