Fabrication and electrochemical performance analysis of nanocomposite for low-temperature SOFC

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Zhu, Bin, Prof., Royal Institute of Technology KTH, Sweden and Hubei University, China
dc.contributor.author Jing, Yifu
dc.date.accessioned 2017-08-09T09:02:48Z
dc.date.available 2017-08-09T09:02:48Z
dc.date.issued 2017
dc.identifier.isbn 978-952-60-7537-2 (electronic)
dc.identifier.isbn 978-952-60-7538-9 (printed)
dc.identifier.issn 1799-4942 (electronic)
dc.identifier.issn 1799-4934 (printed)
dc.identifier.issn 1799-4934 (ISSN-L)
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/27503
dc.description.abstract Low-temperature solid oxide fuel cell (LTSOFC) offers a promising new energy conversion technology, which converts chemical energy into electrical energy. The benefits of LTSOFC technology include a low operating temperature, relatively high energy conversion efficiency, and potentially low costs. One of the key challenges with LTSOFC, however, is the power density and the ionic conductivity of the electrolyte, which still needs improvement. In this work, several different synthetic and fabrication processes, such as co-precipitation synthesis, freeze-drying synthesis, and spark plasma sintering (SPS) techniques were employed to enhance the performance of the composite electrolyte for the LTSOFC fuel cell. As the base electrolyte material, samarium-doped ceria (SDC) was employed, which was also modified by adding a carbonate element (CSDC). A LiNiCuZn electrode composite was utilized, which was synthesized using the slurry method. The ionic conductivity of the electrolyte could be improved via the freeze-drying and SPS methods as opposed to the co-precipitation method. The cold-pressing and hot-pressing methods were separately applied to prepare laboratory unit cells of the LTSOFC with the following results. The highest power density obtained was 1 W/cm2 at 470 oC. The best ionic conductivities were obtained by freeze-drying and the SPS, which exceeded 0.4 S/cm. In a carbonate-SDC electrolyte, adding CO2 to the air oxidant clearly improved the power density and the open circuit voltage of the fuel cell. The power density was improved by 30–100% and the OCV by 0.1–0.2 V compared to using pure air as an oxidant. en
dc.format.extent 81 + app. 47
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Aalto University en
dc.publisher Aalto-yliopisto fi
dc.relation.ispartofseries Aalto University publication series DOCTORAL DISSERTATIONS en
dc.relation.ispartofseries 138/2017
dc.relation.haspart [Publication 1]: Jing Y., Ma Y., Patakangas J., Zhu B., Johnsson M., Erkin C. M., Lund P. Enhanced conductivity of SDC-based nano-composite electrolyte by spark plasma sintering. International Journal of Hydrogen Energy, 39, 14391–14396 (2014). DOI: 10.1016/j.ijhydene.2014.02.126
dc.relation.haspart [Publication 2]: Jing Y., Patakangas J., Lund P., Zhu B. An improved synthesis method of ceria-carbonate based composite electrolytes for low-temperature SOFC fuel cells. International Journal of Hydrogen Energy, 38, 16532-16538 (2013). DOI: 10.1016/j.ijhydene.2013.05.136
dc.relation.haspart [Publication 3]: Jing Y., Qin H., Liu Q., Singh M., Zhu B., Synthesis and electrochemical performances of LiNiCuZn oxides as anode and cathode catalyst for low temperature solid oxide fuel cell. Journal of Nanoscience and Nanotechnology, 12, 1-5 (2012). DOI: 10.1166/jnn.2012.4940
dc.relation.haspart [Publication 4]: Jing Y., Lund P. Effect of alkali carbonate in SDC electrolyte for nano-composite fuel cell. Nano Energy Systems, 1(1), 22-28 (2017).
dc.relation.haspart [Publication 5]: Patakangas J., Jing Y., Asghar, M.I., Lund P. Investigation of LiNiCuZn-oxide electrodes prepared by different methods: synthesis, characterization and properties for nanocomposite fuel cells. International Journal of Hydrogen Energy, 41(18), 7609–7613 (2016). DOI: 10.1016/j.ijhydene.2015.10.133
dc.subject.other Energy en
dc.subject.other Physics en
dc.title Fabrication and electrochemical performance analysis of nanocomposite for low-temperature SOFC en
dc.type G5 Artikkeliväitöskirja fi
dc.contributor.school Perustieteiden korkeakoulu fi
dc.contributor.school School of Science en
dc.contributor.department Teknillisen fysiikan laitos fi
dc.contributor.department Department of Applied Physics en
dc.subject.keyword fuel cells en
dc.subject.keyword low-temperature SOFC en
dc.subject.keyword nanocomposite en
dc.subject.keyword ionic conductivity en
dc.subject.keyword hydrogen en
dc.identifier.urn URN:ISBN:978-952-60-7537-2
dc.type.dcmitype text en
dc.type.ontasot Doctoral dissertation (article-based) en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.contributor.supervisor Lund, Peter D., Prof., Aalto University, Department of Applied Physics, Finland
dc.opn Professor Yongdan LiTianjin University, China
dc.contributor.lab New Energy Technologies en
dc.rev Wang, Hao, Prof., Hubei University, China
dc.rev Ni, Meng, Prof., Hong Kong Polytechnic University, Hong Kong
dc.date.defence 2017-09-29


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