Main activities and results 2018

WP 5 – Electrochemical performance of metallic nanofoams as electrodes for hydrogen production

Task 5.1 – Testing of electrodes for the production of hydrogen from water
electrolysis

In order to assess the electrocatalytic activity of HER electrocatalyst coatings, direct measurement of the gas volumes involving Hofmann’s cell have been performed.

 The cathodic efficiency of hydrogen amount produced during seawater electrolysis has been then determined for different Ni-Mo alloy compositions and applied current densities, as presented in Table 1.

Table 1. Cathodic efficiency of hydrogen evolution in seawater electrolyte (h) for different values of the applied current

Galvanostatic transients for NiMo_ILC_Nif deposits having different alloy compositions in seawater at a constant applied current density of 20 mA/cm2
Galvanostatic transients for NiMo_ILC_Nif deposits (32 wt.% Mo) in seawater at different values of the applied current density

Long term electrochemical stability involving cyclic voltammetry in seawater as electrolyte

Left: Cyclic voltammograms in seawater for Nif deposit (100 mV/s, Selectrode = 0.635 cm2); Right: Long term stability considering the current value at fixed potentials

Left: Cyclic voltammograms in seawater for Pt/Nif deposit (100 mV/s, Selectrode = 0.635 cm2); Right: Long term stability considering the current value at fixed potentials

Left: Cyclic voltammograms in seawater for NiMo_ILC17/Nif deposit (100 mV/s, Selectrode = 0.635 cm2); Right: Long term stability considering the current value at fixed potentials

Left: Cyclic voltammograms in seawater for depozitului Pt_NiMo /Nif deposit (100 mV/s, Selectrode = 0.635 cm2); Right: Long term stability considering the current value at fixed potentials