Development of symmetrical solid oxide fuel cell and electrolysis cell

This study investigates the electrochemical performance of using Strontium Ferromolybdate (Sr2Fe1.5Mo0.5O6−δ, SFMO) perovskites as symmetrical electrodes under Solid Oxide Electrolysis Cell (SOEC) modes for water, pure carbon dioxide and co-electrolysis operations. SFMO was prepared through solution...

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Main Author: Chan, Priscilla Yu Ying
Other Authors: Su Pei-Chen
Format: Final Year Project
Language:English
Published: Nanyang Technological University 2021
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Online Access:https://hdl.handle.net/10356/149473
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spelling sg-ntu-dr.10356-1494732021-05-19T03:30:52Z Development of symmetrical solid oxide fuel cell and electrolysis cell Chan, Priscilla Yu Ying Su Pei-Chen School of Mechanical and Aerospace Engineering peichensu@ntu.edu.sg Science::Chemistry::Physical chemistry::Electrochemistry Engineering::Mechanical engineering This study investigates the electrochemical performance of using Strontium Ferromolybdate (Sr2Fe1.5Mo0.5O6−δ, SFMO) perovskites as symmetrical electrodes under Solid Oxide Electrolysis Cell (SOEC) modes for water, pure carbon dioxide and co-electrolysis operations. SFMO was prepared through solution combustion synthesis at a calcination temperature of 1200°C while the electrolyte material LSGM was fabricated using solid-state sintering at 1450°C. Electrochemical impedance spectroscopy and polarisation studies were used for the evaluation of cell performance. High electrochemical performance and stability have been observed for water electrolysis under various steam contents of hydrogen atmosphere. In which, 20% water concentration showed the best results of 0.951 A cm^-2 with 0.295 Ω cm^2 at 800°C and 1.4V. Under pure carbon dioxide electrolysis at 800°C and 1.4V, the current density and polarisation resistance were 0.435 A cm^-2 and 0.350 Ω cm^2 respectively. As for the co-electrolysis operations under different gas contents, 50% stream with 50% carbon dioxide presented more stable results with 0.556 A cm^-2 and 0.5166 Ω cm^2 at 800°C and 1.4V. An unusual polarisation curve was observed for co-electrolysis at low water concentrations (3%), which also displayed a cell degradation when a short-term stability test was conducted. In this case, microstructures and phase identification of the SFMO and LSGM have been analysed using FESEM and XRD techniques. Parasitic behaviour for co-electrolysis is determined to be due to site chemical reaction of SFMO with carbon dioxide. Further research in this area can be conducted to evaluate the performance of SFMO electrodes in syngas production. Bachelor of Engineering (Mechanical Engineering) 2021-05-19T03:30:52Z 2021-05-19T03:30:52Z 2021 Final Year Project (FYP) Chan, P. Y. Y. (2021). Development of symmetrical solid oxide fuel cell and electrolysis cell. Final Year Project (FYP), Nanyang Technological University, Singapore. https://hdl.handle.net/10356/149473 https://hdl.handle.net/10356/149473 en B336 application/pdf Nanyang Technological University
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Science::Chemistry::Physical chemistry::Electrochemistry
Engineering::Mechanical engineering
spellingShingle Science::Chemistry::Physical chemistry::Electrochemistry
Engineering::Mechanical engineering
Chan, Priscilla Yu Ying
Development of symmetrical solid oxide fuel cell and electrolysis cell
description This study investigates the electrochemical performance of using Strontium Ferromolybdate (Sr2Fe1.5Mo0.5O6−δ, SFMO) perovskites as symmetrical electrodes under Solid Oxide Electrolysis Cell (SOEC) modes for water, pure carbon dioxide and co-electrolysis operations. SFMO was prepared through solution combustion synthesis at a calcination temperature of 1200°C while the electrolyte material LSGM was fabricated using solid-state sintering at 1450°C. Electrochemical impedance spectroscopy and polarisation studies were used for the evaluation of cell performance. High electrochemical performance and stability have been observed for water electrolysis under various steam contents of hydrogen atmosphere. In which, 20% water concentration showed the best results of 0.951 A cm^-2 with 0.295 Ω cm^2 at 800°C and 1.4V. Under pure carbon dioxide electrolysis at 800°C and 1.4V, the current density and polarisation resistance were 0.435 A cm^-2 and 0.350 Ω cm^2 respectively. As for the co-electrolysis operations under different gas contents, 50% stream with 50% carbon dioxide presented more stable results with 0.556 A cm^-2 and 0.5166 Ω cm^2 at 800°C and 1.4V. An unusual polarisation curve was observed for co-electrolysis at low water concentrations (3%), which also displayed a cell degradation when a short-term stability test was conducted. In this case, microstructures and phase identification of the SFMO and LSGM have been analysed using FESEM and XRD techniques. Parasitic behaviour for co-electrolysis is determined to be due to site chemical reaction of SFMO with carbon dioxide. Further research in this area can be conducted to evaluate the performance of SFMO electrodes in syngas production.
author2 Su Pei-Chen
author_facet Su Pei-Chen
Chan, Priscilla Yu Ying
format Final Year Project
author Chan, Priscilla Yu Ying
author_sort Chan, Priscilla Yu Ying
title Development of symmetrical solid oxide fuel cell and electrolysis cell
title_short Development of symmetrical solid oxide fuel cell and electrolysis cell
title_full Development of symmetrical solid oxide fuel cell and electrolysis cell
title_fullStr Development of symmetrical solid oxide fuel cell and electrolysis cell
title_full_unstemmed Development of symmetrical solid oxide fuel cell and electrolysis cell
title_sort development of symmetrical solid oxide fuel cell and electrolysis cell
publisher Nanyang Technological University
publishDate 2021
url https://hdl.handle.net/10356/149473
_version_ 1701270608593027072