Nitrate reduction catalyzed by underpotentially deposited Cd on Au(111): Identification of the electroactive surface structure

Show Jon Hsieh, Andrew A Gewirth

Research output: Contribution to journalArticlepeer-review

Abstract

The electrocatalysis of the nitrate reduction to nitrite by Cd underpotential deposition (upd) on Au(111) was studied. The structures of the Cd adlayer underpotentially deposited on a Au(111) surface with nitrate in acidic sodium sulfate electrolyte were investigated by scanning tunneling microscopy (STM). Several ordered adlattices were observed, with the catalytically active structure being a (1×1) Cd adlayer. This adlayer exhibited a Moire pattern rotated by 9° from the Au(111) lattice direction. Thiocyanate and ethanethiol were used to investigate the mechanism of the catalysis by the Cd adlayer. The addition of thiocyanate did not affect the nitrate reduction activity. On the other hand, ethanethiol was a poison toward the nitrate reduction. STM images revealed surface roughening due to ethanethiol at the potential of the reduction of nitrate. We suggest that nitrate association with the (1×1) Cd adlattice is a requirement for electroreduction activity.

Original languageEnglish (US)
Pages (from-to)9501-9512
Number of pages12
JournalLangmuir
Volume16
Issue number24
DOIs
StatePublished - Nov 28 2000

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Fingerprint Dive into the research topics of 'Nitrate reduction catalyzed by underpotentially deposited Cd on Au(111): Identification of the electroactive surface structure'. Together they form a unique fingerprint.

Cite this