resumo
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.
palavras-chave
PARAFFIN EMULSIFIED SUSPENSIONS; CELLULAR CERAMICS; CATHODIC REDUCTION; ALKALINE-SOLUTION; PASSIVE FILMS; IRON; PARTICLES; MAGNETITE; TEMPERATURES; ELECTROLYSIS
categoria
Materials Science
autores
Ivanova, YA; Monteiro, JF; Teixeira, LB; Vitorino, N; Kovalevsky, AV; Frade, JR
nossos autores
Andrei Kavaleuski
Investigador principal
Jorge Ribeiro Frade
Professor(a) Jubilado(a)
José Filipe Pinto Monteiro
Estudante de doutoramento
Nuno Miguel Dias Vitorino
Bolseiro de pós-Doutoramento
Yuliya Ivanova
Bolseiro de pós-DoutoramentoProjectos
IERO-Iron production by Electrochemical Reduction of its Oxide for high CO2 mitigation (IERO)
agradecimentos
This work was supported by the European Unions Research Fund for Coal and Steel (RFCS) research program [grant RFSR-CT-2010-00002], FCT Investigator program [grant IF/00302/2012], project CICECO-Aveiro Institute of Materials [grant UID/CTM/50011/2013], financed by COMPETE 2020 Program and National Funds through the FCT/MEC and when applicable co-financed by FEDER under the PT2020 Partnership Agreement, and by the Foundation for Science and Technology (FCT), Portugal [grant SFRH/BD/68290/2010 and PEst-C/CTM/LA0011/2013].