In Situ Exsolution of Sr0.95Sc0.175Nb0.025Co0.8O3-δ-Ag0 Composite Cathode for Proton-Conducting Solid Oxide Fuel Cell

被引：0
|
作者：
Yang W. [1 ]
Yang H. [1 ]
Jiang S. [2 ]
Hong T. [3 ]
Guo Y. [1 ]
机构：
[1] School of Materials Science and Engineering, Anhui University, Hefei
[2] School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang
[3] School of Materials Science and Engineering, Hefei University of Technology, Hefei
来源：
Xiyou Jinshu/Chinese Journal of Rare Metals | 2023年 / 47卷 / 01期
关键词：
in situ ex-solution; oxygen reduction reaction（ORR）; proton conductor; solid oxide fuel cell;
D O I：
10.13373/j.cnki.cjrm.XY22070014
中图分类号：
学科分类号：
摘要：
With the aggravation of global warming trend，people have formed a consensus on the use of clean energy，and the demand is increasingly urgent and vigorous. Solid oxide fuel cell（SOFC）is an efficient，environmentally friendly and mature technology to directly convert hydrogen energy into electric energy. Proton-conducting solid oxide fuel cells（H+-SOFCs）can operate at medium and low temperature（400~600 ℃），producing water at the cathode. Until now，H+-SOFC has two problems：（1）Poor stability limited by the lack of active sites for cathodic oxygen reduction reaction（ORR）.（2）The catalytic activity of cathode material for ORR reaction is insufficient. In this paper，Ag0.05Sr0.95Sc0.175Nb0.025Co0.8O3-δ（S0.95SNC-Ag+）perovskite oxide was prepared by sol-gel method. The composite cathode of Sr0.95Sc0.175Nb0.025Co0.8O3-δ loaded Ag0 （S0.95SNC-Ag0） was obtained through in situ exsolution S0.95SNC-Ag+ in 1%H2O-O2（volume fraction）atmosphere at 600 ℃ . The solid electrolyte BaZr0.1Ce0.7Y0.2O3-δ（BZCY）was prepared using the same method. The transformation of crystal structure，the changes of electrical conductivity，element valence and other properties before and after in situ exsolution were investigated by X-ray diffraction（XRD），direct current four-terminal method and X-ray photoelectron spectroscopy（XPS）. S0.95SNC-Ag0/BZCY/S0.95SNC-Ag0 symmetrical cell and S0.95SNC-Ag0/BZCY/NiO+BZCY single cell were fabricated and their electrochemical properties were investigated. The symmetrical cell was passed through 1%H2O-O2 atmosphere for 16 h to explore the effect of in situ exsolution on the polarization process of S0.95SNC-Ag0 cathode. The current density of 625 mW·cm-2 was maintained at both ends of the single cell for 16 h for in-situ exsolution occurred in the cathode，and the variation of working voltage of the single cell was tested. Then current-voltage（I-V）curve of the single cell was tested again. The cross section of single cell and energy dispersive X-ray spectroscopy（EDS）-mapping of S0.95SNC-Ag0 were captured by scanning electron microscope（SEM）. The interplanar spacing of Ag0 nanoparticles was obtained by high-resolution transmission microscope（HRTEM）images. XRD results showed that S0.95SNC-Ag+ presented a perovskite structure. XPS results showed that Ag 3d peak of S0.95SNC-Ag0 was shifted to a larger binding energy than that of S0.95SNC-Ag+. This indicated that Ag0 appeared after in situ exsolution treatment. The thermal expansion coefficient of S0.95SNC-Ag+ was smaller than that of SrSc0.175Nb0.025Co0.8O3-δ（SSNC），indicating that S0.95SNC-Ag+ had better thermal matching with BZCY than that of SSNC. The results of the conductivity test demonstrated that S0.95SNC-Ag+ had a greater conductivity than SSNC under ordinary air conditions. With the prolongation of the in situ exsolution time，the conductivity of S0.95SNC-Ag0 increased gradually. The test results of symmetric cells presented that in situ exsolution reduced the impedance resistance of the oxygen adsorption and dissociation step on the cathode，but not for the gas diffusion step. And the ohmic impedance of S0.95SNC-Ag0 cathode was significantly smaller than that of SSNC cathode with the same electrolyte，suggesting that S0.95SNC-Ag0 would have a higher power density. The single-cell test results showed the single cell with S0.95SNC-Ag0 as the cathode delivered a higher powder density than that with SSNC as cathode. With the prolongation of the in situ exsolution time，the working voltage of the single cell continued to increase，and the power density of S0.95SNC-Ag0/BZCY/NiO+BZCY single cell increased from 332 to 351 mW·cm-2 at 600 ℃. These results demonstrated that in situ exsolution was a powerful technique to prepare a composite cathode of perovskite loaded metal nanoparticles，and the prepared S0.95SNCAg0was a potential cathode for H+SOFC. © 2023 Editorial Office of Chinese Journal of Rare Metals. All rights reserved.
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页码：156 / 166
页数：10
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