An Analytical Approximation for the Ionomer Film Model in PEMFC. Issue 9 (1st September 2022)

• Record Type: Journal Article
• Authors: Jahnke, Thomas; Baricci, Andrea
• Is Part Of: Journal of the Electrochemical Society. Volume 169:Issue 9(2022)
• Publication Date: 2022-09-01
• Subjects: Fuel Cells - PEM -- Theory and Modelling -- Ionomer film -- Oxygen transport resistance; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/1945-7111/ac94a6
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : The ionomer film and its transport resistances for oxygen are considered to be an important aspect for PEMFC performance. Ionomer film sub-models are therefore frequently used in PEMFC modeling to account for this effect. Mathematically these are expressed by a non-linear equation for the oxygen concentration, which depending on the reaction order cannot be solved analytically. Typically, a numerical solution of this equation, e.g., using the Newton-method is needed. Here, we derive a highly accurate approximate analytical solution for the ionomer film model. This enables faster computation, which is particularly important for computationally demanding higher dimensional PEMFC models.