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Benchmarking Hydrogen Evolving Reaction and Oxygen Evolving Reaction Electrocatalysts for Solar Water Splitting Devices

McCrory, Charles C. L. and Jung, Suho and Ferrer, Ivonne M. and Chatman, Shawn M. and Peters, Jonas C. and Jaramillo, Thomas F. (2015) Benchmarking Hydrogen Evolving Reaction and Oxygen Evolving Reaction Electrocatalysts for Solar Water Splitting Devices. Journal of the American Chemical Society, 137 (13). pp. 4347-4357. ISSN 0002-7863. doi:10.1021/ja510442p.

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Objective comparisons of electrocatalyst activity and stability using standard methods under identical conditions are necessary to evaluate the viability of existing electrocatalysts for integration into solar-fuel devices as well as to help inform the development of new catalytic systems. Herein, we use a standard protocol as a primary screen for evaluating the activity, short-term (2 h) stability, and electrochemically active surface area (ECSA) of 18 electrocatalysts for the hydrogen evolution reaction (HER) and 26 electrocatalysts for the oxygen evolution reaction (OER) under conditions relevant to an integrated solar water-splitting device in aqueous acidic or alkaline solution. Our primary figure of merit is the overpotential necessary to achieve a magnitude current density of 10 mA cm^(–2) per geometric area, the approximate current density expected for a 10% efficient solar-to-fuels conversion device under 1 sun illumination. The specific activity per ECSA of each material is also reported. Among HER catalysts, several could operate at 10 mA cm^(–2) with overpotentials <0.1 V in acidic and/or alkaline solutions. Among OER catalysts in acidic solution, no non-noble metal based materials showed promising activity and stability, whereas in alkaline solution many OER catalysts performed with similar activity achieving 10 mA cm–2 current densities at overpotentials of ∼0.33–0.5 V. Most OER catalysts showed comparable or better specific activity per ECSA when compared to Ir and Ru catalysts in alkaline solutions, while most HER catalysts showed much lower specific activity than Pt in both acidic and alkaline solutions. For select catalysts, additional secondary screening measurements were conducted including Faradaic efficiency and extended stability measurements.

Item Type:Article
Related URLs:
URLURL TypeDescription Information
McCrory, Charles C. L.0000-0001-9039-7192
Jung, Suho0000-0002-8119-3902
Chatman, Shawn M.0000-0002-7951-5968
Peters, Jonas C.0000-0002-6610-4414
Jaramillo, Thomas F.0000-0001-9900-0622
Additional Information:© 2015 American Chemical Society. Received: October 10, 2014. Publication Date (Web): February 10, 2015. 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 Number DE-SC0004993. We thank Joel Haber for providing the NiFeCoCe-(a) and NiFeCoCe-(b) samples and Jesus M. Velazquez for his help in preparing the sputtered Ir and Ru-(b) samples. We also thank Slobodan Mitrovic, Natalie Becerra, and Fadl Saadi for their help with the collection of XPS data. In addition, we acknowledge many useful discussions with Nathan S. Lewis and Carl A. Koval.
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0004993
Issue or Number:13
Record Number:CaltechAUTHORS:20150331-092334778
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Official Citation:Benchmarking Hydrogen Evolving Reaction and Oxygen Evolving Reaction Electrocatalysts for Solar Water Splitting Devices Charles C. L. McCrory, Suho Jung, Ivonne M. Ferrer, Shawn M. Chatman, Jonas C. Peters, and Thomas F. Jaramillo Journal of the American Chemical Society 2015 137 (13), 4347-4357 DOI: 10.1021/ja510442p
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:56238
Deposited By: Tony Diaz
Deposited On:31 Mar 2015 18:14
Last Modified:10 Nov 2021 20:56

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