Water movement through an anion exchange membrane fuel cell (AEMFC): Influence of gas humidity and flow rate

León, María I.; Valentín-Reyes, Jonathan; Romero-Castañón, T.; Beltrán, José; Flores-Hernández, José Roberto; Nava, José L.

doi:10.1016/j.apenergy.2022.119722

Cited by 8 publications

(5 citation statements)

References 27 publications

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“…AEMFC operating conditions are quite complex and the cell performance varies with temperature and water activity during the operation. [ 47 ] Consequently, ionic conductivity characteristics of the three membranes were compared under different environmental conditions (i: 80 °C, a = 0.65; ii: 80 °C, a = 0.95; iii: 60 °C, a = 0.65; iv: 60 °C, a = 0.95), as shown in Figure 3e. As a result, the ionic conductivities of the three membranes exhibited poor performance at low water activity (especially at a ≤ 0.65).…”

Section: Resultsmentioning

confidence: 99%

Anion Exchange Membranes for Fuel Cells: Equilibrium Water Content and Conductivity Characterization

Wang

Chen

Han

et al. 2023

Adv Funct Materials

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The ionic conductivity of anion exchange membranes (AEMs) directly determines the performance of anion exchange membrane fuel cells (AEMFCs), which highly depends on the hydration level of the membrane. A better understanding of the relationship between hydration level and membrane ionic conductivity is essential for membrane development and for water and thermal management analyses of AEMFCs. In this study, the effects of water activity and temperature on water uptake, equilibrium water content, and ionic conductivity of three high‐performance AEMs (Alkymer, Orion, and Pention) are quantitatively characterized via the designed experiments. The results show that Orion exhibits the lowest water uptake and highest ionic conductivity among the three membranes at high water activity and Alkymer exhibits good water‐retention capability and the highest ionic conductivity at low water activity. Empirical equations combining water activity and equilibrium water content are proposed based on fitted experimental data to define the hydration level. Empirical equations combining ionic conductivity, equilibrium water content, and temperature are fitted to illustrate the relationship between ionic conductivity and hydration level. The findings of this study can provide solid guidelines and support for the future experimental characterization and water and thermal management analyses of AEMFCs.

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Section: Resultsmentioning

confidence: 99%

Anion Exchange Membranes for Fuel Cells: Equilibrium Water Content and Conductivity Characterization

Wang

Chen

Han

et al. 2023

Adv Funct Materials

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“…In addition, since water is a byproduct during the HOR, maintaining the triple-phase boundary is crucial to prevent flooding, which can occur if water is not quickly removed, increasing the resistance to H 2 transport. 143–147 Additionally, activation operations typically performed before activity tests in RDE systems may not be feasible in the fuel cell system. 148 Therefore, even though catalysts may exhibit excellent performance in RDE tests, their suitability for fuel cell construction depends on their behavior under the specific conditions and requirements of AEMFCs.…”

Section: Fundamentals Of the Alkaline Hormentioning

confidence: 99%

Hydrogen oxidation electrocatalysts for anion-exchange membrane fuel cells: activity descriptors, stability regulation, and perspectives

Ren,

Chen,

Wang

et al. 2024

Energy Environ. Sci.

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“…Generally, the AEMFCs can achieve a larger limiting current density (> 1 A cm -2 ), whereas a large product may not be excluded timely if under such a large current density, resulting in a flooding phenomenon that will increase the resistance for mass and electron transfer [264][265][266] . As a result, water flooding is also a key issue that strictly influences the performance instability of AEMFCs, which makes water management within the cell a prerequisite of high-performance AEMFCs.…”

Section: Fuel Cell Performancesmentioning

confidence: 99%

Recent advances in platinum-group-metal based electrocatalysts for alkaline hydrogen oxidation reaction

Fu,

Wang,

Cai

et al. 2023

Chem Synth

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The reaction kinetics of hydrogen oxidation reactions (HOR) unfavorably decreases by 2~3 orders of magnitude under alkaline conditions, even on the most active platinum-group-metal (PGM) electrocatalysts. This sticky problem severely restricts the efficiency and commercialization of anion-exchange membrane fuel cells (AEMFCs). So far, no other material has HOR electrocatalytic performance comparable to PGM-based electrocatalysts. Forced by the scarce reserves and high prices of PGMs, it is significant to elaborately design and synthesize PGM-based electrocatalysts with ultimately atomic utilization and substantially improved alkaline HOR performance. In this review, we summarize recent advances in the structure engineering approaches to synthesis of advanced PGM-based nanocatalysts toward enhanced alkaline HOR performance. The generally acknowledged catalytic mechanisms with corresponding activity descriptors are reviewed ﬁrstly to deeply understand the discrepancies in the HOR kinetics of alkaline and acidic reactions. Then, several representative strategies are emphasized and discussed at length by changing the chemical and coordination environment and size/morphology of nanocatalysts. Meanwhile, the inﬂuence factors for the performance of AEMFC devices constructed by PGM-based anode catalysts are brieﬂy highlighted. In conclusion, strategies for boosting the electrocatalytic performance and challenges on the roles of catalytic mechanism insights and practical AEMFC applications are finally outlined. We hope this review will guide the design and catalytic mechanism research of novel PGM-based alkaline HOR catalysts, thereby promoting their further development and application in AEMFC technologies.

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Water movement through an anion exchange membrane fuel cell (AEMFC): Influence of gas humidity and flow rate

Cited by 8 publications

References 27 publications

Anion Exchange Membranes for Fuel Cells: Equilibrium Water Content and Conductivity Characterization

Anion Exchange Membranes for Fuel Cells: Equilibrium Water Content and Conductivity Characterization

Hydrogen oxidation electrocatalysts for anion-exchange membrane fuel cells: activity descriptors, stability regulation, and perspectives

Recent advances in platinum-group-metal based electrocatalysts for alkaline hydrogen oxidation reaction

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