In Situ Analysis of the Facets of Cu-Based Electrocatalysts in Alkaline Media Using Pb Underpotential Deposition

Degenhart Hochfilzer, Aarti Tiwari, Ezra L. Clark, Anton Simon Bjørnlund, Thomas Maagaard, Sebastian Horch, Brian Seger, Ib Chorkendorff, Jakob Kibsgaard

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Establishing relationships between the surface atomic structure and activity of Cu-based electrocatalysts for CO2 and CO reduction is hindered by probable surface restructuring under working conditions. Insights into these structural evolutions are scarce as techniques for monitoring the surface facets in conventional experimental designs are lacking. To directly correlate surface reconstructions to changes in selectivity or activity, the development of surface-sensitive, electrochemical probes is highly desirable. Here, we report the underpotential deposition of lead over three low index Cu single crystals in alkaline media, the preferred electrolyte for CO reduction studies. We find that underpotential deposition of Pb onto these facets occurs at distinct potentials, and we use these benchmarks to probe the predominant facet of polycrystalline Cu electrodes in situ. Finally, we demonstrate that Cu and Pb form an irreversible surface alloy during underpotential deposition, which limits this method to investigating the surface atomic structure after reaction.

Original languageEnglish (US)
Pages (from-to)1514-1521
Number of pages8
JournalLangmuir
Volume38
Issue number4
DOIs
StatePublished - Feb 1 2022

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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