Ni-Zr alloys: relationship between surface characteristics and electrocatalytic behavior
| Autor: | Francesco Rosalbino, Carlo Antonione, Marcello Baricco, M. Fabrizio, Emma Paola Maria Virginia Angelini, S. Daolio |
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| Rok vydání: | 2000 |
| Předmět: |
Amorphous metal
Scanning electron microscope Chemistry Organic Chemistry technology industry and agriculture Analytical chemistry Exchange current density Isotropic etching Nanocrystalline material Analytical Chemistry Secondary ion mass spectrometry Differential scanning calorimetry Chemical engineering Dissolution Spectroscopy |
| Zdroj: | Scopus-Elsevier |
| ISSN: | 1097-0231 0951-4198 |
| DOI: | 10.1002/(sici)1097-0231(20000515)14:9<800::aid-rcm947>3.0.co;2-f |
| Popis: | A relationship between electrocatalytic activity for the hydrogen evolution reaction and the surface composition of the electrode was established for Ni-Zr crystalline and amorphous alloys by means of secondary ion mass spectrometry (SIMS). Electrocatalytic activity was tested by means of cathodic polarization in 1 M KOH at 25 °C and the resulting exchange current density has been taken as a measure of catalytic efficiency. Surface activation treatment involved chemical etching in HF solutions; the consequent morphological and compositional surface changes were studied by differential scanning calorimetry (DSC), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The electrochemical behavior of the pure elements (Ni and Zr) was also considered for comparison. All samples submitted to chemical etching in HF solutions showed an increase in electrocatalytic activity, particularly the alloy with the highest Ni content. The beneficial effect of chemical etching is due to dissolution of the zirconium oxide layer and to the formation of nanocrystalline Ni on the surfaces. Copyright © 2000 John Wiley & Sons, Ltd. |
| Databáze: | OpenAIRE |
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