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Formic acid oxidation on platinum: a simple mechanistic study.

Kathleen A Schwarz1, Ravishankar Sundararaman, Thomas P Moffat

  • 1National Institute of Standards and Technology, Material Measurement Laboratory, 100 Bureau Dr, Gaithersburg, MD, USA. kas4@nist.gov.

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Summary
This summary is machine-generated.

The formate anion, not the acid, drives formic acid oxidation on platinum fuel cell catalysts. This electrocatalytic mechanism, clarified by joint density functional theory, is key to understanding fuel cell reactions.

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Area of Science:

  • Electrocatalysis
  • Surface Science
  • Computational Chemistry

Background:

  • Electrocatalytic oxidation of small organic acids is crucial for fuel cell technology.
  • The reaction mechanism of formic acid oxidation on platinum remains debated, with conflicting evidence on whether the acid or anion is the active species.
  • Previous theoretical studies have not fully explored the role of the formate anion due to computational challenges.

Purpose of the Study:

  • To investigate the electrocatalytic oxidation mechanism of formic acid on platinum using ab initio calculations.
  • To resolve the debate regarding the reactant species (formic acid vs. formate anion) in this reaction.
  • To elucidate the role of surface coverage and potential control in the reaction pathway.

Main Methods:

  • Utilized the joint density functional theory (JDFT) framework, a novel computational approach for electrochemical systems.
  • Performed ab initio calculations on a platinum (Pt(111)) surface model.
  • Simulated the approach of a formate anion to the platinum surface under electrochemical conditions.

Main Results:

  • The formate anion reacts with the platinum surface to produce CO2 and adsorbed H with no activation barrier at typical operating voltages.
  • The reaction rate is directly proportional to formate concentration and the availability of platinum surface sites.
  • High surface coverage by adsorbates significantly increases reaction barriers, suggesting that available metal sites are a limiting factor.

Conclusions:

  • The formate anion is the active species in the electrocatalytic oxidation of formic acid on platinum.
  • The proposed mechanism explains experimental observations and highlights the importance of available surface sites for reaction rates.
  • This study provides critical insights into fuel cell reaction mechanisms and informs catalyst design.