Synergistic electron doping and ion conductive phase incorporating of SrCoO3-δ as desirable cathode materials for intermediate-temperature solid oxide fuel cells

Liu，Jincheng1; Jin，Fangjun1,2; Yang，Xin1,3; Niu，Bingbing1,4; Yu，Shenglong1; Li，Yongfeng1; He，Tianmin1

2020-12-15

10.1016/j.ceramint.2020.07.337

CERAMICS INTERNATIONAL   影响因子和分区

0272-8842

1873-3956

Mixed conducting perovskite-structured oxides are desirable catalysts toward the oxygen reduction reaction (ORR) process. Pure cubic perovskite-structured SrCoO is a promising class of mixed conductors with high ORR activity. However, it suffers from structural instability and thermal incompatibility at elevated temperatures, thereby impeding its practical application in intermediate-temperature solid oxide fuel cells (IT-SOFCs). In this work, A-site electron doping in SrCoO was conducted to chemically compensate for the loss of lattice oxygen, thus improving the structural stability of SrCoO. Among the as-prepared Y-doped SrYCoO (x = 0.05–0.20) samples, 10 mol% Y-doping of SrYCoO (SYC10) experimentally exhibits desirable electrical conductivity and lowest area specific resistance (ASR) while maintaining structural stability at elevated temperatures. The results are confirmed by first-principles calculations that involve density of states and oxygen vacancy formation energy. In addition, GdCeO incorporation further improves the thermal compatibility and cell performance, where the measured thermal expansion coefficients between 30 °C and 1000 °C decrease from 23.3 × 10 K for SYC10 to 19.0 × 10 K for SYC10–40GDC, and the corresponding ASRs with LaSrGaMgO electrolyte decrease from 0.080 Ω cm to 0.044 Ω cm at 700 °C. Results suggest that SYC10–40GDC is a desirable cathode material for IT-SOFCs.

Cathode Cell performance First-principles calculations Solid oxide fuel cells Structural stability Thermal compatibility

SCI ; EI

英语

其他

Natural Science Foundation of China[91745203] ; Jilin Province Science and Technology Department[20180101073JC]

Materials Science

Materials Science, Ceramics

WOS:000582503700047

ELSEVIER SCI LTD

20203409062659

Oxygen vacancies ; Thermal expansion ; Stability ; Perovskite ; Calculations ; Electrolytes ; Strontium compounds ; Oxygen ; Solid oxide fuel cells (SOFC) ; Electrolytic reduction

Minerals:482.2 ; Ore Treatment:533.1 ; Thermodynamics:641.1 ; Electric Batteries and Fuel Cells:702 ; Fuel Cells:702.2 ; Chemical Reactions:802.2 ; Chemical Agents and Basic Industrial Chemicals:803 ; Chemical Products Generally:804 ; Mathematics:921 ; Crystalline Solids:933.1 ; Materials Science:951

MATERIALS SCIENCE

2-s2.0-85089447413

Scopus

1.Key Laboratory of Physics and Technology for Advanced Batteries,Ministry of Education,College of Physics,Jilin University,Changchun,130012,China
2.School of Science,Changchun University of Science and Technology,Changchun,130022,China
3.Department of Mechanical Eengineering,University of South Carolina,Columbia,300 Main Street,29208,United States
4.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Liu，Jincheng,Jin，Fangjun,Yang，Xin,et al. Synergistic electron doping and ion conductive phase incorporating of SrCoO3-δ as desirable cathode materials for intermediate-temperature solid oxide fuel cells[J]. CERAMICS INTERNATIONAL,2020,46(18):28332-28341.

Liu，Jincheng.,Jin，Fangjun.,Yang，Xin.,Niu，Bingbing.,Yu，Shenglong.,...&He，Tianmin.(2020).Synergistic electron doping and ion conductive phase incorporating of SrCoO3-δ as desirable cathode materials for intermediate-temperature solid oxide fuel cells.CERAMICS INTERNATIONAL,46(18),28332-28341.

Liu，Jincheng,et al."Synergistic electron doping and ion conductive phase incorporating of SrCoO3-δ as desirable cathode materials for intermediate-temperature solid oxide fuel cells".CERAMICS INTERNATIONAL 46.18(2020):28332-28341.