Electrochemical Contact Adsorption Site Changes Driven by Field and Charge Fact and Theory

Abstract

When solvated anions like chloride or cyanide adsorb on metal electrodes from aqueous media they lost part of their solvation shell yielding a direct metal-ion bond. For certain anions this 'contact' adsorption can occur even when the electrode carries net negative charge. On the basis of classical electrochemical measurements and deductive reasoning using simple models, electrochemists have evolved a detailed 'standard model' of the disposition of ions, water, and organics adsorbed on the electrode in the range of potentials where the electric double layer is thermodynamically stable. There is evidence that the anions are physisorbed. However, it is only in more recent years through a variety of in situ probes of vibrational properties (ftir and raman) and geometry (sexafs and gixs) that this model is being really tested.

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Document Details

Document Type
Technical Report
Publication Date
Apr 19, 1991
Accession Number
ADA237127

Entities

People

  • Michael R. Philpott

Organizations

  • International Business Machines Corporation (Armonk, NY)

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Band Structures
  • Carbon Monoxide
  • Chemistry
  • Crystal Structure
  • Crystals
  • Dielectric Gases
  • Electric Double Layer
  • Electrodes
  • Films
  • Frequency
  • Frequency Shift
  • Materials Science
  • Military Research
  • Spectra
  • Spectroscopy
  • Thermodynamic Properties
  • X Rays

Readers

  • Electrochemical Engineering/ Fuel Cell Technologies
  • Theoretical Analysis.