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Journal of the Electrochemical Society (00134651)144(8)pp. 2652-2657
Ni-Zn-P electrodes were prepared by subsequent deposition of Ni, Ni-P, and Ni-Zn-P layers. The topmost Ni-Zn-P layer was obtained by gradual addition of zinc to the plating bath. The obtained electrodes are more stable and more active toward the hydrogen evolution reaction than Ni-Zn alloys. They are characterized by low Tafel slopes and large surface roughness of 104. They may be attractive candidates for the alkaline water electrolysis.
Journal of the Electrochemical Society (00134651)144(2)pp. 511-519
The hydrogen evolution reaction (HER) was studied on Ni-P electrodes containing 8 to 30 atomic percent P prepared by galvanostatic deposition. The electrodes were studied directly after preparation or after pretreatment by heating, leaching in HF solution, anodic oxidation, or potential cycling in the solution. The activity of these electrodes depended on the method of preparation and phosphorous content. The activity was higher for the materials deposited at lower temperatures and for those containing smaller amounts of phosphorous. The mechanism of the hydrogen evolution reaction was studied in 1 M NaOH, and the kinetic parameters were determined using steady-state polarization and electrochemical impedance spectroscopy techniques.
Journal of the Electrochemical Society (00134651)145(7)pp. 2219-2225
Nickel-molybdenum-phosphorous electrodes were prepared by electrodeposition, and their activity for the hydrogen evolution reaction was studied in 1 M NaOH using electrochemical impedance spectroscopy and steady-state polarization techniques. Active and stable electrodes were obtained by deposition of three successive layers of Ni, Ni-P, and Ni-Mo-P and creating a concentration gradient in the topmost layer. It was found that the increase in electrode activity was due to increases in both the surface roughness and the intrinsic activity, as compared with Ni-P, Ni-Mo, and Ni electrodes. The reaction mechanism and the kinetic parameters were determined.
Journal of Applied Electrochemistry (15728838)29(8)pp. 979-986
The surface roughness of porous Ni-Zn-P electrodes was studied in 1 M NaOH using in situ electrochemical techniques: ratio of the polarization current densities, electrochemical impedance spectroscopy, cyclic voltammetry, coulometric oxidation of the surface, and a new technique of a CO molecular probe. The obtained surface roughness was about 5.5×103. Good agreement was observed between the results obtained by all these techniques.
