Collect. Czech. Chem. Commun. 1991, 56, 140-151

Catalytic effects in the electrochemical reactions involving nickel and cysteine. Voltammetric studies

Florinel Gabriel Banica and Elena Diacu

Polytechnic Institute of Bucharest, Faculty of Industrial Chemistry, Spl. Independentei 313, Bucharest, Romania


The electrode reactions in the nickel-cysteine system at pH-values around 7 were studied by cyclic voltammetry on the hanging mercury drop electrode. The following processes are induced by cysteine:1) the catalytic reduction of the nickel ion; 2) the anodic dissolution of the nickel amalgam by a catalytic mechanism; 3) the catalytic evolution of hydrogen. Some analogies with the behaviour of the nickel center in hydrogenase are suggested.