Operando current mapping on PEM water electrolysis cells. Influence of mechanical stress

Verdin, Baptiste; Fouda-Onana, F.; Germe, Sébastien; Serre, Guillaume; Jacques, Pierre-André; Millet, Pierre

doi:10.1016/j.ijhydene.2017.08.189

Cited by 41 publications

(19 citation statements)

References 24 publications

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“…Generally, the resistance of the setup is relatively high in comparison to the literature data for cells using Nafion117 membranes. 22 Though, the work of Verdin et al 7 has shown that a similar S++ setup exhibits even higher Ohmic resistances.…”

Section: Current Density Distribution-in a Preliminary Work The Authorsmentioning

confidence: 98%

Local Current Density and Electrochemical Impedance Measurements within 50 cm Single-Channel PEM Electrolysis Cell

Immerz

Bensmann

Trinke

et al. 2018

J. Electrochem. Soc.

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The present analysis shows the local distribution of current density and EIS measurements along a 50 cm single-channel proton exchange membrane water electrolysis (PEMWE) cell. Measurements for operating modes with one sufficiently high and one insufficiently low stoichiometric water ratio (λ) were carried out to observe effects on the current density distribution. Furthermore, global and local EIS measurements were performed to distinguish between the cell voltage loss differences in the two cases. The mass transport losses η mtx and the Ohmic voltage losses η show a strong increase, when the stoichiometric water ratio falls below a level of λ ≈ 5. The reduction of the inlet water flux of the anode reduces both the proton conductivity of the ionomer within the catalyst layer and the membrane, increasing transport and Ohmic resistances, respectively. The local analysis has shown that the level of membrane and catalyst hydration under low stoichiometric conditions can be distributed highly non-homogeneous in along-the-channel direction, with the most pronounced dehydration toward the end of the channel.

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Section: Current Density Distribution-in a Preliminary Work The Authorsmentioning

confidence: 98%

Local Current Density and Electrochemical Impedance Measurements within 50 cm Single-Channel PEM Electrolysis Cell

Immerz

Bensmann

Trinke

et al. 2018

J. Electrochem. Soc.

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show abstract

“…Heat management.-Efficient heat management in the cell represents a main engineering challenge to overcome. [43][44][45][46] In particular the thermal conductivity of the PTLs σ therm features a critical parameter. The investigated materials show conductivity differences over an order of magnitude from 1 to 10 W/(mK), 8,12 see Part I.…”

Section: F561mentioning

confidence: 99%

Polymer Electrolyte Water Electrolysis: Correlating Performance and Porous Transport Layer Structure: Part II. Electrochemical Performance Analysis

Schuler

Schmidt

Büchi

2019

J. Electrochem. Soc.

142

206

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In the first paper of this series the bulk and surface structural properties of Ti-fiber based porous transport layers (PTL) were characterized and described. In this second part the correlation of structure to the performance in polymer electrolyte water electrolysis cells is analyzed by determination of the three main overpotentials of ohmic, kinetics and mass transport losses. The strongest correlation between the PTL bulk transport properties and cell performance is obtained for heat transport. The current density dependent temperature gradients show good agreement with ex situ determined heat conductivity from part one. However, surface properties of the PTL materials, have a stronger influence on cell performance than the bulk properties. Catalyst layer utilization and ohmic interfacial resistances correlate with the interfacial contact areas reported in part one and performance increases with increasing contact area. This is due to a local mass transport resistance decreasing with increasing catalyst layer utilization.

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“…Inevitable uncertainties can complicate a thorough assessment of experimental results in general. Experimental tests have been reported on material analysis (e.g., [2,3]), operating conditions (e.g., [4,5]), cell design (e.g., [6,7]), or the analysis of systematic phenomena (e.g., [8,9]), which are sometimes difficult to generalize without knowledge of the existing system constraints. Additionally, a well-known key issue for PEMWE is the scalability of these results from the microscopic to the system level (e.g., [10]).…”

Section: Introductionmentioning

confidence: 99%

Effect of the MEA design on the performance of PEMWE single cells with different sizes

et al. 2018

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In the field of polymer electrolyte membrane water electrolysis (PEM-WE), a significant amount of excellent scientific results has been generated during the past decades. However, the comparability and reproducibility of these results between different cell types and different laboratories is not always straightforward. In this contribution, an exemplary ring experiment on the single-cell level compares the performances of three cell types: the differential cell (4 cm 2) and two integral cells: an elongated cell (50.4 cm × 0.45 cm) and a circular cell (63.5 cm). Therefore bi-and trilateral experiments were carried out with differently prepared catalystcoated membranes (CCMs) and porous transport layers (PTLs) as well as with an alternative catalyst-coated electrode (CCE) concept in three laboratories. This contribution aims to evaluate the grade of systemic inequality, which still permits a comparison of individual parameters. The comparison of CCM preparation methods showed no significant influence on the initial electrochemical characteristics. An HCl etching of the anode PTLs in two different cells confirmed to be a useful treatment for the reduction of Ohmic losses in PEMWE cells. Self-made CCEs could not serve as an alternative concept, owing to their inadequate contact between the electrode and the membrane, which was observed in three laboratories as well. The general compatibility between the different cells was proven by the observation of a phenomenon in one laboratory that could be reproduced in one or two other laboratories. In this context, the size and geometry of the single cells did not influence the performance, indicating that up to the present measuring range and with sufficient water feed rates, the different single cells were functioning comparably.

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Operando current mapping on PEM water electrolysis cells. Influence of mechanical stress

Cited by 41 publications

References 24 publications

Local Current Density and Electrochemical Impedance Measurements within 50 cm Single-Channel PEM Electrolysis Cell

Local Current Density and Electrochemical Impedance Measurements within 50 cm Single-Channel PEM Electrolysis Cell

Polymer Electrolyte Water Electrolysis: Correlating Performance and Porous Transport Layer Structure: Part II. Electrochemical Performance Analysis

Effect of the MEA design on the performance of PEMWE single cells with different sizes

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