Electroless Deposition and Electrocatalytic Activity of Ni–Re–P Alloys

Issue 3(89) 2018
Pages 26-36

V.M. Krutskikh, A.N. Frumkin Institute of Physical Chemistry and Electrochemistry of RAS
(IPCE of RAS), Moscow, Russian Federation

V.V. Zhulikov, IPCE of RAS, Moscow, Russian Federation

A.D. Aliev, IPCE of RAS, Moscow, Russian Federation

K.M. Khmeleva, Dmitry Mendeleev University of Chemical Technology, Moscow, Russian Federation


Keywords: filmschemicalcatalytic reduction of Ni-Re-P alloys, kinetics of deposition, hydrogen evolution reaction

http://www.doi.org/10.31615/j.corros.prot.2018.89.3-3 

 

Catalytic activity, chemical composition, and morphology of Ni–Re–P alloys are studied. The alloys are obtained by chemical–catalytic reduction of metal ions using sodium hypophosphite as a reducing agent. Addition of the doping Re metal into the Ni–P alloy changes the catalytic activity of the alloy surface with respect to the parallel partial reactions of heterogeneous hydrolysis of the hypophosphite ion, hydrogen evolution, reduction of nickel and phosphorus.
The presented experimental results and also the literature data on the oxidation depth of the reducing agents on different catalytically active alloys can be explained by variation of the overpotential of the hydrogen evolution reaction as dependent on the alloy surface composition. The ability of Ni–Re–P alloys with the high rhenium content to change the course of hydrolysis of the reducing agent predominantly to proton enhances their catalytic properties. The catalytic
activity of Ni–Re–P alloys with respect to the hydrogen evolution reaction is manifested in the form of an extremal dependence of current transients in 1 h of cathodic polarization under variation of the concentration of potassium perrhenate in the solution.