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Al-Pt compounds catalyzing the oxygen evolution reaction.

Ana María Barrios Jiménez1, Olga Sichevych1, Ioannis Spanos2

  • 1Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, 01187 Dresden, Germany. Antonyshyn@fhi-berlin.mpg.de.

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|January 16, 2023
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Summary
This summary is machine-generated.

Aluminum-platinum compounds show varying stability during oxygen evolution reaction (OER) catalysis. Certain compounds like Al2Pt and Al3Pt2 offer a balance of activity and stability, making them promising OER electrocatalyst precursors.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Aluminum-platinum (Al-Pt) compounds are investigated as electrocatalysts for the oxygen evolution reaction (OER).
  • The OER involves harsh oxidative conditions that can alter catalyst composition and structure.
  • Understanding these modifications is crucial for designing stable and active electrocatalysts.

Purpose of the Study:

  • To systematically study the stability and performance of various Al-Pt compounds under OER conditions.
  • To correlate the composition and crystal structure of Al-Pt compounds with their electrochemical behavior.
  • To identify promising Al-Pt compounds as precursors for efficient OER electrocatalysts.

Main Methods:

  • Electrochemical experiments were conducted to evaluate the OER activity and stability of Al-Pt compounds.
  • Compositional and structural changes were analyzed before and after electrochemical testing.
  • Surface modifications and their impact on the electronic structure of platinum were investigated.

Main Results:

  • Al-rich Al-Pt compounds (Al4Pt, Al21Pt8) exhibit significant aluminum leaching.
  • Other Al-Pt compounds (Al2Pt, Al3Pt2, rt-AlPt, Al3Pt5, rt-AlPt3) show surface or near-surface modifications.
  • Surface changes lead to the in situ formation of catalytically active phases, including Pt-rich Al-Pt intermetallics and Pt oxides.

Conclusions:

  • The stability of Al-Pt compounds during OER is highly dependent on their composition and crystal structure.
  • Surface modification can enhance catalytic activity by altering the electronic structure of platinum.
  • Al2Pt and Al3Pt2 are identified as promising precursors for OER electrocatalysts due to their balance of activity and stability.