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Catalyst Layer Modeling

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Springer Handbook of Electrochemical Energy

Part of the book series: Springer Handbooks ((SHB))

Abstract

The overall performance of a fuel cell or an electrochemical reactor depends greatly on properties of catalyst layers, where electrochemical reactions take place. Optimization of these structures in the past was mainly guided by experimental methods. For substantial progress in this field, combination of experiments with modeling is highly desirable. In this chapter focus is on macroscale models, since at the moment they provide more straightforward relationship to experimentally measurable quantities. After introducing the physical structure of a catalyst layer, we discuss typical macroscale modeling approaches such as interface, porous, and agglomerate models. We show how governing equations for the state fields, like potential or concentration can be derived and which typical simplifications can be made. For derivations, a porous electrode model has been chosen as a reference case. We prove that the interface model is a simplification of a porous model, where all gradients can be neglected. Furthermore, we demonstrate that the agglomerate model is an extension of the porous model, where in addition to macroscale, additional length scale is considered. Finally some selected examples regarding different macroscale models have been shown. Interface model has low capability to describe the structure of the catalyst layer, but it can be utilized to resolve complex reaction mechanisms, providing reaction kinetic parameters for distributed models. It was shown that the agglomerate models, having more structural parameters of the catalyst layer, are more suitable for catalyst layer optimization than the porous models.

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Abbreviations

BET:

Brunauer–Emmett–Teller

CL:

comprising catalyst

EIS:

electrochemical impedance spectroscopy

FT:

Frumkin/Temkin

GDE:

gas diffusion electrode

GDL:

gas diffusion layer

NFRA:

nonlinear frequency response analysis

PEM:

polymer electrolyte membrane

PFSA:

perfluorosulfonic acid

SEM:

scanning electron microscopy

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Authors and Affiliations

  1. Process Systems Engineering, Max Planck Institute for Dynamics of Complex Technical Systems, Sandtorstr. 1, 39106, Magdeburg, Germany

    Tanja Vidaković-Koch & Kai Sundmacher

  2. Institute for Electric Power Systems, Electric Energy Storage Systems, Leibniz University Hannover, Appelstr. 9A, 30167, Hannover, Germany

    Richard Hanke-Rauschenbach

  3. Process Engineering, ThyssenKrupp Electrolysis GmbH, Vosskuhle 38, Harpen, 44141, Dortmund, Germany

    Isaí Gonzalez Martínez

Authors
  1. Tanja Vidaković-Koch
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  2. Richard Hanke-Rauschenbach
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  3. Isaí Gonzalez Martínez
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  4. Kai Sundmacher
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Editors and Affiliations

  1. Dept. Mechanical Engineering, TU Dresden, Helmholtzstr. 14, 01062, Dresden, Germany

    Cornelia Breitkopf

  2. Chemistry Division, US Naval Research Laboratory, 4555 Overlook Ave., DC 20375, Washington, USA

    Karen Swider-Lyons

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Vidaković-Koch, T., Hanke-Rauschenbach, R., Gonzalez Martínez, I., Sundmacher, K. (2017). Catalyst Layer Modeling. In: Breitkopf, C., Swider-Lyons, K. (eds) Springer Handbook of Electrochemical Energy. Springer Handbooks. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-46657-5_9

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