Silver Electrocrystallization onto Carbon Electrodes with Different Surface Morphology: Active Sites vs Surface Features

Autor:	N. Batina, and I. González, M. Miranda-Hernández
Rok vydání:	2001
Předmět:	Materials science Morphology (linguistics) Nucleation chemistry.chemical_element Nanotechnology Electrolyte Surfaces Coatings and Films Chemical engineering chemistry Electrode Materials Chemistry Surface roughness Graphite Physical and Theoretical Chemistry Cyclic voltammetry Carbon
Zdroj:	The Journal of Physical Chemistry B. 105:4214-4223
ISSN:	1520-5207 1520-6106
DOI:	10.1021/jp002057d
Popis:	The influence of the electrode surface quality and surface morphology on the silver electrocrystallization process onto a carbon substrate from 10-2 M Ag(NH3)2+/1.6 M NH3, 1 M KNO3 (pH = 11) electrolyte solution was studied. Three substrates with different types of surface morphology and surface roughness were used: highly oriented pyrolitic graphite (HOPG), mechanically polished vitreous carbon (MPVC), and fractured vitreous carbon (FVC). Before the silver deposition process, the electrode surface was examined and characterized by means of Atomic Force Microscopy (AFM) analysis. Evaluation of the kinetic parameters of the silver nucleation and the growth behavior, as well as other characteristics of the silver electrocrystallization process onto carbon substrates, were based on cyclic voltammetry and chronoamperometric measurements. Cyclic voltammetry data also show that silver deposition efficiency is proportional to the increase of electrode surface roughness (from HOPG, via MPVC to FVC). The silver b...
Databáze:	OpenAIRE
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