Electrochemical evaluation of a Ni alloy as an electrocatalyst to produce H2
Abstract
An electrochemical study is presented to evaluate a Ni alloy used as a cathode and determine its viability in the production of hydrogen in a basic and acid electrolytic medium. A treatment was applied to the surface of the Ni alloy using a 0.6 M FeCl3 solution to provide a greater surface area. For comparison purposes, an A304 stainless steel electrode was also used as the cathode. Cyclic voltammetry and chronoamperometry tests were carried out in a range of potentials between -2.0 to 0.0 V, to evaluate the current density during the evolution of hydrogen. It was determined that the current density obtained in the basic medium was much lower than with the acid medium, in both electrodes analyzed. While, with the Ni base alloy, there were lower overpotentials for the initiation of the hydrogen evolution reaction, as well as a higher current density than with A304 stainless steel. Furthermore, an increase in current density was observed when the treatment was applied to the Ni base alloy, attributed to an increase in the catalytic surface area of the alloy.
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