Reduction of silver complexes: towards an ever more elaborated insight in the influence of the type of ligand on the reaction rate

Spectro-electrochemical study of the influence of ligand adsorption on the reaction rate of the electrodeposition of silver complexes

“…show the same initial I stat vs. E ramp, but the limiting current seems to be reached earlier in the case of DTO. These observations are not in correspondence with those in [1], where pure charge transfer effects were observed: the S 2 O 2À 3 system showed the slowest charge transfer, and depending on the potential range either DTO (at the less negative potentials) either SCN À (at the most negative potentials) was the fastest system.…”

“…The meaning of the cathodic charge transfer coefficient, defined as the potential-dependency of the activation energy for the reduction reaction, should therefore rather be changed into an 'apparent' cathodic charge transfer coefficient, including all the other potential-dependent symptoms involved in the electrochemical reaction. This also explains why the results are different in [1]: due to the difference in substrate, measurements were performed in different potential regions. Both the nature and the potential of the substrate influence surface reactions such as, e.g., adsorption.…”

“…x À1=2 m 1=6 Þ. k 1 and k À1 are the potential dependent rate constants of reaction (1). Their potential dependence is given by…”

“…The influence of the type of ligand on the charge transfer rate of silver thiosulphate ðAgðS 2 O 3 Þ 3À 2 Þ, thiocyanate ðAgðSCNÞ 2À 3 Þ and 1,8-dihydroxy-3,6-dithiaoctane ðAgðDTOÞ þ 2 Þ complexes was studied [1]. By making use of a semiconducting electrode of Ti/TiO 2 , i.e.…”