Investigation and evaluation of water permeation through BaCe0.8Y0.2O3-δ electrolyte for solid oxide fuel cells
Başlık çevirisi mevcut değil.
- Tez No: 402717
- Danışmanlar: PROF. IAN METCALFE, DR. EVANGELOS PAPAIOANNOU
- Tez Türü: Doktora
- Konular: Kimya Mühendisliği, Chemical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2016
- Dil: İngilizce
- Üniversite: Newcastle University
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Kimya Mühendisliği Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 192
Özet
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Özet (Çeviri)
The commercial development of solid oxide fuel cells (SOFCs) is limited due to problems such as carbon deposition at the anode, temperature gradients in the cell and dilution of fuel at the anode. The purpose of this study is to investigate the feasibility of utilising a water permeable membrane in an SOFC with simultaneous water permeation. The idea is to transport water from cathode to anode for reforming of hydrocarbon fuels at the anode which could help overcome the above mentioned limitations. A mathematical model is developed for hydration of BaCe0.8Y0.2O3-s (BCY20) and BaCe0.9Y0.1O3-s (BCY10) using the Nernst-Planck equation. This is used to calculate diffusion coefficients of protonic defects and oxygen vacancies (responsible for water permeation). The diffusion coefficients of protonic defects are found to be greater than oxygen vacancies within the membranes, which are in agreement with literature. The concentration of protonic defects increases rapidly at the hydration surface of the membrane following the introduction of water into the reaction chamber. This suggests that the presence of water initiates a rapid formation of protonic defects. The water permeation for unmodified and catalytically modified BCY20 surfaces with platinum is measured between 500-800 °C. The feasibility of coupled water permeation with the water gas shift reaction (WGSR) is done at 700 °C. Data suggests that there is an increase in water permeation when the feed side surface is catalytically modified compared with unmodified surface. This implies that platinum catalyses water permeation by increasing the oxygen/hydrogen exchange rate on the feed side surface. However, the water permeation decreases when platinum is applied on the permeate side surface, indicating that platinum plays a blocking role in water recombination. When 1% carbon monoxide is supplied to the permeate side during the coupled water permeation with the WGSR study, a 1.5 fold increase in the water permeation is observed. The post operation x-ray diffraction analysis of membranes revealed that BCY20 decomposed to cerium oxide and barium carbonate. The study also explored the simultaneous water and oxygen transport through BCY20. Results demonstrated that water transport is independent of externally applied potential. Additionally, there is no dramatic change observed in oxygen transport due to presence of water in air at the cathode. Fuel cells fuelled with carbon monoxide or methane displayed low power densities compared to conventional SOFCs due to insufficient water permeation and low catalytic activity of anode towards reforming reactions as well as carbon deposition.
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