Theoretical Investigation of the Activity of Cobalt Oxides for the Electrochemical Oxidation of Water
Abstract
The presence of layered cobalt oxides has been identified experimentally in Co-based anodes under oxygen-evolving conditions. In this work, we report the results of theoretical investigations of the relative stability of layered and spinel bulk phases of Co oxides, as well as the stability of selected surfaces as a function of applied potential and pH. We then study the oxygen evolution reaction (OER) on these surfaces and obtain activity trends at experimentally relevant electro-chemical conditions. Our calculated volume Pourbaix diagram shows that β-CoOOH is the active phase where the OER occurs in alkaline media. We calculate relative surface stabilities and adsorbate coverages of the most stable low-index surfaces of β-CoOOH: (0001), ($$01\bar{12}$$), and ($$10\bar{14}$$). We find that at low applied potentials, the ($$10\bar{14}$$) surface is the most stable, while the ($$01\bar{12}$$) surface is the more stable at higher potentials. Next, we compare the theoretical overpotentials for all three surfaces and find that the ($$10\bar{14}$$) surface is the most active one as characteried by an overpotential of η = 0.48 V. The high activity of the ($$10\bar{14}$$) surface can be attributed to the observation that the resting state of Co in the active site is Co3+ during the OER, whereas Co is in the Co4+ state in the less active surfaces. Lastly, we demonstrate that the overpotential of the ($$10\bar{14}$$) surface can be lowered further by surface substitution of Co by Ni. This finding could explain the experimentally observed enhancement in the OER activity of NiyCo1-yOx thin films with increasing Ni content. All energetics in this work were obtained from density functional theory using the Hubbard-U correction.
- Authors:
-
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
- Stanford Univ., Stanford, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Chemical Sciences, Geosciences & Biosciences Division (SC-22.1)
- OSTI Identifier:
- 1511371
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of the American Chemical Society
- Additional Journal Information:
- Journal Volume: 135; Journal Issue: 36; Journal ID: ISSN 0002-7863
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; adsorption; free energy; oxides; radiology; surface energy
Citation Formats
Bajdich, Michal, García-Mota, Mónica, Vojvodic, Aleksandra, Nørskov, Jens K., and Bell, Alexis T. Theoretical Investigation of the Activity of Cobalt Oxides for the Electrochemical Oxidation of Water. United States: N. p., 2013.
Web. doi:10.1021/ja405997s.
Bajdich, Michal, García-Mota, Mónica, Vojvodic, Aleksandra, Nørskov, Jens K., & Bell, Alexis T. Theoretical Investigation of the Activity of Cobalt Oxides for the Electrochemical Oxidation of Water. United States. https://doi.org/10.1021/ja405997s
Bajdich, Michal, García-Mota, Mónica, Vojvodic, Aleksandra, Nørskov, Jens K., and Bell, Alexis T. Wed .
"Theoretical Investigation of the Activity of Cobalt Oxides for the Electrochemical Oxidation of Water". United States. https://doi.org/10.1021/ja405997s. https://www.osti.gov/servlets/purl/1511371.
@article{osti_1511371,
title = {Theoretical Investigation of the Activity of Cobalt Oxides for the Electrochemical Oxidation of Water},
author = {Bajdich, Michal and García-Mota, Mónica and Vojvodic, Aleksandra and Nørskov, Jens K. and Bell, Alexis T.},
abstractNote = {The presence of layered cobalt oxides has been identified experimentally in Co-based anodes under oxygen-evolving conditions. In this work, we report the results of theoretical investigations of the relative stability of layered and spinel bulk phases of Co oxides, as well as the stability of selected surfaces as a function of applied potential and pH. We then study the oxygen evolution reaction (OER) on these surfaces and obtain activity trends at experimentally relevant electro-chemical conditions. Our calculated volume Pourbaix diagram shows that β-CoOOH is the active phase where the OER occurs in alkaline media. We calculate relative surface stabilities and adsorbate coverages of the most stable low-index surfaces of β-CoOOH: (0001), ($01\bar{12}$), and ($10\bar{14}$). We find that at low applied potentials, the ($10\bar{14}$) surface is the most stable, while the ($01\bar{12}$) surface is the more stable at higher potentials. Next, we compare the theoretical overpotentials for all three surfaces and find that the ($10\bar{14}$) surface is the most active one as characteried by an overpotential of η = 0.48 V. The high activity of the ($10\bar{14}$) surface can be attributed to the observation that the resting state of Co in the active site is Co3+ during the OER, whereas Co is in the Co4+ state in the less active surfaces. Lastly, we demonstrate that the overpotential of the ($10\bar{14}$) surface can be lowered further by surface substitution of Co by Ni. This finding could explain the experimentally observed enhancement in the OER activity of NiyCo1-yOx thin films with increasing Ni content. All energetics in this work were obtained from density functional theory using the Hubbard-U correction.},
doi = {10.1021/ja405997s},
journal = {Journal of the American Chemical Society},
number = 36,
volume = 135,
place = {United States},
year = {Wed Aug 14 00:00:00 EDT 2013},
month = {Wed Aug 14 00:00:00 EDT 2013}
}
Web of Science
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