Effects of the operation mode on the degradation behavior of anion exchange membrane water electrolyzers

Niaz, Atif Khan; Akhtar, Adil; Park, Jun-Young; Lim, Hyung‐Tae

doi:10.1016/j.jpowsour.2020.229093

Cited by 39 publications

(39 citation statements)

References 39 publications

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“….55 Acm -2 . This initial performance improvement was due to the MEA activation as observed in previous studies [26][27][28][29][30]. On the other hand, the cell performance appeared to be about the same or slightly degraded when the initial and final values were compared, as shown in Fig.…”

Section: Resultssupporting

confidence: 77%

“…to the impedance and I-V curve measurement timing associated with the bubble resistance [26]. The gradual decrease in the current density in Fig.…”

Section: Resultsmentioning

confidence: 90%

“…Note that the small fluctuation in the current density was due to switching the peristaltic pump on and off every 20 min during the test; the current density increased when the pump was stopped, and then it decreased with restating the pump. Note that switching the pump on and off every 20 min did not influence the cell stability [26]. Fig.…”

Section: Resultsmentioning

confidence: 94%

“…The stability of AEMWE can be affected by various aspects, such as membrane types [18], catalysts and binder materials (platinum group metals or transition metal oxides, etc.) [9,11,23], solution types (electrolyte or D.I water) [11,20], feeding modes (anode or cathode side) [24][25] and operation modes (continuous or periodic) [26], etc. In most studies, voltage increase rates (or current density drop rate) at a fixed current density (or a fixed voltage) were determined by merely comparing the initial and the final voltages (or current densities), but this does not provide detailed information of changes in electrochemical performances of AEMWE cells.…”

Section: Introductionmentioning

confidence: 99%

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Tracing Resistances of Anion Exchange Membrane Water Electrolyzer during Long-term Stability Tests

Niaz

Lee

Yang

et al. 2021

J. Electrochem. Sci. Technol

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In this study, an anion exchange membrane water electrolysis (AEMWE) cell was operated for ~1000 h at a voltage bias of 1.95 V. Impedance spectra were regularly measured every ~ 100 h, and changes in the ohmic and non-ohmic resistance were traced as a function of time. While there was relatively little change in the I-V curves and the total cell resistance during the long-term test, we observed various electrochemical phenomena in the cell: 1) initial activation with a decrease in both ohmic and non-ohmic resistance; 2) momentary and non-permanent bubble resistance (non-ohmic resistance) depending on the voltage bias, and 3) membrane degradation with a slight increase in the ohmic resistance. Thus, the regular test protocol used in this study provided clear insights into the performance degradation (or improvement) mechanism of AEMWE cells.

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Section: Resultssupporting

confidence: 77%

“…to the impedance and I-V curve measurement timing associated with the bubble resistance [26]. The gradual decrease in the current density in Fig.…”

Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Tracing Resistances of Anion Exchange Membrane Water Electrolyzer during Long-term Stability Tests

Niaz

Lee

Yang

et al. 2021

J. Electrochem. Sci. Technol

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“…Cell degradation occurs within a short period, but this degradation is recoverable. Change in the liquid electrolyte concentration or water transport issues due to evolving gas 81 may cause such voltage behavior. Fig.…”

Section: Cell Voltage Behaviors During An Extended-term Testmentioning

confidence: 99%

Durability of anion exchange membrane water electrolyzers

Motz

Bae

et al. 2021

Energy Environ. Sci.

277

263

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Hybrid PV Systems – Optimizing CPV and SiPV Ratio to Increase Sustainability of Hydrogen Production

Boulaire,

Love,

Mohammadshahi

et al. 2024

Advanced Sustainable Systems

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This paper establishes the concept of hybrid PV systems where the ratio of different photovoltaic (PV) technologies is optimized so that their combined output profile best matches user requirements. The method is presented and applied to a case study where a two‐axis tracking concentrating photovoltaic (CPV) and a single‐axis silicon photovoltaic (SiPV) system installed at a sub‐tropical location in Australia, are to power the production of hydrogen by electrolysis. The analysis quantifies the performance of the PV systems from data gathered at the site and reveals the complementarity of these two systems in their output at different timescales. An optimization problem is then defined that seeks the optimal ratio of CPV and SiPV to achieve high annual power output and, importantly, a good match between power supply and demand profiles. The benefits of this approach are illustrated for a green hydrogen power‐to‐gas‐to‐power plant under two operating modes. For this case study, the optimal PV ratio of 0.33CPV: 0.67SiPV leads to reduced dependence on the electricity grid, and a maximum guaranteed minimal take‐up of hydrogen over all months in a year. Overall, the sustainability of the plant is increased without the need for additional storage, and therefore additional resources.

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Effects of the operation mode on the degradation behavior of anion exchange membrane water electrolyzers

Cited by 39 publications

References 39 publications

Tracing Resistances of Anion Exchange Membrane Water Electrolyzer during Long-term Stability Tests

Tracing Resistances of Anion Exchange Membrane Water Electrolyzer during Long-term Stability Tests

Durability of anion exchange membrane water electrolyzers

Hybrid PV Systems – Optimizing CPV and SiPV Ratio to Increase Sustainability of Hydrogen Production

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