Energetic basis of catalytic activity of layered nanophase calcium manganese oxides for water oxidation

Nancy Birkner, Sara Nayeri, Babak Pashaei, Mohammad Mahdi Najafpour, William H. Casey, Alexandra Navrotsky

Research output: Contribution to journalArticlepeer-review

78 Scopus citations

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 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.

Original languageEnglish (US)
Pages (from-to)8801-8806
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume110
Issue number22
DOIs
StatePublished - May 28 2013
Externally publishedYes

Keywords

  • Nanomaterials
  • Thermochemistry

ASJC Scopus subject areas

  • General

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