Research

Research project

"Production- and structure-optimized metallic flow field for bipolar plates" (ProStroM)
"Impedance based analysis and modeling of catalyst degradation in polymer electrolyte membrane fuel cells

Electrochemical characterization of PEM fuel cells

Electrochemical characterization of incremental polymer electrolyte membrane fuel cells (PEMFCs)
Development of test benches and cell housings for PEM fuel cells
Analysis of PEM fuel cells by stationary and dynamic measuring methods (polarization curves, electrochemical impedance spectroscopy, cyclic voltammatry)
Detailed analysis of impedance spectra by the distribution of relaxation times (DRT)
Analysis of the influence of different fuel cell components (MEA, GDL, bipolar plates, flow fields etc.) on the cell performance
Analysis of the influence of different three-dimensional flow field structures on the cell performance
Application of accelerated stress tests (ASTs)

Modeling of PEM fuel cells

Modeling based on equivalent circuit models (ECM) and transmission line models (TLM)
Modeling of catalyst degradation

Other

since 2021 - Member of the KIT graduate school "UpGrade Mobility"

Student thesises
Thesis title	Supervisor	Student	Period
Analysis of the influence of various material parameters on the degradation behavior of PEM fuel cells by means of electrochemical impedance spectroscopy	Sebastian Raab, M.Sc.	Vivianne Bommer	completed 08/2024
Optimization of operating parameters of PEM fuel cells and model parametrization	Sebastian Raab, M.Sc.	Tom Grom	completed 07/2023
Impedance-based characterization of PEM fuel cells	Sebastian Raab, M.Sc.	Maximilian Gruber	completed 01/2022
Electrochemical analysis of catalyst degradation in low-temperature PEM fuel cells	Sebastian Raab, M.Sc.		as soon as possible

Student assistents

Tasks	Supervisor	Student	Period
Development PEMFC test bench	Sebastian Raab	Marvin Dorn	until 03/2021
Development PEMFC test bench Automation of measurement data evaluation	Sebastian Raab	Vivianne Bommer	since 06/2021

Tasks

Supervisor

Student

Period

Development PEMFC test bench

Sebastian Raab

Marvin Dorn

until 03/2021

Development PEMFC test bench

Automation of measurement data evaluation

Sebastian Raab

Vivianne Bommer

since 06/2021

Lecture assistance
Lecture	Typ	University lecturer
Batterie- und Brennstoffzellensysteme	Lecture (V)	Dr.-Ing. Andre Weber

Publications and Conferences

Publikationen and Proceedings

S. Raab, A. Chuang, A. Weber, "In-Depth Analysis of the Impact of Ionomer Content on PEMFC Degradation By Combining Electrochemical Characterization Techniques and Transmission Line Modeling", ECS Transactions (2024), 114, 5, 337. DOI: 10.1149/11405.0337ecst.
P. Oppek, S. Raab, A. Weber, "Spatially Resolved Analysis of the Influence of Three-Dimensional Flow Field Structures on Loss Processes in PEMFCs", ECS Transactions (2024), 114, 5, 427. DOI: 10.1149/11405.0427ecst.
S. Raab and A. Weber, “Deconvolution of Gas Diffusion Processes in Incremental Polymer Electrolyte Membrane Fuel Cells”, 27^th European Electrolyzer & Fuel Cell Forum (EFCF), Proceedings (2023).
T. Goosmann, P. Oppek, S. Raab, A. Weber, Impedance-based observation and quantification of water in PEMFCs, 27th European Electrolyzer & Fuel Cell Forum (EFCF), Proceedings (2023).
S. Raab and A. Weber, “Dynamic characterization of incremental PEM Single cells at high relative humidities”, 25^th European Fuel Cell Forum (EFCF), Proceedings (2021).

Conferences

S. Raab, A. Chuang, A. Weber, "In-Depth Analysis of the Impact of Ionomer Content on PEMFC Degradation by Combining Electrochemical Characterization Techniques and Transmission Line Modeling", PRiME 2024, Honolulu, 06.-11.10.2024 (Presentation).
P. Oppek, S. Raab, A. Weber, "Spatially Resolved Analysis of the Influence of Three-Dimensional Flow Field Structures on Loss Processes in PEMFCs", PRiME 2024, Honolulu, 06.-11.10.2024 (Presentation).
Y. Fischer, P. Oppek, S. Raab, A. Weber, „Spatially Resolved Quantification of Diffusion Losses in a Segmented PEM Fuel Cell with adjustable Clamping Forces”, 20^th Symposium on Modeling Experimental Validation of Electrochemical Energy Technologies (ModVal 2024), Baden, Schweiz,12.03.-14.03.2024 (Presentation)
S. Raab und A. Weber, „Deconvolution of Gas Diffusion Processes in Incremental Polymer Electrolyte Membrane Fuel Cells”, 27^th European Electrolyzer & Fuel Cell Forum (EFCF), 04.07.2023 - 04.07.2023 (Presentation).
T. Goosmann, P. Oppek, S. Raab, A. Weber, „Impedance-based observation and quantification of water in PEMFCs", 27^th European Electrolyzer & Fuel Cell Forum (EFCF), Luzern, 04.07.-07.07.2023 (Poster)
S. Raab, T. Grom, A. Weber, „Optimization of electrochemical model parametrization for incremental PEMFCs”, ModVal Conference, Duisburg, 21.03.2023 - 23.03.2023 (Poster).
S. Raab, T. Goosmann, A. Weber, „Influence of three- dimensional flow field structures consisting of expanded metal meshes on the physicochemical loss processes in PEMFCs”, 241^st ECS Meeting, Vancouver, 29.05.2022-02.06.2022. (Presentation).
T. Goosmann, S. Raab, P. Oppek, A. Weber, E. Ivers-Tiffée, „Impedance-Based, Multi-physical DC-Performance-Model for a PEMFC Stack”, 241^st ECS Meeting, Vancouver, 29.05.2022-02.06.2022 (Presentation).
S. Raab und A. Weber, “Dynamic characterization of incremental PEM Single cells at high relative humidities”, 25^th European Fuel Cell Forum (EFCF), 29.06.2021 - 02.07.2021. (Presentation)