Real-time investigations of Pt(111) surface transformations in sulfuric acid solutions

Björn Braunschweig, Prabuddha Mukherjee, Dana D Dlott, Andrzej Wieckowski

Research output: Contribution to journalArticle

Abstract

We present the first broadband sum-frequency generation (SFG) spectra of adlayers from sulfuric acid solutions on Pt(111) surfaces and reveal surface transformations of (bi)sulfate anions in unprecedented detail. SFG amplitudes, bandwidth, and electrochemical Stark tuning of (bi)sulfate vibrational bands centered at 1250-1290 cm-1 strongly depend on the applied potential and are correlated with prominent voltammetric features. (Bi)sulfate adlayers on Pt(111) are important model systems for weak, specific adsorption of anions on catalytically active surfaces. Although the existence of surface transformations on Pt(111) in dilute H2SO4 solutions has been established by previous studies, so far they have not been observed with surface vibrational spectroscopy. Our results confirm previous reports of a surface transformation at 0.21 V and provide new information on a second transformation at 0.5 V due to surface hydroxyl formation and rearrangement of the electric double layer.

Original languageEnglish (US)
Pages (from-to)14036-14038
Number of pages3
JournalJournal of the American Chemical Society
Volume132
Issue number40
DOIs
StatePublished - Oct 13 2010

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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