Gold-supported activated NiZn coatings: hydrogen evolution and corrosion studies

Abstract

Summary Gold‐supported Raney‐type NiZn coatings were prepared on a thin Ni film‐modified copper substrate (Cu/Ni/NiZn‐Au). The hydrogen evolution activity, time stability and corrosion behaviour of the electrode was investigated in 1 M KOH solution by electrochemical, microscopic and spectroscopic technique. It was found that Au‐modified activated coatings exhibits good hydrogen evolution activity, electrochemical and physical stability as well as corrosion resistance. The enhanced hydrogen evolution activity of the Au‐modified electrode was related to the larger available surface area and/or a possible synergistic effect between the metals. Copyright © 2017 John Wiley & Sons, Ltd.

Experimental and theoretical study on hydrogen production by using Ag nanoparticle‐decorated graphite/Ni cathode

“…The j is equal to j 2 = −1, and ω = 2πf is the angular frequency. For n = 0, 0.5, and 1, the Y 0 describes an ideal resistor, homogeneous semi‐infinite diffusion, and an ideal capacitor ( Y 0 = C ), respectively 81,82 . As the catalytic effect increases, a decrease in CPE values is expected due to most likely partial blocking of electrochemically active electrode surface by freshly formed hydrogen bubbles 83 .…”

“…For n = 0, 0.5, and 1, the Y 0 describes an ideal resistor, homogeneous semiinfinite diffusion, and an ideal capacitor (Y 0 = C), respectively. 81,82 As the catalytic effect increases, a decrease in CPE values is expected due to most likely partial blocking of electrochemically active electrode surface by freshly formed hydrogen bubbles. 83 When we compared the CPE1 values with each other, it is seen that the CPE1 values obtained at all potentials for the G/Ni/Ag were lower than that for the G/Ni electrode and the values decreased with increasing cathodic potential.…”

Mesoporous Carbon as Galvanic-Corrosion Activator Accelerates Fe Degradation

“…In the Nyquist plots (Figure 5c), the change in the impedance imaginary part (z") was expressed as a function of the impedance real part (z′), which exhibited series semicircles. It was well known that the diameter of the high-frequency capacitive loop represented the polarization resistance [34,35]. Obviously, the diameters of semicircles gradually decreased with MC increasing, indicating that their corrosion resistance turned weak.…”

Cathodic activation of synthesized highly defective monoclinic hydroxyl‐functionalizedZrO2nanoparticles for efficient electrochemical production of hydrogen in alkaline media

“…[12][13][14] For instance, Solmaz group fabricated 3D Cu, 18 Ag, 19 and Ni 20 nanodomes as efficient electrocatalysts for the HER and water splitting in alkaline solutions. In another study, the same group synthesized Mo-modified carbon felt (CF), 21 MoPd//CF/Mo, 22 and Au/activated NiZn coatings 23 electrodes as effective cathodes for the alkaline hydrogen generation. Recently, in our lab, highly stable Eu 2 O 3 /TiO 2 , PdO/TiO 2 , and ZnO/TiO 2 nanocomposites have been synthesized and demonstrated as highly active electrocatalysts for the HER in alkaline electrolytes.…”