Water Oxidation Catalysis by Co(II) Impurities in Co(III)(4)O(4) Cubanes

[Image: see text] The observed water oxidation activity of the compound class Co(4)O(4)(OAc)(4)(Py–X)(4) emanates from a Co(II) impurity. This impurity is oxidized to produce the well-known Co-OEC heterogeneous cobaltate catalyst, which is an active water oxidation catalyst. We present results from...

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Autores principales: Ullman, Andrew M., Liu, Yi, Huynh, Michael, Bediako, D. Kwabena, Wang, Hongsen, Anderson, Bryce L., Powers, David C., Breen, John J., Abruña, Héctor D., Nocera, Daniel G.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2014
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4277775/
https://www.ncbi.nlm.nih.gov/pubmed/25407218
http://dx.doi.org/10.1021/ja5110393
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author Ullman, Andrew M.
Liu, Yi
Huynh, Michael
Bediako, D. Kwabena
Wang, Hongsen
Anderson, Bryce L.
Powers, David C.
Breen, John J.
Abruña, Héctor D.
Nocera, Daniel G.
author_facet Ullman, Andrew M.
Liu, Yi
Huynh, Michael
Bediako, D. Kwabena
Wang, Hongsen
Anderson, Bryce L.
Powers, David C.
Breen, John J.
Abruña, Héctor D.
Nocera, Daniel G.
author_sort Ullman, Andrew M.
collection PubMed
description [Image: see text] The observed water oxidation activity of the compound class Co(4)O(4)(OAc)(4)(Py–X)(4) emanates from a Co(II) impurity. This impurity is oxidized to produce the well-known Co-OEC heterogeneous cobaltate catalyst, which is an active water oxidation catalyst. We present results from electron paramagnetic resonance spectroscopy, nuclear magnetic resonance line broadening analysis, and electrochemical titrations to establish the existence of the Co(II) impurity as the major source of water oxidation activity that has been reported for Co(4)O(4) molecular cubanes. Differential electrochemical mass spectrometry is used to characterize the fate of glassy carbon at water oxidizing potentials and demonstrate that such electrode materials should be used with caution for the study of water oxidation catalysis.
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spelling pubmed-42777752015-11-18 Water Oxidation Catalysis by Co(II) Impurities in Co(III)(4)O(4) Cubanes Ullman, Andrew M. Liu, Yi Huynh, Michael Bediako, D. Kwabena Wang, Hongsen Anderson, Bryce L. Powers, David C. Breen, John J. Abruña, Héctor D. Nocera, Daniel G. J Am Chem Soc [Image: see text] The observed water oxidation activity of the compound class Co(4)O(4)(OAc)(4)(Py–X)(4) emanates from a Co(II) impurity. This impurity is oxidized to produce the well-known Co-OEC heterogeneous cobaltate catalyst, which is an active water oxidation catalyst. We present results from electron paramagnetic resonance spectroscopy, nuclear magnetic resonance line broadening analysis, and electrochemical titrations to establish the existence of the Co(II) impurity as the major source of water oxidation activity that has been reported for Co(4)O(4) molecular cubanes. Differential electrochemical mass spectrometry is used to characterize the fate of glassy carbon at water oxidizing potentials and demonstrate that such electrode materials should be used with caution for the study of water oxidation catalysis. American Chemical Society 2014-11-18 2014-12-17 /pmc/articles/PMC4277775/ /pubmed/25407218 http://dx.doi.org/10.1021/ja5110393 Text en Copyright © 2014 American Chemical Society This is an open access article published under an ACS AuthorChoice License (http://pubs.acs.org/page/policy/authorchoice_termsofuse.html) , which permits copying and redistribution of the article or any adaptations for non-commercial purposes.
spellingShingle Ullman, Andrew M.
Liu, Yi
Huynh, Michael
Bediako, D. Kwabena
Wang, Hongsen
Anderson, Bryce L.
Powers, David C.
Breen, John J.
Abruña, Héctor D.
Nocera, Daniel G.
Water Oxidation Catalysis by Co(II) Impurities in Co(III)(4)O(4) Cubanes
title Water Oxidation Catalysis by Co(II) Impurities in Co(III)(4)O(4) Cubanes
title_full Water Oxidation Catalysis by Co(II) Impurities in Co(III)(4)O(4) Cubanes
title_fullStr Water Oxidation Catalysis by Co(II) Impurities in Co(III)(4)O(4) Cubanes
title_full_unstemmed Water Oxidation Catalysis by Co(II) Impurities in Co(III)(4)O(4) Cubanes
title_short Water Oxidation Catalysis by Co(II) Impurities in Co(III)(4)O(4) Cubanes
title_sort water oxidation catalysis by co(ii) impurities in co(iii)(4)o(4) cubanes
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4277775/
https://www.ncbi.nlm.nih.gov/pubmed/25407218
http://dx.doi.org/10.1021/ja5110393
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