Search Results - "Friedrich, K.A."

Measuring and modeling mass transport losses in proton exchange membrane water electrolyzers using electrochemical impedance spectroscopy by Garcia-Navarro, J.C., Schulze, M., Friedrich, K.A.

“…PEM electrolysis has gained a lot of attention in recent years due to its ability to produce clean, sustainable hydrogen. One of the crucial steps toward…”
Get full text

Initial approaches in benchmarking and round robin testing for proton exchange membrane water electrolyzers by Bender, G., Carmo, M., Smolinka, T., Gago, A., Danilovic, N., Mueller, M., Ganci, F., Fallisch, A., Lettenmeier, P., Friedrich, K.A., Ayers, K., Pivovar, B., Mergel, J., Stolten, D.

“…As ever-increasing amounts of renewable electricity enter the energy supply mix on a regional, national and international basis, greater emphasis is being…”
Get full text

Methanol as antifreeze agent for cold start of automotive polymer electrolyte membrane fuel cells by Knorr, Florian, Sanchez, Daniel Garcia, Schirmer, Johannes, Gazdzicki, Pawel, Friedrich, K.A.

“…[Display omitted] •Methanol solution is suitable as antifreeze for freeze-thaw cycling of PEMFC MEAs.•Antifreeze eliminates performance losses due to freezing…”
Get full text

Protective coatings on stainless steel bipolar plates for proton exchange membrane (PEM) electrolysers by Gago, A.S., Ansar, S.A., Saruhan, B., Schulz, U., Lettenmeier, P., Cañas, N.A., Gazdzicki, P., Morawietz, T., Hiesgen, R., Arnold, J., Friedrich, K.A.

“…Proton exchange membrane (PEM) electrolysis is a promising technology for large H2 production from surplus electricity from renewable sources. However, the…”
Get full text

Analysis of pressurized operation of 10 layer solid oxide electrolysis stacks by Riedel, M., Heddrich, M.P., Friedrich, K.A.

“…High temperature steam electrolysis using solid oxide electrolysis cell (SOEC) technology can provide hydrogen as fuel for transport or as base chemical for…”
Get full text

Theoretical and experimental study of Reversible Solid Oxide Cell (r-SOC) systems for energy storage by Santhanam, S., Heddrich, M.P., Riedel, M., Friedrich, K.A.

“…A theoretical system model to study different system concepts is presented in this study. An SOC reactor model was developed based on the experimental analysis…”
Get full text

Towards developing a backing layer for proton exchange membrane electrolyzers by Lettenmeier, P., Kolb, S., Burggraf, F., Gago, A.S., Friedrich, K.A.

“…Current energy policies require the urgent replacement of fossil energy carriers by carbon neutral ones, such as hydrogen. The backing or micro-porous layer…”
Get full text

Transient reversible solid oxide cell reactor operation – Experimentally validated modeling and analysis by Srikanth, S., Heddrich, M.P., Gupta, S., Friedrich, K.A.

“…•A hydrogen based system model was built using a dynamic validated reactor model.•A simple system configuration led to a roundtrip storage efficiency of…”
Get full text

Detecting and modeling oxygen bubble evolution and detachment in proton exchange membrane water electrolyzers by Garcia-Navarro, J.C., Schulze, M., Friedrich, K.A.

“…In this work, we discuss the effect of multiphase flow dynamics on the performance of a PEM electrolyzer. We obtained images of a flow system consisting of O2…”
Get full text

Hydration and dehydration cycles in polymer electrolyte fuel cells operated with wet anode and dry cathode feed: A neutron imaging and modeling study by García-Salaberri, P.A., Sánchez, D.G., Boillat, P., Vera, M., Friedrich, K.A.

“…Proper water management plays an essential role in the performance and durability of Polymer Electrolyte Fuel Cells (PEFCs), but it is challenged by the…”
Get full text

Combined electrochemical and surface analysis investigation of degradation processes in polymer electrolyte membrane fuel cells by Schulze, M., Wagner, N., Kaz, T., Friedrich, K.A.

“…Fuel cells allow an environmentally friendly and highly efficiently conversion of chemical energy to electricity and heat. Therefore, they have a high…”
Get full text

Impact of delithiated Li0FePO4 on the decomposition of LiPF6-based electrolyte studied by accelerating rate calorimetry by Röder, P., Baba, N., Friedrich, K.A., Wiemhöfer, H.-D.

“…Accelerating rate calorimetry (ARC) was used to investigate the impact of delithiated Li0FePO4 on the decomposition of LiPF6-based electrolyte. We used 1 M…”
Get full text

The influence of CO on the current density distribution of high temperature polymer electrolyte membrane fuel cells by Boaventura, M., Sander, H., Friedrich, K.A., Mendes, A.

“…► We study the poisoning effect of CO on high temperature PEM fuel cell anode. ► We examine the transients of the fuel cell voltage and current density…”
Get full text

Scaling-up and characterization of ultralow-loading MEAs made-up by electrospray by Martinez-Vazquez, B., Sanchez, D.G., Castillo, J.L., Friedrich, K.A., Garcia-Ybarra, P.L.

Get full text

Investigation of electrode composition of polymer fuel cells by electrochemical impedance spectroscopy by Wagner, N., Kaz, T., Friedrich, K.A.

“…In order to optimize the electrode composition and performance of Polymer Fuel Cells and to reduce the production cost of membrane electrode assemblies (MEAs),…”
Get full text

Transport properties of ionomer composite membranes for direct methanol fuel cells by Dimitrova, P, Friedrich, K.A, Vogt, B, Stimming, U

“…The present study investigates the transport properties of composite Nafion®-based membranes for direct methanol fuel cells (DMFC). The proton conductivity,…”
Get full text

Performance and methanol permeation of direct methanol fuel cells: dependence on operating conditions and on electrode structure by Gogel, V, Frey, T, Yongsheng, Zhu, Friedrich, K.A, Jörissen, L, Garche, J

“…Investigations are presented to determine the dependence of the performance of direct methanol fuel cells (DMFCs) and the methanol cross-over rate on the…”
Get full text

Poisoning of PtRu/C catalysts in the anode of a direct methanol fuel cell: a DEMS study by Seiler, T., Savinova, E.R., Friedrich, K.A., Stimming, U.

“…Poisoning of a commercial PtRu/C electrocatalyst with the products of methanol dehydrogenative adsorption has been studied in a membrane electrode assembly of…”
Get full text

Size dependence of the CO monolayer oxidation on nanosized Pt particles supported on gold by Friedrich, K.A, Henglein, F, Stimming, U, Unkauf, W

“…The CO monolayer electro-oxidation was investigated on model electrodes consisting of small Pt particles (2–5 nm size) and large particles (8–20 nm size)…”
Get full text

Cross-Linked Polyaryl Blend Membranes for Polymer Electrolyte Fuel Cells by Kerres, J., Ullrich, A., Hein, M., Gogel, V., Friedrich, K.A., Jörissen, L.

“…The preparation and characterization of different types of proton‐conducting polymer blend membranes are presented in this paper. The investigations are…”
Get full text