scholarly journals A Theoretical Model for the Triple Phase Boundary of Solid Oxide Fuel Cell Electrospun Electrodes

2019 ◽  
Vol 9 (3) ◽  
pp. 493 ◽  
Author(s):  
Wei Kong ◽  
Mengtong Zhang ◽  
Zhen Han ◽  
Qiang Zhang
Keyword(s):  
Theoretical Model ◽  
Phase Boundary ◽  
Optimization Design ◽  
Theory Model ◽  
Solid Oxide ◽  
Superior Performance ◽  
Theoretic Model ◽  
Oxide Fuel ◽  
Triple Phase Boundary ◽  
Fiber Radius

Electrospinning is a new state-of-the-art technology for the preparation of electrodes for solid oxide fuel cells (SOFC). Electrodes fabricated by this method have been proven to have an experimentally superior performance compared with traditional electrodes. However, the lack of a theoretic model for electrospun electrodes limits the understanding of their benefits and the optimization of their design. Based on the microstructure of electrospun electrodes and the percolation threshold, a theoretical model of electrospun electrodes is proposed in this study. Electrospun electrodes are compared to fibers with surfaces that were coated with impregnated particles. This model captures the key geometric parameters and their interrelationship, which are required to derive explicit expressions of the key electrode parameters. Furthermore, the length of the triple phase boundary (TPB) of the electrospun electrode is calculated based on this model. Finally, the effects of particle radius, fiber radius, and impregnation loading are studied. The theory model of the electrospun electrode TPB proposed in this study contributes to the optimization design of SOFC electrospun electrode.

Effects of Electrode Microstructure on Intermediate Temperature Solid Oxide Fuel Cell Performance

2010 ◽  
Vol 7 (5) ◽  
Author(s):  
Edward J. Naimaster ◽  
A. K. Sleiti
Keyword(s):  
Grain Size ◽  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Phase Boundary ◽  
Pore Size ◽  
Current Density ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Triple Phase Boundary ◽  
Microstructure Parameters

In this study, the effects of electrode microstructure and electrolyte parameters on intermediate temperature solid oxide fuel cell (ITSOFC) performance were investigated using a one-dimensional solid oxide fuel cell model from the Pacific Northwest National Laboratory (PNNL). The activation overpotential was investigated through the exchange current density term, which is dependent on the cathode activation energy, the cathode porosity, and the pore size and grain size at the cathode triple phase boundary. The cathode pore size, grain size, and porosity were not integrated in the PNNL model, therefore, an analytical solution for exchange current density from Deng and Petric (2005, “Geometric Modeling of the Triple-Phase Boundary in Solid Oxide Fuel Cells,” J. Power Sources, 140, pp. 297–303) was utilized to optimize their effects on performance. Through parametric evaluation and optimization of the electrode microstructure parameters, the activation overpotential was decreased by 29% and the overall ITSOFC maximum power density was increased by almost 400% from the benchmark PNNL case. The effects and importance of electrode microstructure parameters on ITSOFC performance were defined. Optimization of such parameters will be the key in creating viable ITSOFC systems. Although this was deemed successful for this project, future research should be focused on numerically quantifying and modeling the electrode microstructure in two- and three-dimensions for more accurate results, as the electrode microstructure may be highly multidimensional in nature.

scholarly journals Calculation of contact angles at triple phase boundary in solid oxide fuel cell anode using the level set method

2014 ◽  
Vol 96 ◽  
pp. 100-107 ◽  
Author(s):  
Xiaojun Sun ◽  
Yosuke Hasegawa ◽  
Haruhiko Kohno ◽  
Zhenjun Jiao ◽  
Koji Hayakawa ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Phase Boundary ◽  
Level Set ◽  
Contact Angles ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Triple Phase Boundary ◽  
Cell Anode ◽  
Fuel Cell Anode

scholarly journals Correlative Microscopy in the Laboratory: Analysis of the Triple-Phase Boundary in a Solid-Oxide Fuel Cell Electrode Using X-ray Computed Nanotomography and FIB-SEM

2010 ◽  
Vol 16 (S2) ◽  
pp. 872-873
Author(s):  
PR Shearing ◽  
J Gelb ◽  
NP Brandon
Keyword(s):  
Fuel Cell ◽  
Phase Boundary ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Correlative Microscopy ◽  
Triple Phase Boundary ◽  
X Ray ◽  
Fuel Cell Electrode ◽  
X Ray Computed ◽  
Cell Electrode

Extended abstract of a paper presented at Microscopy and Microanalysis 2010 in Portland, Oregon, USA, August 1 – August 5, 2010.

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