Oxygen Evolution Activity and Stability of Ba6Mn5O16, Sr4Mn2CoO9, and Sr6Co5O15: The Influence of Transition Metal Coordination

Several coordination motifs of cobalt and manganese ions were obtained in various transition metal oxides, which enabled different oxidation and spin states. Combined high-resolution transmission electron microscopy (HRTEM) and X-ray absorption spectroscopy (XAS) confirmed the presence of coordinati...

Full description

Saved in:
Bibliographic Details
Published inJournal of physical chemistry. C Vol. 117; no. 49; pp. 25926 - 25932
Main Authors Grimaud, Alexis, Carlton, Christopher E, Risch, Marcel, Hong, Wesley T, May, Kevin J, Shao-Horn, Yang
Format Journal Article
LanguageEnglish
Published Columbus, OH American Chemical Society 12.12.2013
Subjects
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electron states
Exact sciences and technology
Metal-insulator transitions and other electronic transitions
Physics
Electronic structure
Transmission electron microscopy
Valence
X-ray absorption spectra
Cobalt Lanthanum Oxides Mixed
Transition elements
Perovskites
Electronic transition
Cobalt
Spin state
Manganese
Online AccessGet full text

Cover

More Information
Summary:Several coordination motifs of cobalt and manganese ions were obtained in various transition metal oxides, which enabled different oxidation and spin states. Combined high-resolution transmission electron microscopy (HRTEM) and X-ray absorption spectroscopy (XAS) confirmed the presence of coordination environments such as Co2+ in disordered prisms and Co4+/Mn4+ in face-shared octahedra. The influence of cobalt and manganese coordination on the oxygen evolution reaction (OER) activity and oxide stability in alkaline solution was studied. Under cycling, the surface of perovskites that consists of Co2+ in prisms was amorphized and the activity was similar to that of LaCoO3, which has a stable surface composed of Co3+ in octahedral coordination. These findings highlight the critical role of the electronic structure of transition metal oxides on the OER activity and stability.
ISSN:1932-7447
1932-7455
DOI:10.1021/jp408585z