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

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. Lastly, they also enable the study of catalyst degradation in durability testing, both areas of increasing importance within electrolysis and electrocatalysis.

Authors:
 [1];  [1];  [1];  [1]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States). Chemical and Materials Science Center
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1290786
Report Number(s):
NREL/JA-5900-66914
Journal ID: ISSN 0013-4651
Grant/Contract Number:  
AC36-08GO28308; SC0007471
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 163; Journal Issue: 11; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; electrocatalysis; electrochemical surface area; electrolysis; iridium

Citation Formats

Alia, Shaun M., Hurst, Katherine E., Kocha, Shyam S., and Pivovar, Bryan S.. Mercury Underpotential Deposition to Determine Iridium and Iridium Oxide Electrochemical Surface Areas. United States: N. p., 2016. Web. https://doi.org/10.1149/2.0071611jes.
Alia, Shaun M., Hurst, Katherine E., Kocha, Shyam S., & Pivovar, Bryan S.. Mercury Underpotential Deposition to Determine Iridium and Iridium Oxide Electrochemical Surface Areas. United States. https://doi.org/10.1149/2.0071611jes
Alia, Shaun M., Hurst, Katherine E., Kocha, Shyam S., and Pivovar, Bryan S.. Thu . "Mercury Underpotential Deposition to Determine Iridium and Iridium Oxide Electrochemical Surface Areas". United States. https://doi.org/10.1149/2.0071611jes. https://www.osti.gov/servlets/purl/1290786.
@article{osti_1290786,
title = {Mercury Underpotential Deposition to Determine Iridium and Iridium Oxide Electrochemical Surface Areas},
author = {Alia, Shaun M. and Hurst, Katherine E. and Kocha, Shyam S. and Pivovar, Bryan S.},
abstractNote = {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. Lastly, they also enable the study of catalyst degradation in durability testing, both areas of increasing importance within electrolysis and electrocatalysis.},
doi = {10.1149/2.0071611jes},
journal = {Journal of the Electrochemical Society},
number = 11,
volume = 163,
place = {United States},
year = {2016},
month = {6}
}

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