Investigation of Iron Oxide Morphology in a Cyclic Redox Water Splitting Process for Hydrogen Generation
| Autor: | Michael M. Bobek, David W. Hahn, Richard C. Stehle |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Materials science
magnetite solar fuels Inorganic chemistry Iron oxide Oxide Redox water splitting lcsh:Technology Article EDS chemistry.chemical_compound Zinc–zinc oxide cycle General Materials Science lcsh:Microscopy Hydrogen production lcsh:QC120-168.85 lcsh:QH201-278.5 lcsh:T chemistry steam-iron process lcsh:TA1-2040 SEM Water splitting Atomic ratio lcsh:Descriptive and experimental mechanics lcsh:Electrical engineering. Electronics. Nuclear engineering Iron oxide cycle lcsh:Engineering (General). Civil engineering (General) lcsh:TK1-9971 |
| Zdroj: | Materials, Vol 5, Iss 10, Pp 2003-2014 (2012) Materials Volume 5 Issue 10 Pages 2003-2014 |
| ISSN: | 1996-1944 |
| Popis: | A solar fuels generation research program is focused on hydrogen production by means of reactive metal water splitting in a cyclic iron-based redox process. Iron-based oxides are explored as an intermediary reactive material to dissociate water molecules at significantly reduced thermal energies. With a goal of studying the resulting oxide chemistry and morphology, chemical assistance via CO is used to complete the redox cycle. In order to exploit the unique characteristics of highly reactive materials at the solar reactor scale, a monolithic laboratory scale reactor has been designed to explore the redox cycle at temperatures ranging from 675 to 875 K. Using high resolution scanning electron microscope (SEM) and electron dispersive X-ray spectroscopy (EDS), the oxide morphology and the oxide state are quantified, including spatial distributions. These images show the change of the oxide layers directly after oxidation and after reduction. The findings show a significant non-stoichiometric O/Fe gradient in the atomic ratio following oxidation, which is consistent with a previous kinetics model, and a relatively constant, non-stoichiometric O/Fe atomic ratio following reduction. |
| Databáze: | OpenAIRE |
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