A Bulk-Heterostructure Nanocomposite Electrolyte of Ce0.8Sm0.2O2-δ–SrTiO3 for Low-Temperature Solid Oxide Fuel Cells
Abstract Since colossal ionic conductivity was detected in the planar heterostructures consisting of fluorite and perovskite, heterostructures have drawn great research interest as potential electrolytes for solid oxide fuel cells (SOFCs). However, so far, the practical uses of such promising materi...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2021-01-01
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| Series: | Nano-Micro Letters |
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| Online Access: | https://doi.org/10.1007/s40820-020-00574-3 |
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| author | Yixiao Cai Yang Chen Muhammad Akbar Bin Jin Zhengwen Tu Naveed Mushtaq Baoyuan Wang Xiangyang Qu Chen Xia Yizhong Huang |
| author_facet | Yixiao Cai Yang Chen Muhammad Akbar Bin Jin Zhengwen Tu Naveed Mushtaq Baoyuan Wang Xiangyang Qu Chen Xia Yizhong Huang |
| author_sort | Yixiao Cai |
| collection | DOAJ |
| description | Abstract Since colossal ionic conductivity was detected in the planar heterostructures consisting of fluorite and perovskite, heterostructures have drawn great research interest as potential electrolytes for solid oxide fuel cells (SOFCs). However, so far, the practical uses of such promising material have failed to materialize in SOFCs due to the short circuit risk caused by SrTiO3. In this study, a series of fluorite/perovskite heterostructures made of Sm-doped CeO2 and SrTiO3 (SDC–STO) are developed in a new bulk-heterostructure form and evaluated as electrolytes. The prepared cells exhibit a peak power density of 892 mW cm−2 along with open circuit voltage of 1.1 V at 550 °C for the optimal composition of 4SDC–6STO. Further electrical studies reveal a high ionic conductivity of 0.05–0.14 S cm−1 at 450–550 °C, which shows remarkable enhancement compared to that of simplex SDC. Via AC impedance analysis, it has been shown that the small grain-boundary and electrode polarization resistances play the major roles in resulting in the superior performance. Furthermore, a Schottky junction effect is proposed by considering the work functions and electronic affinities to interpret the avoidance of short circuit in the SDC–STO cell. Our findings thus indicate a new insight to design electrolytes for low-temperature SOFCs. |
| first_indexed | 2024-12-14T21:37:01Z |
| format | Article |
| id | doaj.art-04525b0422b04d9c856da90de10e146b |
| institution | Directory Open Access Journal |
| issn | 2311-6706 2150-5551 |
| language | English |
| last_indexed | 2024-12-14T21:37:01Z |
| publishDate | 2021-01-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Nano-Micro Letters |
| spelling | doaj.art-04525b0422b04d9c856da90de10e146b2022-12-21T22:46:33ZengSpringerOpenNano-Micro Letters2311-67062150-55512021-01-0113111410.1007/s40820-020-00574-3A Bulk-Heterostructure Nanocomposite Electrolyte of Ce0.8Sm0.2O2-δ–SrTiO3 for Low-Temperature Solid Oxide Fuel CellsYixiao Cai0Yang Chen1Muhammad Akbar2Bin Jin3Zhengwen Tu4Naveed Mushtaq5Baoyuan Wang6Xiangyang Qu7Chen Xia8Yizhong Huang9State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Key Laboratory of High Performance Fibers and Products, Engineering Research Center of Technical Textiles, Ministry of Education, College of Materials Science and Engineering, Donghua UniversityState Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Key Laboratory of High Performance Fibers and Products, Engineering Research Center of Technical Textiles, Ministry of Education, College of Materials Science and Engineering, Donghua UniversityKey Laboratory of Ferro and Piezoelectric Materials and Devices of Hubei Province, Faculty of Physics and Electronic Science, Hubei UniversityKey Laboratory of Ferro and Piezoelectric Materials and Devices of Hubei Province, Faculty of Physics and Electronic Science, Hubei UniversityKey Laboratory of Ferro and Piezoelectric Materials and Devices of Hubei Province, Faculty of Physics and Electronic Science, Hubei UniversityKey Laboratory of Ferro and Piezoelectric Materials and Devices of Hubei Province, Faculty of Physics and Electronic Science, Hubei UniversityKey Laboratory of Ferro and Piezoelectric Materials and Devices of Hubei Province, Faculty of Physics and Electronic Science, Hubei UniversityState Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Key Laboratory of High Performance Fibers and Products, Engineering Research Center of Technical Textiles, Ministry of Education, College of Materials Science and Engineering, Donghua UniversityKey Laboratory of Ferro and Piezoelectric Materials and Devices of Hubei Province, Faculty of Physics and Electronic Science, Hubei UniversitySchool of Materials Science and Engineering, Nanyang Technological UniversityAbstract Since colossal ionic conductivity was detected in the planar heterostructures consisting of fluorite and perovskite, heterostructures have drawn great research interest as potential electrolytes for solid oxide fuel cells (SOFCs). However, so far, the practical uses of such promising material have failed to materialize in SOFCs due to the short circuit risk caused by SrTiO3. In this study, a series of fluorite/perovskite heterostructures made of Sm-doped CeO2 and SrTiO3 (SDC–STO) are developed in a new bulk-heterostructure form and evaluated as electrolytes. The prepared cells exhibit a peak power density of 892 mW cm−2 along with open circuit voltage of 1.1 V at 550 °C for the optimal composition of 4SDC–6STO. Further electrical studies reveal a high ionic conductivity of 0.05–0.14 S cm−1 at 450–550 °C, which shows remarkable enhancement compared to that of simplex SDC. Via AC impedance analysis, it has been shown that the small grain-boundary and electrode polarization resistances play the major roles in resulting in the superior performance. Furthermore, a Schottky junction effect is proposed by considering the work functions and electronic affinities to interpret the avoidance of short circuit in the SDC–STO cell. Our findings thus indicate a new insight to design electrolytes for low-temperature SOFCs.https://doi.org/10.1007/s40820-020-00574-3Bulk-heterostructureSOFC electrolyteIonic conductivitySchottky junctionWork function |
| spellingShingle | Yixiao Cai Yang Chen Muhammad Akbar Bin Jin Zhengwen Tu Naveed Mushtaq Baoyuan Wang Xiangyang Qu Chen Xia Yizhong Huang A Bulk-Heterostructure Nanocomposite Electrolyte of Ce0.8Sm0.2O2-δ–SrTiO3 for Low-Temperature Solid Oxide Fuel Cells Nano-Micro Letters Bulk-heterostructure SOFC electrolyte Ionic conductivity Schottky junction Work function |
| title | A Bulk-Heterostructure Nanocomposite Electrolyte of Ce0.8Sm0.2O2-δ–SrTiO3 for Low-Temperature Solid Oxide Fuel Cells |
| title_full | A Bulk-Heterostructure Nanocomposite Electrolyte of Ce0.8Sm0.2O2-δ–SrTiO3 for Low-Temperature Solid Oxide Fuel Cells |
| title_fullStr | A Bulk-Heterostructure Nanocomposite Electrolyte of Ce0.8Sm0.2O2-δ–SrTiO3 for Low-Temperature Solid Oxide Fuel Cells |
| title_full_unstemmed | A Bulk-Heterostructure Nanocomposite Electrolyte of Ce0.8Sm0.2O2-δ–SrTiO3 for Low-Temperature Solid Oxide Fuel Cells |
| title_short | A Bulk-Heterostructure Nanocomposite Electrolyte of Ce0.8Sm0.2O2-δ–SrTiO3 for Low-Temperature Solid Oxide Fuel Cells |
| title_sort | bulk heterostructure nanocomposite electrolyte of ce0 8sm0 2o2 δ srtio3 for low temperature solid oxide fuel cells |
| topic | Bulk-heterostructure SOFC electrolyte Ionic conductivity Schottky junction Work function |
| url | https://doi.org/10.1007/s40820-020-00574-3 |
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