Influence of deposition current density on the composition and properties of electrodeposited Ni+RuO2 and Ni+IrO2 composites

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

“…3b). The presence of the peak IIIc together with the peaks 2a and 2c could be detected on the CV of Ni-RuO 2 coating electrodeposited from chloride bath (45 g dm -3 NiCl 2 + 0.37 g dm -3 HCl + 30 g dm -3 H 3 BO 3 + 0.03 g dm -3 sodium dodecyl sulfate) [21], while on the CV's of the Ni-RuO 2 coatings electrodeposited from 0.2M NiCl 2 + 2M NH 4 Cl bath [5,22] only peaks 2a and 2c are present. …”

“…The peaks 1a and 2a, present on cycles 2-5 are the consequence of the formation of -Ni(OH) 2, -Ni(OH) 2 and NiOOH (oxidation of Ni), while the peak 2c corresponds to the reduction of NiOOH, which is typical for the Ni based cathodes [12][13][14][15][16][17][18][19][20]. The CV's recorded during the last cycling procedure (cycles [21][22][23][24][25] are presented in Fig. 3b.…”

“…The same conclusion concerning the shape of the CV's as the one given for the DN electrode is valid for this electrode. The typical CV's recorded during the last cycling procedure (cycles [21][22][23][24][25] are presented in Fig. 4b.…”

Electrocatalytic activity of porous Ni–Fe–Mo–C–LaNi5 sintered electrodes for hydrogen evolution reaction in alkaline solution

“…67 For the LF semicircle, R 2 decreases with the overpotential and s 2 decreasing, and that s 2 varies until two orders of magnitude with overpotential. This behaviour is consistent with the charge transfer phenomenon.…”

Template-Free Hydrothermal Synthesis of Nanorod (RuTi)O2 Composite Cathode for Hydrogen Evolution in Alkali Solution

“…To reduce the energy consumption and improve the efficiency of hydrogen production, many research efforts have been devoted to decrease the over-potential of the electrode for hydrogen evolution reaction (HER) by the modification of material properties [4], the development of new electrode materials [5,6], the formation of composite electrode materials [7,8], and the fabrication of the electrode materials with nanoarchitectures [9,10]. As the hydrogen evolution reaction (HER) can occur only at confined spatial sites called the reactive two-phase zone (solid/liquid interface), nanoscale control in morphology and dispersion is considered greatly promising in optimizing the properties of the catalysts [11].…”