Mercury Underpotential Deposition to Determine Iridium and Iridium Oxide Electrochemical Surface Areas

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Abstract

Determining the surface areas of electrocatalysts is critical for separating the key properties of area-specific activity and electrochemical surface area from mass activity. Hydrogen underpotential deposition and carbon monoxide oxidation are typically used to evaluate iridium (Ir) surface areas, but are ineffective on oxides and can be sensitive to surface oxides formed on Ir metals. Mercury underpotential deposition is presented in this study as an alternative, able to produce reasonable surface areas on Ir and Ir oxide nanoparticles, and able to produce similar surface areas prior to and following characterization in oxygen evolution. Reliable electrochemical surface areas allow for comparative studies of different catalyst types and the characterization of advanced oxygen evolution catalysts. They also enable the study of catalyst degradation in durability testing, both areas of increasing importance within electrolysis and electrocatalysis.

Original languageAmerican English
Pages (from-to)F3051-F3056
JournalJournal of the Electrochemical Society
Volume163
Issue number11
DOIs
StatePublished - 2016

Bibliographical note

Publisher Copyright:
© The Author(s) 2016.

NREL Publication Number

  • NREL/JA-5900-66914

Keywords

  • electrocatalysis
  • electrochemical surface area
  • electrolysis
  • iridium

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