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Creating Rapid Oxygen Oscillations in Microbial Single-cell Growth Analysis using a Microfluidic Double-layer Device
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Oxygen reduction reaction at three-phase interfaces.

Ram Subbaraman1, Dusan Strmcnik, Arvydas P Paulikas

  • 1Nuclear Engineering Department, Argonne National Laboratory, Argonne, IL 60439, USA.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|July 22, 2010
PubMed
Summary
This summary is machine-generated.

Nafion sulfonate anions specifically adsorb onto platinum surfaces, inhibiting the oxygen reduction reaction (ORR). This specific adsorption, analogous to sulfate adsorption, impacts catalyst performance and deactivation.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Surface Science

Background:

  • The oxygen reduction reaction (ORR) is crucial for fuel cell performance.
  • Understanding the role of electrolytes like Nafion at the electrode interface is vital for catalyst development.
  • Previous assumptions considered Nafion a non-adsorbing electrolyte.

Purpose of the Study:

  • To investigate the specific adsorption of Nafion sulfonate anions on various platinum surfaces.
  • To determine the influence of surface structure and composition on Nafion adsorption.
  • To elucidate the impact of Nafion adsorption on the kinetics of the oxygen reduction reaction.

Main Methods:

  • Studying ORR kinetics at metal-supporting electrolyte-Nafion three-phase interfaces.
  • Utilizing well-defined Pt(hkl) single-crystal surfaces, polycrystalline platinum, and Pt-skin surfaces.
  • Characterizing adsorption behavior on high-surface-area nanostructured thin-film (NSTF) catalysts.

Main Results:

  • Nafion sulfonate anions specifically adsorb on a wide range of platinum surfaces, including single crystals, polycrystals, and nanostructured catalysts.
  • Adsorption strength and surface coverage depend on platinum surface geometry and atom type.
  • ORR kinetics are inhibited by Nafion presence, confirming specific ionomer adsorption and challenging the non-adsorbing electrolyte assumption.

Conclusions:

  • Nafion is not a non-adsorbing electrolyte; its sulfonate anions specifically adsorb on platinum electrode surfaces.
  • This specific adsorption influences ORR kinetics and contributes to catalyst deactivation.
  • Understanding these interactions is key for designing more efficient and durable electrocatalysts.