Favaro, Marco and Drisdell, Walter S. and Marcus, Matthew A. and Gregoire, John M. and Crumlin, Ethan J. and Haber, Joel A. and Yano, Junko (2017) An Operando Investigation of (Ni-Fe-Co-Ce)O_x System as Highly Efficient Electrocatalyst for Oxygen Evolution Reaction. ACS Catalysis, 7 (2). pp. 1248-1258. ISSN 2155-5435. doi:10.1021/acscatal.6b03126. https://resolver.caltech.edu/CaltechAUTHORS:20170104-105146889
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Abstract
The oxygen evolution reaction (OER) is a critical component of industrial processes such as electrowinning of metals and the chlor-alkali process. It also plays a central role in the developing renewable energy field of solar-fuels generation by providing both the protons and electrons needed to generate fuels such as H_2 or reduced hydrocarbons from CO_2. To improve these processes, it is necessary to expand the fundamental understanding of catalytically active species at low overpotential, which will further the development of novel electrocatalysts with high activity and durability. In this context, performing experimental investigations of the electrocatalysts under realistic working regimes, i.e. under operando conditions, is of crucial importance. Here, we study a highly active quinary transition metal oxide-based OER electrocatalyst by means of operando ambient pressure X-ray photoelectron spectroscopy and X-ray absorption spectroscopy performed at the solid/liquid interface. We observe that the catalyst undergoes a clear chemical-structural evolution as a function of the applied potential with Ni, Fe and Co oxy-hydroxides comprising the active catalytic species. While CeO_2 is redox inactive under catalytic conditions, its influence on the redox processes of the transition metals boosts the catalytic activity at low overpotentials, introducing an important design principle for the optimization of electrocatalysts and tailoring of novel materials.
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Additional Information: | © 2016 American Chemical Society. Publication Date (Web): December 27, 2016. We thank Dan Guevarra for his assistance collecting the cyclic voltamograms shown in Figure 1, using the scanning drop electrochemical cell. 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 (Award No. DE-SC0004993). The XAS work was done at BL 10.3.2 at the Advanced Light Source, and at BL 7-3 at the Stanford Synchrotron Radiation Lightsource. The AP-XPS work was done at BL 9.3.1 at the Advanced Light Source. Use of the Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515. The Advanced Light Source is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. These two authors equally contributed to the work (M.F. and W.S.D.). The authors declare no competing financial interest. | ||||||||||||
Group: | JCAP | ||||||||||||
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Subject Keywords: | Oxygen evolution reaction (OER), transiton metal oxides, operando techniques, ambient pressure, catalytic conditions, synchrotron radiation, electron spectroscopies | ||||||||||||
Issue or Number: | 2 | ||||||||||||
DOI: | 10.1021/acscatal.6b03126 | ||||||||||||
Record Number: | CaltechAUTHORS:20170104-105146889 | ||||||||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20170104-105146889 | ||||||||||||
Official Citation: | An Operando Investigation of (Ni–Fe–Co–Ce)Ox System as Highly Efficient Electrocatalyst for Oxygen Evolution Reaction Marco Favaro, Walter S. Drisdell, Matthew A. Marcus, John M. Gregoire, Ethan J. Crumlin, Joel A. Haber, and Junko Yano ACS Catalysis 2017 7 (2), 1248-1258 DOI: 10.1021/acscatal.6b03126 | ||||||||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||
ID Code: | 73203 | ||||||||||||
Collection: | CaltechAUTHORS | ||||||||||||
Deposited By: | Tony Diaz | ||||||||||||
Deposited On: | 04 Jan 2017 19:00 | ||||||||||||
Last Modified: | 11 Nov 2021 05:12 |
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