Modeling of oxygen reduction mechanism for 3PB and 2PB pathways at solid oxide fuel cell cathode from multi-step charge transfer

2012 ◽  
Vol 201 ◽  
pp. 204-218 ◽  
Author(s):  
Mingyang Gong ◽  
Randall S. Gemmen ◽  
Xingbo Liu
Keyword(s):  
Charge Transfer ◽  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Oxygen Reduction ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Reduction Mechanism ◽  
Fuel Cell Cathode ◽  
Oxygen Reduction Mechanism ◽  
Cell Cathode

Multiscale Transient and Steady-State Study of the Influence of Microstructure Degradation and Chromium Oxide Poisoning on Solid Oxide Fuel Cell Cathode Performance

2018 ◽  
Vol 43 (1) ◽  
pp. 21-42 ◽  
Author(s):  
Guanchen Li ◽  
Michael R. von Spakovsky ◽  
Fengyu Shen ◽  
Kathy Lu
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Oxygen Reduction ◽  
Chromium Oxide ◽  
Spatial Scales ◽  
Solid Oxide ◽  
Heat Diffusion ◽  
Oxide Fuel ◽  
Fuel Cell Cathode ◽  
Cell Cathode

AbstractOxygen reduction in a solid oxide fuel cell cathode involves a nonequilibrium process of coupled mass and heat diffusion and electrochemical and chemical reactions. These phenomena occur at multiple temporal and spatial scales, making the modeling, especially in the transient regime, very difficult. Nonetheless, multiscale models are needed to improve the understanding of oxygen reduction and guide cathode design. Of particular importance for long-term operation are microstructure degradation and chromium oxide poisoning both of which degrade cathode performance. Existing methods are phenomenological or empirical in nature and their application limited to the continuum realm with quantum effects not captured. In contrast, steepest-entropy-ascent quantum thermodynamics can be used to model nonequilibrium processes (even those far-from equilibrium) at all scales. The nonequilibrium relaxation is characterized by entropy generation, which can unify coupled phenomena into one framework to model transient and steady behavior. The results reveal the effects on performance of the different timescales of the varied phenomena involved and their coupling. Results are included here for the effects of chromium oxide concentrations on cathode output as is a parametric study of the effects of interconnect-three-phase-boundary length, oxygen mean free path, and adsorption site effectiveness. A qualitative comparison with experimental results is made.

scholarly journals Study of oxygen reduction mechanism on Ag modified Sm1.8Ce0.2CuO4 cathode for solid oxide fuel cell

2013 ◽  
Vol 38 (32) ◽  
pp. 14060-14066 ◽  
Author(s):  
Li-Ping Sun ◽  
Hui Zhao ◽  
Qiang Li ◽  
Li-Hua Huo ◽  
Jean-Paul Viricelle ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Oxygen Reduction ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Reduction Mechanism ◽  
Oxygen Reduction Mechanism

scholarly journals A robust and active hybrid catalyst for facile oxygen reduction in solid oxide fuel cells

2017 ◽  
Vol 10 (4) ◽  
pp. 964-971 ◽  
Author(s):  
Yu Chen ◽  
Yan Chen ◽  
Dong Ding ◽  
Yong Ding ◽  
YongMan Choi ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide Fuel Cell ◽  
Oxygen Reduction ◽  
Electrocatalytic Activity ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Hybrid Catalyst ◽  
Fuel Cell Cathode

A hybrid catalyst coating dramatically enhances the electrocatalytic activity and durability of a solid oxide fuel cell cathode.

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