In-situ Mössbauer effect spectroscopy of a model iron perovskite electrocatalyst

C. FIERRO; R. E. CARBONIO; D. SCHERSON; E. B. YEAGER

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 1988 vol. 33 p. 941 - 941

p style="TEXT-ALIGN: justify; LINE-HEIGHT: normal; MARGIN: 0cm 0cm 0pt; TEXT-AUTOSPACE: ; mso-layout-grid-align: none" class="MsoNormal">The electrochemical properties of SrFeO2.91 dispersed on a high area carbon in alkaline media have been investigated by cyclic vohammetry and in situ Mossbauer spectroscopy. The results provide evidence that a fraction of Fe(IV) sites, as monitored in situ, undergo a gradual and irreversible decrease upon exposure of the material to an alkaline solution. This has been attributed to the reduction of such oxidized sites by water, generating most likely an hydroxylated ferric species. In addition it