Abstract
Anodic dissolution and hydrogen evolution kinetics of Gd were investigated over the range 5°–30°C. Reaction orders with respect to pH for the HER and for anodic dissolution of Gd are temperature independent, as are the transfer coefficients. The apparent activation energy of anodic dissolution changes at the Curie temperature with that above 17°C being smaller. The change for the HER is almost the same but in the opposite direction. For both reactions there is a simultaneous change in the preexponential factor, yielding a practically smooth over‐all vs. 1/T curve. This behavior can be rationalized by addition of a ferromagnetic energy term to the activation energies. A model is proposed based on the existence of paramagnetic surface layers below the Curie temperature and the consequent introduction of an energy gradient for the transport of electrons to and from the metal surface.
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