Modeling Ion Transport in Fuel Cell Electrodes including Water|Electrolyte Interfaces and Electric Double Layers

2019 ◽  
Vol 41 (1) ◽  
pp. 179-188 ◽  
Author(s):  
Iryna Zenyuk ◽  
Jooyeob Lee ◽  
Shawn Litster
Keyword(s):  
Fuel Cell ◽  
Ion Transport ◽  
Double Layers ◽  
Fuel Cell Electrodes ◽  
Electric Double Layers

A Numerical Model to Simulate Diffuse Effects in Microfluidic Fuel Cells

2010 ◽  
Author(s):  
Isaac B. Sprague ◽  
Prashanta Dutta
Keyword(s):  
Fuel Cell ◽  
Numerical Model ◽  
Laminar Flow ◽  
Ion Transport ◽  
Double Layer ◽  
Electric Double Layer ◽  
Double Layers ◽  
Algebraic Equations ◽  
Microfluidic Fuel Cell ◽  
Volume Method

A 2D numerical model is developed for a laminar flow fuel cell considering ion transport and the electric double layer around the electrodes. The Frumkin-Butler-Volmer equation is used for the fuel cell kinetics. The finite volume method is used to form algebraic equations from governing partial differential equations. The numerical solution was obtained using Newton’s method and a block TDMA solver. The model accounts for the coupling of charged ion transport with the electric field and is able to fully resolve the diffuse regions of the electric double layer in both the stream-wise and cross-channel directions. Different operating phenomena, such as laminar flow separation and the development of the depletion boundary layers and electric double layers are obtained. These numerical results demonstrate the model’s ability to capture the complex behavior of a microfluidic fuel cell which has been ignored in previous 1D models.

scholarly journals Non-scaling behavior of electroosmotic flow in voltage-gated nanopores

2017 ◽  
Vol 19 (1) ◽  
pp. 450-457 ◽  
Author(s):  
Cheng Lian ◽  
Alejandro Gallegos ◽  
Honglai Liu ◽  
Jianzhong Wu
Keyword(s):  
Electrical Conductivity ◽  
Ion Transport ◽  
Pore Size ◽  
Size Effects ◽  
Electroosmotic Flow ◽  
Scaling Behavior ◽  
Double Layers ◽  
Electric Double Layers ◽  
Voltage Gated ◽  
Ionic Size

Ionic size effects and electrostatic correlations result in the non-monotonic dependence of the electrical conductivity on the pore size. For ion transport at a high gating voltage, the conductivity oscillates with the pore size due to a significant overlap of the electric double layers.

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