authors |
Ivanova, YA; Monteiro, JF; Teixeira, LB; Vitorino, N; Kovalevsky, AV; Frade, JR |
nationality |
International |
journal |
MATERIALS & DESIGN |
author keywords |
Cellular ceramics; Porosity; Cathodic reduction; Hematite; Ceramic cathode |
keywords |
PARAFFIN EMULSIFIED SUSPENSIONS; CELLULAR CERAMICS; CATHODIC REDUCTION; ALKALINE-SOLUTION; PASSIVE FILMS; IRON; PARTICLES; MAGNETITE; TEMPERATURES; ELECTROLYSIS |
abstract |
This work proposes a new approach for electrochemical reduction of hematite to magnetite and/or metallic iron, based on ceramic cathodes with designed microstructures. The processing method, involving emulsification of concentrated aqueous ceramic suspensions with melted paraffin, enables preparation of cellular hematite ceramics possessing open porosity and pore interconnectivity controlled by simple process parameters. The obtained porous hematite ceramics were successfully used as cathodes for in situ electrochemical reduction in aqueous alkaline electrolyte. Electrochemical reduction converts the designed ceramic microstructure to corresponding cellular Fe/Fe(3)0(4)/Fe(2)0(3) composites with adjustable phase distributions and high prospects for applications in heterogeneous catalysis or other applications, based on unique combinations of active functionalities of metallic Fe, magnetite and hematite. (C) 2017 Elsevier Ltd. All rights reserved. |
publisher |
ELSEVIER SCI LTD |
issn |
0264-1275 |
isbn |
1873-4197 |
year published |
2017 |
volume |
122 |
beginning page |
307 |
ending page |
314 |
digital object identifier (doi) |
10.1016/j.matdes.2017.03.031 |
web of science category |
Materials Science, Multidisciplinary |
subject category |
Materials Science |
unique article identifier |
WOS:000400213200029
|