Changes in the surface morphology of platinum electrodes produced by the application of periodic potential treatments in alkaline solution

Visintín, Arnaldo; Triaca, Walter Enrique; Arvía, Alejandro Jorge

doi:10.1016/0022-0728(90)85051-6

Cited by 29 publications

(11 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3 shows a series of cyclic voltammograms recorded with a Pt disc electrode in 1 M KOH, at 50 mV s À1 , with variable anodic limits (E A ). The overall pattern agrees with those reported by other authors [40,41]. As E A became progressively more positive, a cathodic peak ascribed to the reduction of Pt surface oxides became increasingly evident, during the reverse scan.…”

Section: 2supporting

confidence: 90%

The HER in alkaline media on Pt-modified three-dimensional Ni cathodes

Fiameni¹,

Herrãiz‐Cardona

Musiani³

et al. 2012

International Journal of Hydrogen Energy

View full text Add to dashboard Cite

a b s t r a c tElectrodeposited porous Ni layers and commercial Ni foams were submitted to spontaneous deposition of Pt, achieved by immersing the Ni substrates in H 2 PtCl 6 solutions, at open circuit, to produce Pt-modified 3D Ni electrodes. When using Ni foams, the immersion was prolonged until the whole amount of H 2 PtCl 6 in the solution had reacted. Such an approach, which granted an easy control of the Pt loading, could not be used for Ni electrodeposits, since they underwent significant corrosion. The true Pt surface area was determined by measuring, for each electrode, the hydrogen desorption charge according to methods described in the literature. The ratios between Pt surface area and Pt loading were higher for Ni foam electrodes than for porous Ni electrodeposits. Both kinds of Pt-modified Ni electrodes were used as cathodes for hydrogen evolution in 1 M KOH. Cathodes with Pt loading below 0.5 mg cm À2 (referred to geometric surface area) evolved hydrogen at À100 mA cm À2 with a À75 mV overpotential. The better activity of foam electrodes as compared to electrodeposits, especially at low Pt loading, was mainly due to their higher Pt surface area per unit Pt mass.

show abstract

Section: 2supporting

confidence: 90%

The HER in alkaline media on Pt-modified three-dimensional Ni cathodes

Fiameni¹,

Herrãiz‐Cardona

Musiani³

et al. 2012

International Journal of Hydrogen Energy

View full text Add to dashboard Cite

show abstract

“…Reaction (2) under the present conditions is thermodynamically feasible. Accordingly, when the porous structure is filled with Ag+ ion-containing solution, the reaction at pores during potential cycling (Fig.…”

Section: The Ag+-h Atom Displacement Reaction and The Ag/ag+ Electrode Reaction At Poresmentioning

confidence: 75%

A study on the voltammetric behaviour of silver on electrodispersed platinum electrodes in acid solution

Martins¹,

Salvarezza²,

Arvía³

1991

Electrochimica Acta

Self Cite

View full text Add to dashboard Cite

The early stages of Ag electrodeposition on columnar structured Pt electrodes was investigated in acid solutions covering the underpotential deposition (upd) and overpotential deposition (opd) ranges. Results show a remarkable dependence of the Ag growth mode on the electrode roughness and potential sweep rate. At high potential sweep rates and large substrate roughness factors a 3-D to 2-D rearrangement can be detected. This process appears to be also accompanied by a Pt-Ag formation. For this type of electrode, both processes hinder the nucleation and growth of the 3-D Ag phase. Under certain conditions the complete Ag plating of the entire porous structure can be produced and the voltammetric behaviour of the system then approaches that observed for the Ag/Ag+ electrode reaction at an electrochemical thin layer cell.

show abstract

“…The significance of the changes caused by cathodic corrosion is emphasized by comparing them to modifications caused by repeatedly cycling at predominantly anodic potentials 35 36 37 . These latter cycling procedures can modify electrode surfaces by repeatedly oxidizing and reducing platinum in experiments that typically last 5 –10 min.…”

Section: Discussionmentioning

confidence: 99%

Anisotropic etching of platinum electrodes at the onset of cathodic corrosion

2016

View full text Add to dashboard Cite

Cathodic corrosion is a process that etches metal electrodes under cathodic polarization. This process is presumed to occur through anionic metallic reaction intermediates, but the exact nature of these intermediates and the onset potential of their formation is unknown. Here we determine the onset potential of cathodic corrosion on platinum electrodes. Electrodes are characterized electrochemically before and after cathodic polarization in 10 M sodium hydroxide, revealing that changes in the electrode surface start at an electrode potential of −1.3 V versus the normal hydrogen electrode. The value of this onset potential rules out previous hypotheses regarding the nature of cathodic corrosion. Scanning electron microscopy shows the formation of well-defined etch pits with a specific orientation, which match the voltammetric data and indicate a remarkable anisotropy in the cathodic etching process, favouring the creation of (100) sites. Such anisotropy is hypothesized to be due to surface charge-induced adsorption of electrolyte cations.

show abstract

Changes in the surface morphology of platinum electrodes produced by the application of periodic potential treatments in alkaline solution

Cited by 29 publications

References 31 publications

The HER in alkaline media on Pt-modified three-dimensional Ni cathodes

The HER in alkaline media on Pt-modified three-dimensional Ni cathodes

A study on the voltammetric behaviour of silver on electrodispersed platinum electrodes in acid solution

Anisotropic etching of platinum electrodes at the onset of cathodic corrosion

Contact Info

Product

Resources

About