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![System Optimization and Material Development of Solid Oxide Cells for Energy Conversion and Storage için kapak resmi System Optimization and Material Development of Solid Oxide Cells for Energy Conversion and Storage için kapak resmi](/client/assets/d79c3e4af2b6d196/ctx/images/no_image.png)
System Optimization and Material Development of Solid Oxide Cells for Energy Conversion and Storage
Başlık:
System Optimization and Material Development of Solid Oxide Cells for Energy Conversion and Storage
Yazar:
Lei, Libin, author.
ISBN:
9780438112018
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (137 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 79-11(E), Section: B.
Advisors: Fanglin Chen Committee members: Kevin Huang; Xinyu Huang; John R. Regalbuto.
Özet:
Solid oxide cells can convert chemical energy to electricity in the fuel cell mode and store electricity to chemicals in the electrolysis mode. However, there are still critical barriers, such as energy efficiency and durability, for the development and commercialization of SOCs. The objective of this dissertation is to apply system optimization and materials design to address the critical barriers for solid oxide cells in energy conversion and energy storage applications. One major focus of the dissertation is related to improve energy efficiency, enhance the cell performance and achieve multifunctionality in solid oxide electrolysis cells. In addition, development of robust air electrode and mitigation of Cr poisoning in the air electrode of solid oxide fuel cells is also pursued.
Electrolysis of steam or carbon dioxide using SOECs is a promising energy storage method that can efficiently convert electrical energy into chemicals. In conventional SOECs, a significant portion of electricity input is consumed to overcome a large oxygen potential gradient between the electrodes. Therefore, to reduce the electricity consumption and improve the system efficiency, a novel and efficient syngas generator, integrating carbon gasification and solid oxide co-electrolysis, is presented and evaluated in the first part of this dissertation. Both thermodynamic calculation and experimental results show that the potential barrier for co-electrolysis can be reduced by about 1 V and the electricity consumption can be reduced by more than 90% upon integration SOECs with carbon gasification. On the anode side, "CO shuttle" between the electrochemical reaction sites and solid carbon is realized through the Boudouard reaction. Simultaneous production of CO on the anode side and CO/H2 on the cathode side generates syngas that can serve as fuel for power generation or feedstock for chemical plants. The integration of carbon gasification and SOECs provides a potential pathway for efficient utilization of electricity, coal/biomass, and CO2 to store electrical energy, produce clean fuel, and achieve a carbon neutral sustainable energy supply.
In the second part of this dissertation, to achieve multifunctionality and regulate product in SOECs, a novel micro-tubular electrochemical reactor is studied, in which high temperature co-electrolysis of H2O-CO 2 and low temperature methanation processes are synergistically integrated. The temperature gradient along the micro-tubular reactor provides favorable conditions for both the electrolysis and methanation reactions. Moreover, the micro-tubular reactor can provide high volumetric factor for both the electrolysis and methanation processes. When the cathode of the micro-tubular reactor is fed with a stream of 10.7% CO2, 69.3% H2 and 20.0% H 2O, an electrolysis current of -0.32 A improves CH4 yield from 12.3% to 21.1% and CO2 conversion rate from 64.9% to 87.7%, compared with the operation at open circuit voltage. Furthermore, the effects of the inlet gas composition in the cathode on CO2 conversion rate and CH4 yield are systematically investigated. Higher ratio of H:C in the inlet results in higher CO2 conversion rate. Among all the cases studied, the highest CH4 yield of 23.1% has been achieved when the inlet gas in the cathode is consisted of 21.3% CO2, 58.7% H2 and 20.0% H2O with an electrolysis current of -0.32 A.
Solid oxide fuel cell is the reverse operation of SOEC and can directly convert the chemical energy in fuels to electricity with high efficiency and is fuel flexible. The durability and performance of SOFCs are highly related to the reaction kinetics and stability of the air electrode. The effects of this impregnation on the electrochemical performance and durability of H-SOFCs are investigated in the forth part of the dissertation. Single cells with impregnated LSCF cathode and BZY electrolyte yield a maximum power density of 0.198 W cm-2 at 873 K, more than doubled than that with blank LSCF cathode at the same operating conditions. Electrical conductivity relaxation and electrochemical impedance spectroscopy studies reveal that the hybrid catalyst can substantially accelerate the oxygen-ion transfer and oxygen dissociation-absorption processes in the cathode, resulting in significantly lower polarization resistance and higher MPD. In addition, the hybrid catalyst possesses good chemical and microstructural stability at 600 °C. Consequently, the single cells with impregnated LSCF cathode show excellent durability. This study shows that the impregnation of this novel hybrid catalyst in the cathode could be a promising approach to improve the performence and stability of H-SOFCs. (Abstract shortened by ProQuest.).
Notlar:
School code: 0202
Konu Başlığı:
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(688716.1) | 688716-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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