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Related Experiment Videos

Calculating reversible potentials for Pt-H and Pt-OH bond formation in basic solutions.

Yu Cai1, Alfred B Anderson

  • 1Department of Chemistry, Case Western Reserve University, Cleveland, Ohio 44106, USA.

The Journal of Physical Chemistry. B
|July 21, 2006
PubMed
Summary
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This study explored platinum electrode redox reactions in base, focusing on hydrogen and water electro-oxidation. The findings validate predictive models for surface reactions, crucial for electrochemical applications.

Area of Science:

  • Electrochemistry
  • Surface Science
  • Physical Chemistry

Background:

  • Studied redox reactions on platinum electrodes in basic solutions.
  • Focused on underpotential deposited hydrogen (Pt-H bond) and water electro-oxidation (Pt-OH bond).

Purpose of the Study:

  • To investigate and model two key redox reactions on platinum electrodes in alkaline media.
  • To compare the efficacy of linear correlation and double-layer models for predicting surface reaction potentials.

Main Methods:

  • Employed a linear relationship between reaction energy and standard reversible potential (empirical and linear correlation models).
  • Utilized a double-layer model defining surface reactants/products and electrolyte influence.
  • Performed cyclic voltammetry measurements on Pt(111) electrodes.

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Main Results:

  • Calculated reversible potentials using empirical and linear correlation models closely matched experimental onset potentials.
  • The double-layer model required two water coordination shells for hydroxide stabilization in base, unlike one in acid.
  • Both modeling approaches yielded satisfactory results for Pt-H and Pt-OH formation.

Conclusions:

  • The developed models are effective for studying electron-transfer reactions in alkaline solutions.
  • These models show promise for predicting surface-bonded species formation, similar to acid solutions.