Nafion 117 stability under conditions of PEM water electrolysis at elevated temperature and pressure

Mališ, Jakub; Mazúr, Petr; Paidar, Martin; Bystroň, Tomáš; Bouzek, Karel

doi:10.1016/j.ijhydene.2015.11.102

Cited by 71 publications

(80 citation statements)

References 33 publications

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“…From the graph it is found that Z re, HF min decreases 2.14 m cm 2 per degree increase in temperature and that the total cell resistance decreases 3.29 m cm 2 per degree increase in temperature. These results are in the Figure 8 compared to the decrease in in-plane Nafion 117 membrane resistance of 1.31 m cm 2 per degree increase in temperature reported by Malis et al 26 The decrease in resistance with temperature for the total cell resistance, Z re, HF min and the literature values for the in-plane Nafion 117 membrane resistance is in the same order of magnitude, and this may imply that all the resistive impedance contributions in the PEMEC originate from Nafion in the electrolyte and in the electrodes. When comparing the average values of the resistances of the low and middle frequency arcs in Table IV at 53 and 61 • C, a decrease in resistance of 2.13 m cm 2 per degree increase in cell temperature is found.…”

Section: Discussionsupporting

confidence: 57%

“…From Table III it can be seen that Z re, HF min is not dependent on current density, but dependent of temperature. One could think that Z re, HF min is the Nafion electrolyte resistance, but this is not the case, since the reported values for Z re, HF min is slightly higher than the pure electrolyte resistance reported by Malis et al 26 They reported conductivity measurements on hydrated Nafion 117 membranes, which prior to EIS examination had been operated in PEMECs, and according to their findings, the membrane resistance should be 0.159 cm 2 at 53 • C, 0.148 cm 2 at 61 • C and 0.138 cm 2 at 69…”

Section: Discussionmentioning

confidence: 77%

“…These findings cause us to suggest an equivalent circuit for the PEMEC consisting of a serial electrolyte resistance obtained from the literature values reported by Malis et al, 26 a high frequency arc originating from current constrictions at the electrolyte and electrode interface and two low and middle frequency arcs originating from the composite IrO x /Nafion anode. Therefore, the equivalent circuit is suggested to be R-R 1 Q 1 -R 2 Q 2 -R 3 Q 3.…”

Section: Discussionmentioning

confidence: 81%

“…The results are compared to in-plane resistance measurements of operated Nafion 117 membranes reported by Malis at al. 26 (circles).…”

Section: Discussionmentioning

confidence: 99%

“…The area specific resistance of the Nafion 117 membrane is calculated based on inplane conductivity measurements of a Nafion 117 membrane used for electrolysis reported by Malis et al 26 First, the average thickness is calculated from the thicknesses reported in Table 1 …”

Section: Appendix: Calculations Of the Area Specific Resistance Of Thmentioning

confidence: 99%

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Electrochemical Characterization of a PEMEC Using Impedance Spectroscopy

Elsøe

Grahl‐Madsen

Scherer³

et al. 2017

J. Electrochem. Soc.

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In this study, electrochemical impedance spectroscopy (EIS) is applied in combination with cyclic voltammetry (CV) and current density -cell voltage curves (iV-curves) to investigate the processes contributing to the total impedance of a polymer electrolyte membrane electrolysis cell (PEMEC). iV-curves were linear above 0.35 A cm −2 implying ohmic processes to be performance limiting, however the impedance spectra showed three arcs indicating three electrochemical reactions at these conditions not to be purely ohmic, but also to have capacitive properties. A hypothesis that the composite IrO x /Nafion anode catalyst layer causes two of these arcs with a constant sum of resistance and current constrictions cause the third arc, is suggested. This hypothesis implies that the total differential cell resistance at current densities above 0.35 A cm −2 is purely ascribed to protonic resistance in Nafion in this type of PEMEC. The interest in renewable electrical energy obtained from e.g. wind turbines and solar cells have increased over the past years. However, the demand of electrical energy from society does not always correlate with the renewable electrical energy production, and a method to store the excess electrical energy for later use is needed. One such method is electrolysis of water into hydrogen and thus converts electrical energy into chemical energy bound in the hydrogen molecules, and thereby the energy can be stored. PEMECs have the ability to operate at high current densities, which reduces the operation costs.

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Section: Discussionsupporting

confidence: 57%

Section: Discussionmentioning

confidence: 77%

Section: Discussionmentioning

confidence: 81%

“…The results are compared to in-plane resistance measurements of operated Nafion 117 membranes reported by Malis at al. 26 (circles).…”

Section: Discussionmentioning

confidence: 99%

Section: Appendix: Calculations Of the Area Specific Resistance Of Thmentioning

confidence: 99%

See 3 more Smart Citations

Electrochemical Characterization of a PEMEC Using Impedance Spectroscopy

Elsøe

Grahl‐Madsen

Scherer³

et al. 2017

J. Electrochem. Soc.

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Electrochemical Hydrogen Production from SO₂and Water in a SDE Electrolyzer

Krüger

Kerres

Krieg

et al. 2017

Hydrogen Production Technologies

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Review and Prospects of PEM Water Electrolysis at Elevated Temperature Operation

Bonanno,

Müller,

Bensmann

et al. 2023

Adv Materials Technologies

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Polymer electrolyte membrane water electrolyzers (PEMWE) are currently restricted to an operating temperature range between 50 to 80 °C. This review shows that elevated temperature (ET) above 90 °C can be advantageous with respect to i) reduced cell voltages, ii) a reduction of catalyst loading or possibly the employment of less noble electrocatalysts, and iii) a greater potential for waste heat utilization when the electrolyzer is operated in exothermal mode (when the cell voltage is higher than the thermoneutral voltage). Together with presenting an overview of the materials and components utilized in elevated temperature PEMWE under liquid and steam operation, this article summarizes the experimental and modeling performances reported to date, highlights the challenges ahead, and suggests aspects, which will need to be considered to improve the performance at elevated temperature. Key points, which arise from this work are the extensive need of re‐assessing the material selection both for the cell components and also at a system level, the effects and optimization of working with steam operation, and in the long run, the need for techno‐economic analyses to ultimately assess whether efficiency gains will truly translate to a cost‐effective technology alternative.

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Nafion 117 stability under conditions of PEM water electrolysis at elevated temperature and pressure

Cited by 71 publications

References 33 publications

Electrochemical Characterization of a PEMEC Using Impedance Spectroscopy

Electrochemical Characterization of a PEMEC Using Impedance Spectroscopy

Electrochemical Hydrogen Production from SO₂and Water in a SDE Electrolyzer

Review and Prospects of PEM Water Electrolysis at Elevated Temperature Operation

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Nafion 117 stability under conditions of PEM water electrolysis at elevated temperature and pressure

Cited by 71 publications

References 33 publications

Electrochemical Characterization of a PEMEC Using Impedance Spectroscopy

Electrochemical Characterization of a PEMEC Using Impedance Spectroscopy

Electrochemical Hydrogen Production from SO2and Water in a SDE Electrolyzer

Review and Prospects of PEM Water Electrolysis at Elevated Temperature Operation

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Product

Resources

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Electrochemical Hydrogen Production from SO₂and Water in a SDE Electrolyzer