In situ electrochemical X-ray absorption spectroscopy of oxygen reduction electrocatalysis with high oxygen flux

Evan M. Erickson, Matthew S. Thorum, Relja Vasić, Nebojŝa S. Marinković, Anatoly I. Frenkel, Andrew A. Gewirth, Ralph G. Nuzzo

Research output: Contribution to journalArticle

Abstract

An in situ electrochemical X-ray absorption spectroscopy (XAS) cell has been fabricated that enables high oxygen flux to the working electrode by utilizing a thin poly(dimethylsiloxane) (PDMS) window. This cell design enables in situ XAS investigations of the oxygen reduction reaction (ORR) at high operating current densities greater than 1 mA in an oxygen-purged environment. When the cell was used to study the ORR for a Pt on carbon electrocatalyst, the data revealed a progressive evolution of the electronic structure of the metal clusters that is both potential-dependent and strongly current-dependent. The trends establish a direct correlation to d-state occupancies that directly tracks the character of the Pt-O bonding present.

Original languageEnglish (US)
Pages (from-to)197-200
Number of pages4
JournalJournal of the American Chemical Society
Volume134
Issue number1
DOIs
StatePublished - Jan 11 2012

ASJC Scopus subject areas

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

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