Determination of kinetic parameters for the hydrogen evolution reaction on the electrodeposited Ni–MoO2 composite coating in alkaline solution

Ni-MoO2 cathodes for hydrogen evolution in alkaline solutions. Effect of the conditions of their electrodeposition

“…As can be seen, spectra 1, 2, and 6 correspond to the Ni-rich surface, while spectra 3, 4, and 5 correspond to the Mo-rich surface. Similar morphologies and compositions were obtained for samples electrodeposited from ammoniacal NiCl 2 solution [17][18][19], except that a larger part of the surface of the Ni-MoO 2 composite coatings obtained in our previous work [17][18][19] was richer in Ni, while a smaller part contained a high percentage of Mo.…”

“…Hence, for industrial application, advanced electrocatalytic materials for HER are of great importance to increase energy efficiency. Since porous Ni (Raney Ni) electrodes showed extensive deactivation during electrolysis, several approaches to design and produce new electrocatalytic cathode materials have been presented in the past [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. One of these approaches is based on the Brewer intermetallic bonding theory, which predicts a synergetic activation effect whenever metals of the left half of the d-series are alloyed with metals of the right half of the d-series [4][5][6][7][8][9][10].…”

“…Recently, particular attention has been given to the replacement of expensive Ni + RuO 2 [14] composite coating with coatings obtained by the electrodeposition of Ni with molybdenum oxide species [16][17][18][19][20]. It was shown that Ni-MoO 3 [16,20] composite coatings, electrodeposited from a suspension containing different concentrations of MoO 3 particles in a Watt's type bath, possess good catalytic activity, but their properties during the "service life" test were not good enough for application in industrial electrolysis [18].…”

Electrodeposited, Ni-based, non-noble metal coatings as cathodes for hydrogen evolution in chlor-alkali electrolysis

“…2b, indicating that Ni-MoO 2 composite coatings, deposited under conditions described above in the apparatus presented in Fig. 1, could be promising replacement for the commercial cathodes based on the Ni-RuO 2 composite coatings [5][6][7][8][9]. Taking into account that in the industrial electrolysis the current density for the HER is usually -0.3 A cm -2 , considering polarization curves presented in Fig.…”

“…The HER has been so far investigated by our group on two types of electrodeposited, Ni-based, non-noble metal coatings: composite coatings with inclusion of MoO 2 particles [5][6][7][8][9] and electrodeposited NiSn alloy coatings [10,11]. The purpose of such work was to find suitable replacement for the noble metal coatings, particularly for the commercial De Nora's Ni-RuO 2 cathode (deposited onto Ni mesh 40), as cathodes for industrial application in the zero-gap membrane cell for chloralkali electrolysis.…”