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Benchmarking Heterogeneous Electrocatalysts for the Oxygen Evolution Reaction

McCrory, Charles C. L. and Jung, Suho and Peters, Jonas C. and Jaramillo, Thomas F. (2013) Benchmarking Heterogeneous Electrocatalysts for the Oxygen Evolution Reaction. Journal of the American Chemical Society, 135 (45). pp. 16977-16987. ISSN 0002-7863. http://resolver.caltech.edu/CaltechAUTHORS:20131213-151603830

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Abstract

Objective evaluation of the activity of electrocatalysts for water oxidation is of fundamental importance for the development of promising energy conversion technologies including integrated solar water-splitting devices, water electrolyzers, and Li-air batteries. However, current methods employed to evaluate oxygen-evolving catalysts are not standardized, making it difficult to compare the activity and stability of these materials. We report a protocol for evaluating the activity, stability, and Faradaic efficiency of electrodeposited oxygen-evolving electrocatalysts. In particular, we focus on methods for determining electrochemically active surface area and measuring electrocatalytic activity and stability under conditions relevant to an integrated solar water-splitting device. Our primary figure of merit is the overpotential required to achieve a current density of 10 mA cm^(–2) per geometric area, approximately the current density expected for a 10% efficient solar-to-fuels conversion device. Utilizing the aforementioned surface area measurements, one can determine electrocatalyst turnover frequencies. The reported protocol was used to examine the oxygen-evolution activity of the following systems in acidic and alkaline solutions: CoO_x, CoPi, CoFeO_x, NiO_x, NiCeO_x, NiCoO_x, NiCuO_x, NiFeO_x, and NiLaO_x. The oxygen-evolving activity of an electrodeposited IrO_x catalyst was also investigated for comparison. Two general observations are made from comparing the catalytic performance of the OER catalysts investigated: (1) in alkaline solution, every non-noble metal system achieved 10 mA cm^(–2) current densities at similar operating overpotentials between 0.35 and 0.43 V, and (2) every system but IrO_x was unstable under oxidative conditions in acidic solutions.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/ja407115pDOIArticle
http://pubs.acs.org/doi/abs/10.1021/ja407115pPublisherArticle
ORCID:
AuthorORCID
McCrory, Charles C. L.0000-0001-9039-7192
Jung, Suho0000-0002-8119-3902
Peters, Jonas C.0000-0002-6610-4414
Jaramillo, Thomas F.0000-0001-9900-0622
Additional Information:© 2013 American Chemical Society. Received: July 11, 2013. Publication Date (Web): October 30, 2013. This material is based upon work performed by the Joint Center for Artificial Photosynthesis, a DOE Energy Innovation Hub, supported through the Office of Science of the U.S. Department of Energy under award no. DE-SC0004993. We are grateful for the many useful insights we have received regarding this work from various members of the electrochemistry community. In particular, we would like to acknowledge useful discussions with Allen J. Bard, Fred C. Anson, Nathan S. Lewis, Carl A. Koval, Manuel P. Soriaga, and Hans-Joachim Lewerenz. XPS data was collected at the Molecular Materials Research Center of the Beckman Institute of the California Institute of Technology. The authors declare no competing financial interest.
Group:JCAP
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0004993
Record Number:CaltechAUTHORS:20131213-151603830
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20131213-151603830
Official Citation:Benchmarking Heterogeneous Electrocatalysts for the Oxygen Evolution Reaction Charles C. L. McCrory, Suho Jung, Jonas C. Peters, and Thomas F. Jaramillo Journal of the American Chemical Society 2013 135 (45), 16977-16987
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43006
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:13 Dec 2013 23:33
Last Modified:11 Apr 2017 17:13

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