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

Alia, Shaun M.; Hurst, Katherine E.; Kocha, Shyam S.; Pivovar, Bryan S.

doi:10.1149/2.0071611jes

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

Journal Article · Thu Jun 02 00:00:00 EDT 2016 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/2.0071611jes· OSTI ID:1290786

Alia, Shaun M. ^[1]; Hurst, Katherine E. ^[1]; Kocha, Shyam S. ^[1]; Pivovar, Bryan S. ^[1]

National Renewable Energy Lab. (NREL), Golden, CO (United States). Chemical and Materials Science Center

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.

View Accepted Manuscript (DOE)

Research Organization:: NREL (National Renewable Energy Laboratory (NREL), Golden, CO (United States))

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC36-08GO28308; SC0007471

OSTI ID:: 1290786

Report Number(s):: NREL/JA--5900-66914

Journal Information:: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 11 Vol. 163; ISSN 0013-4651

Publisher:: The Electrochemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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