Energetic basis of catalytic activity of layered nanophase calcium manganese oxides for water oxidation.
Proc Natl Acad Sci U S A
; 110(22): 8801-6, 2013 May 28.
Article
em En
| MEDLINE
| ID: mdl-23667149
ABSTRACT
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 Mn(3+)/Mn(4+) 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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Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Óxidos
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Água
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Compostos de Manganês
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Compostos de Cálcio
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Nanopartículas
Idioma:
En
Ano de publicação:
2013
Tipo de documento:
Article