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Tuning the Energy Band Structure at Interfaces of the SrFe0.75Ti0.25O3-delta-Sm0.25Ce0.75O2-delta Heterostructure for Fast Ionic Transport
Hubei Univ, Fac Phys & Elect Sci, Wuhan 430062, Hubei, Peoples R China..
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology. Hubei Univ, Fac Phys & Elect Sci, Wuhan 430062, Hubei, Peoples R China..ORCID iD: 0000-0002-3133-7031
Hubei Univ, Fac Phys & Elect Sci, Wuhan 430062, Hubei, Peoples R China..
Hubei Univ, Fac Phys & Elect Sci, Wuhan 430062, Hubei, Peoples R China..
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2019 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 11, no 42, p. 38737-38745Article in journal (Refereed) Published
Abstract [en]

Interface engineering holds huge potential for enabling exceptional physical properties in heterostructure materials via tuning properties at the atomic level. In this study, a heterostructure built by a new redox stable semiconductor SrFe0.75Ti0.25O3-delta (SFT) and an ionic conductor Sm0.25Ce0.75O2 (SDC) is reported. The SFT-SDC heterostructure exhibits a high ionic conductivity >0.1 S/cm at 520 degrees C, which is 1 order of magnitude higher than that of bulk SDC. When it was applied into the fuel cell, the SFT-SDC can realize favorable electrolyte functionality and result in an excellent power density of 920 mW cm(-2) at 520 degrees C. The prepared SFT-SDC heterostructure materials possess both electronic and ionic conduction, where electron states modulate local electrical field to facilitate ion transport. Further investigations to calculate the structure and electronic structure/state of SFT and SDC are done using density functional theory (DFT). It is found that the reconstruction of the energy band at interfaces is responsible for such enhanced ionic conductivity and cell power output. The current study about the perovskite-based heterostructure presents a novel strategy for developing advanced ceramic fuel cells.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2019. Vol. 11, no 42, p. 38737-38745
Keywords [en]
heterostructure, SrFe0.75Ti0.25O3-delta-Sm0.25Ce0.75O2-delta (SFT-SDC), ionic conduction, band structure, built-in field
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-264171DOI: 10.1021/acsami.9b13044ISI: 000492802100039PubMedID: 31592677Scopus ID: 2-s2.0-85073061539OAI: oai:DiVA.org:kth-264171DiVA, id: diva2:1374170
Note

QC 20191129

Available from: 2019-11-29 Created: 2019-11-29 Last updated: 2019-11-29Bibliographically approved

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Xia, ChenAfzal, Muhammad

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