Citation: Yan Jun He, Xian Feng Chang, Xue Liang Dong, Chun Zhang, Wan Qin Jin, Nan Ping Xu. Effect of dopant valence on the oxygen desorption and oxygen permeability of SrCo_0.4Fe_0.5M_0.1O_3-δ(M=Ni, A1 and Zr) mixed-conducting oxides[J]. Chinese Chemical Letters, ;2008, 19(6): 725-729. doi: 10.1016/j.cclet.2008.03.003 shu

Effect of dopant valence on the oxygen desorption and oxygen permeability of SrCo_0.4Fe_0.5M_0.1O_3-δ(M=Ni, A1 and Zr) mixed-conducting oxides

State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing 210009, China

Received Date: 5 November 2007

Fund Project: This work is sponsored by the National Basic Research Program of China (No. 2003CB615702)National Natural Science Foundation of China (No. 2057605120636020)and Special Research Foundation for Doctoral Discipline of Higher Education (No. 20060291003).

The effect of dopant valence on oxygen desorption and oxygen permeability of SrCo_0.4Fe_0.5M0.1O_3-δ(M=Ni, Al and Zr) mixed-conducting oxides were investigated in detail by O₂-TPD and oxygen permeation measurement. The SrCo_0.4Fe_0.5M0.1O_3-δ for M=Fe, Ni, AI and Zr were denoted as SCF, SCFN, SCFA and SCFZ, respectively. O₂-TPD analysis revealed that the amount of α oxygen desorption decreased with increasing the valance of doped metal elements (SCFN > SCFA≈SCF > SCFZ). The oxygen permeation flux at the temperature higher than 1148 K decreased in the order of SCFN > SCF > SCFZ > SCFA. Single activation for oxygen permeation was observed for SCFZ oxide and the activation energies of SCF and SCFA change at around 1073K, while the change temperature of SCFN was about 1173K.
- Valence,
- Mixed-conducting oxide,
- Oxygen desorption,
- Oxygen permeability
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