Tuning the Energy Band Structure at Interfaces of the SrFe0.75Ti0.25O3-delta-Sm0.25Ce0.75O2-delta Heterostructure for Fast Ionic Transport

Mushtaq, NaveedHubei Univ, Fac Phys & Elect Sci, Wuhan 430062, Hubei, Peoples R China. (author)

QC 20191129
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.

Xia, ChenKTH,Kraft- och värmeteknologi,Hubei Univ, Fac Phys & Elect Sci, Wuhan 430062, Hubei, Peoples R China.(Swepub:kth)u158xmoe (author)
Dong, WenjingHubei Univ, Fac Phys & Elect Sci, Wuhan 430062, Hubei, Peoples R China. (author)
Wang, BaoyuanHubei Univ, Fac Phys & Elect Sci, Wuhan 430062, Hubei, Peoples R China. (author)
Raza, RizwanCOMSATS Univ Islamabad, Dept Phys, CERL, Lahore Campus, Lahore 54000, Pakistan. (author)
Ali, AmjadCOMSATS Univ Islamabad, Dept Phys, CERL, Lahore Campus, Lahore 54000, Pakistan. (author)
Afzal, MuhammadKTH,Kraft- och värmeteknologi(Swepub:kth)u18047fk (author)
Zhu, BinHubei Univ, Fac Phys & Elect Sci, Wuhan 430062, Hubei, Peoples R China.;China Univ Geosci, Dept Mat Sci & Chem, Minist Educ, Engn Res Ctr Nanogeo Mat, 388 Lumo Rd, Wuhan 430074, Hubei, Peoples R China.;Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China. (author)
Hubei Univ, Fac Phys & Elect Sci, Wuhan 430062, Hubei, Peoples R China.Kraft- och värmeteknologi (creator_code:org_t)

In:ACS Applied Materials and Interfaces: AMER CHEMICAL SOC11:42, s. 38737-387451944-82441944-8252

By the author/editor: Mushtaq, Naveed; Xia, Chen; Dong, Wenjing; Wang, Baoyuan; Raza, Rizwan; Ali, Amjad; show more...; Afzal, Muhammad; Zhu, Bin; show less...

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