TY - JOUR
T1 - Effects of pore morphology on the cyclical oxidation/reduction of iron foams created via camphene-based freeze casting
AU - Um, Teakyung
AU - Wilke, Stephen K.
AU - Choe, Heeman
AU - Dunand, David C.
N1 - Funding Information:
This research was supported by the National Science Foundation (NSF CMMI-1562941 ). HC acknowledges support from the Basic Science Research Program ( NRF-2018R1D1A1B07048390 ) through the National Research Foundation of Korea . The authors made use of the following Northwestern University (NU) resources: the Materials Characterization and Imaging Facility, the NUANCE Center (supported by SHyNE under NSF ECCS-1542205 , MRSEC under NSF DMR-1720139 , the International Institute for Nanotechnology , the Keck Foundation , and the State of Illinois ), and the Center for Advanced Molecular Imaging (supported by NCI CCSG P30 CA060553). Tomography experiments were performed at the DuPont-Northwestern-Dow Collaborative Access Team (DND-CAT), Sector 5 of the Advanced Photon Source, operated by Argonne National Laboratory (DOE DE-AC02-06CH11357). The authors gratefully acknowledge Drs. Denis Keane and William Guise (DND-CAT) for assistance in collecting and processing the tomography data, and Ms. Kristen Scotti (NU) for insightful discussions.
Funding Information:
This research was supported by the National Science Foundation (NSF CMMI-1562941). HC acknowledges support from the Basic Science Research Program (NRF-2018R1D1A1B07048390) through the National Research Foundation of Korea. The authors made use of the following Northwestern University (NU) resources: the Materials Characterization and Imaging Facility, the NUANCE Center (supported by SHyNE under NSF ECCS-1542205, MRSEC under NSF DMR-1720139, the International Institute for Nanotechnology, the Keck Foundation, and the State of Illinois), and the Center for Advanced Molecular Imaging (supported by NCI CCSG P30 CA060553). Tomography experiments were performed at the DuPont-Northwestern-Dow Collaborative Access Team (DND-CAT), Sector 5 of the Advanced Photon Source, operated by Argonne National Laboratory (DOE DE-AC02-06CH11357). The authors gratefully acknowledge Drs. Denis Keane and William Guise (DND-CAT) for assistance in collecting and processing the tomography data, and Ms. Kristen Scotti (NU) for insightful discussions.
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/12/10
Y1 - 2020/12/10
N2 - Solid-oxide iron-air batteries have potential for applications in large-scale energy storage systems, but their storage materials, iron and iron oxides, have limited cycle life due to powder sintering and choking of gas flow. To address this issue, Fe foams are synthesized with either equiaxed or directional dendritic pore structures by camphene-based freeze casting of Fe2O3 powders, followed by H2 reduction to Fe and sintering. For each pore architecture, Fe foams are created with three different initial porosities, ranging from 47 to 63 vol %, and are then cycled at 800 °C under alternating oxidation (via H2O) and reduction (via H2) conditions. The redox-cycled foams are examined by optical microscopy, scanning electron microscopy, and synchrotron X-ray tomography to assess the evolution of their porosity driven by the redox volume changes, sintering, and micropore formation via the Kirkendall effect. After 5 redox cycles, the Fe foams have lost the majority (39 ± 2 vol %) of their initial porosity.
AB - Solid-oxide iron-air batteries have potential for applications in large-scale energy storage systems, but their storage materials, iron and iron oxides, have limited cycle life due to powder sintering and choking of gas flow. To address this issue, Fe foams are synthesized with either equiaxed or directional dendritic pore structures by camphene-based freeze casting of Fe2O3 powders, followed by H2 reduction to Fe and sintering. For each pore architecture, Fe foams are created with three different initial porosities, ranging from 47 to 63 vol %, and are then cycled at 800 °C under alternating oxidation (via H2O) and reduction (via H2) conditions. The redox-cycled foams are examined by optical microscopy, scanning electron microscopy, and synchrotron X-ray tomography to assess the evolution of their porosity driven by the redox volume changes, sintering, and micropore formation via the Kirkendall effect. After 5 redox cycles, the Fe foams have lost the majority (39 ± 2 vol %) of their initial porosity.
KW - Chemical looping
KW - Dendritic pore structure
KW - Freeze-casting
KW - Iron foam
KW - Iron–air battery
UR - http://www.scopus.com/inward/record.url?scp=85088478538&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85088478538&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2020.156278
DO - 10.1016/j.jallcom.2020.156278
M3 - Article
AN - SCOPUS:85088478538
VL - 845
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
M1 - 156278
ER -