Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 110, Issue 22, Pages 8801-8806Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1306623110
Keywords
nanomaterials; thermochemistry
Categories
Funding
- US Department of Energy [DE-FG02-97ER14749]
- Institute for Advanced Studies in Basic Sciences
- National Elite Foundation
- National Science Foundation [EAR-1231322]
- U.S. Department of Energy (DOE) [DE-FG02-97ER14749] Funding Source: U.S. Department of Energy (DOE)
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Previous measurements show that calcium manganese oxide nanoparticles are better water oxidation catalysts than binary manganese oxides (Mn3O4, Mn2O3, and MnO2). The probable reasons for such enhancement involve a combination of factors: The calcium manganese oxide materials have a layered structure with considerable thermodynamic stability and a high surface area, their low surface energy suggests relatively loose binding of H2O on the internal and external surfaces, and they possess mixed-valent manganese with internal oxidation enthalpy independent of the Mn3+/Mn4+ ratio and much smaller in magnitude than the Mn2O3-MnO2 couple. These factors enhance catalytic ability by providing easy access for solutes and water to active sites and facile electron transfer between manganese in different oxidation states.
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