Mathematical Modeling Analysis and Optimization of Key Design Parameters of Proton-Conductive Solid Oxide Fuel Cells

Liu, Hong; Akhtar, Zoheb; Li, Peiwen; Wang, Kai

doi:10.3390/en7010173

Cited by 17 publications

(10 citation statements)

References 24 publications

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“…This model explained the characteristic behavior of the asymmetric UC with less precision. For asymmetric UCs, electrochemical reactions take place in one of the compartments, which are difficult to model using linearization approach [45].…”

Section: Fitting Results By Developed Theoretical Modelingmentioning

confidence: 99%

Comprehensive Study on Dynamic Parameters of Symmetric and Asymmetric Ultracapacitors

et al. 2019

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Electrical storage components such as ultracapacitors (UC) have received significant attention from various industrial sectors, from electric vehicles to renewable power plants. This article presents the investigations on dynamic properties of asymmetric Li-ion hybrid (CPQ2300S: 2300 F, 2.2-3.8 V, JSR Co., Tokyo, Japan) and symmetric double-layer (BCAP3400: 3400 F, 2.85 V, Maxwell Technologies Co., San Diego, CA, USA) ultracapacitors. The internal resistance and capacitance of both UCs were slightly changed with respect to current and voltage alterations, but these changes were more prominent for the Li-ion UC. The internal resistance of the Li-ion UC became five times larger and its capacitance decreased significantly when the temperature decreased from +25 • C to −20 • C. More importantly, the double-layer UC exhibited nearly constant capacitance for a wide range of temperature changes (0 • C to −40 • C), although internal resistance increased somewhat. Electrochemical impedance spectroscopy analysis of both UCs was performed for the frequency range of 1 Hz-1 kHz and in the temperature range from −15 • C to +30 • C. It was observed that the temperature effects were much more pronounced for the asymmetric Li-ion UC than that of the symmetric double-layer UC. This work also proposes an improved equivalent circuit model based on an infinite number of resistance-capacitance (r-C) chains. The characteristic behavior of symmetric UCs can be explained precisely by the proposed model. This model is also applicable to asymmetric UCs, but with less precision. similar asymmetric UCs are also applicable to pulsed electric power sources [12,13]. Piórkowski et al. presented a case study about the application of UCs in hybrid systems including an engine start module (ESM), a photovoltaic (PV) module, a battery, and an internal combustion engine (ICE) [14]. In continuation, the hybrid model control strategy was proposed for a double active bridge-based supercapacitor energy storage system [15]. More importantly, the service lifetime of UCs is three times higher compared to electrochemical storage batteries (e.g., Li-ion or lead-acid) although UCs are relatively bulky and voluminous [16]. Consequently, there is a lack of accurate information regarding the ability of Li-ion UCs to provide voltage and current during charge-discharge cycles. Previously, a significant number of experimental investigations were carried out [16][17][18][19][20][21][22] in order to understand the characteristic behavior of UCs. Different direct measurement methods for the evaluation of UC parameters were also proposed [16][17][18][19][20]. A comprehensive review of characterization methods for supercapacitor modeling and general parameter identification techniques were also discussed [21,22].A significant amount of effort has been made to describe dynamic UC behavior using different types of equivalent circuits [23][24][25][26][27][28][29][30]. Some works presented modeling approaches based on electrochemical explanations of UC performance [31][32][33...

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Section: Fitting Results By Developed Theoretical Modelingmentioning

confidence: 99%

Comprehensive Study on Dynamic Parameters of Symmetric and Asymmetric Ultracapacitors

et al. 2019

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“…Solution to the equations will decide the potential difference between the two current collectors of the cathode and anode sides. This model for the ohmic losses analysis has been used successfully for analysis of low temperature PEM fuel cells [1,44] and solid oxide fuel cells [45,46].…”

Section: Mass Transfer In Porous Mediamentioning

confidence: 99%

Effects of geometry/dimensions of gas flow channels and operating conditions on high-temperature PEM fuel cells

Liu

Hartz

et al. 2014

Int J Energy Environ Eng

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In order to accomplish the objective of studying and optimizing the flow channel geometries and dimensions for high-temperature proton-exchange-membrane (PEM) fuel cells (with operating temperatures above 120°C), a mathematical model has been developed in this work. As the major step of the modeling, the average concentrations of gas species in bulk flows as well as in the layers of electrodes are calculated through mass transfer analysis in one-dimensional direction normal to the membrane-electrodes layers. Therefore, the concentration and activation polarizations are simulated with much less computational work compared to a three-dimensional numerical model. The ohmic loss is taken into consideration through analysis of a representative network circuit simulating the electron and proton conduction in the elements of electrodes and electrolyte, respectively. The simulated results for high-temperature PEM fuel cells were compared with experimental results from literature. The results from the simulation and experimental tests showed good agreement, which validated the mathematical model. As the model requires less computational work, it was used to analyze a large number of cases with different gas flow channel dimensions and operating conditions, and optimization to the dimensions of channels and ribs was accomplished.

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“…Over the past decades, the fabrication technologies of both the SOFC unit and its corresponding materials had been well developed to satisfy commercial requirements. Several SOFC electrode materials have been exploited, which include the pure electronic conducting medium (i.e., Pt, Ni and La 1−x Sr x MnO 3 as LSM), the O 2− conducting materials (i.e., Sm 0.2 Ce 0.8 O 2−δ as SDC and the yttrium-stabilized zirconia as YSZ), the e − /O 2− mixed conducting mediums (i.e., La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3−δ as LSCF and Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ [3]), H + conducting mediums (i.e., BaZr 0.7 Pr 0.1 Y 0.2 O 3_d [4] and BaZr 0.1 Ce 0.7 Y 0.2 O 3_d as BZCY [5]), and their mixtures.…”

Section: Introductionmentioning

confidence: 99%

Development of Large-Scale and Quasi Multi-Physics Model for Whole Structure of the Typical Solid Oxide Fuel Cell Stacks

Zhang

et al. 2018

Sustainability

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Although the performance and corresponding manufacturing technology of solid oxide fuel cells (SOFC) units have greatly improved and have met commercial requirements over the past decades, they are constructed such that they perform poorly and lack strong duration outputs. Therefore, achieving high performance and extending duration at a stack level are challenges faced by the development process. This paper develops a large-scale and multiphysics model for the complete structure of a typical 10-cell SOFC stack. It includes solid components, flow paths, and porous sections—solid ribs, interconnectors, anode support, anode function layer, electrolyte layer, cathode layer, air/fuel feed manifolds, feed header, rib channels, exhaust header and outlet manifolds. The multiphysics application includes momentum, mass, energy and quasi electrochemical transporting; and their mutual coupling processes within the stack. This new model can help us understand the working specifics of the large-scale stack, obtaining distribution details of static pressure, species fraction, and temperature gradient; further addressing optimization of structure and operation parameters. These details serve as guidelines for practical structural designs and parameters in real stack levels.

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Mathematical Modeling Analysis and Optimization of Key Design Parameters of Proton-Conductive Solid Oxide Fuel Cells

Cited by 17 publications

References 24 publications

Comprehensive Study on Dynamic Parameters of Symmetric and Asymmetric Ultracapacitors

Comprehensive Study on Dynamic Parameters of Symmetric and Asymmetric Ultracapacitors

Effects of geometry/dimensions of gas flow channels and operating conditions on high-temperature PEM fuel cells

Development of Large-Scale and Quasi Multi-Physics Model for Whole Structure of the Typical Solid Oxide Fuel Cell Stacks

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