The influence of anion-exchange membrane nanostructure onto ion transport: Adjusting membrane performance through fabrication conditions

Fischer, Lukas; Hartmann, Sven Sören; Maljusch, Artjom; Däschlein, Christian; Prymak, Oleg; Ulbricht, Mathias

doi:10.1016/j.memsci.2022.121306

Cited by 12 publications

(11 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We found that the usual technique of IEC determination by titration can result in errors that are too large to reliably determine low values of IEC. 50 Therefore, the membrane samples were first incubated in 0.1 M NaBr for 24 h and, afterward, washed three times with DI water. Then, the samples were placed in 0.1 M NaOH for 24 h to exchange all bromide anions bound in the membrane.…”

Section: Water Contact Anglementioning

confidence: 99%

Highly Nickel Loaded Nanocomposite Membranes for Catalytic H₂ Production and Hydrogenation of p-Nitrophenol Using Ammonia Borane

Fischer

Hesaraki

Volz

et al. 2023

ACS Appl. Nano Mater.

Self Cite

View full text Add to dashboard Cite

Herein, we successfully fabricated porous nanocomposite membranes decorated with high loadings of nickel nanoparticles (25–45 wt %) by using chelating additives (sodium dodecyl sulfate (SDS) and Fumion) for the film casting cum phase separation approach. These additives decreased the nickel agglomeration and promoted the presentation of particles at the pore surface of the final membranes, leading to increased water permeances (450 to 1200–2400 L/m2 hbar) and porosities (56% to 70–78%) in comparison to a nanocomposite membrane made without additives. The hydrophobic ionomer Fumion, incorporated into the polyethersulfone matrix during solidification, further allowed us to tune the membrane hydrophobicity. We discovered that the same nickel nanoparticles exhibited a 5× increased H2 generation rate during the catalytic hydrogen formation from ammonia borane when presented in a membrane with a higher water contact angle (85° compared to 60°). We could attribute this improvement to the lower capillary pressure in more hydrophobic pores, which facilitates the release of H2 bubbles. The nanocomposite membranes were further employed as flow-through reactors for the catalytic hydrogenation of p-nitrophenol (p-NP) in the presence of ammonia borane. Membranes with an additive-directed nickel nanoparticle presentation at the pore surface demonstrated 6 to 7× higher p-NP turnover frequencies (TOFs). We also observed that the formation of hydrogen gas from ammonia borane results in a permeance decrease during the flow-through p-NP conversion. However, this effect was mitigated in more hydrophilic membranes with an anisotropic pore structure.

show abstract

Section: Water Contact Anglementioning

confidence: 99%

Highly Nickel Loaded Nanocomposite Membranes for Catalytic H₂ Production and Hydrogenation of p-Nitrophenol Using Ammonia Borane

Fischer

Hesaraki

Volz

et al. 2023

ACS Appl. Nano Mater.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The porous membrane structure obtained through the DMD approach possibly enhanced water permeability through offering more connected hydrophilic domains. 26 Greater water permeability and removal can decrease hydraulic and Maxwell pressures acting to drive water into the BPM interface, which decreases the chance of blistering and delamination. 38 The composite AEM|CEM structure also reduces water buildup in the f-BPM.…”

mentioning

confidence: 99%

“…The manually air brushed membrane showed ∼6.6 μm in total thickness (Figure S14). The difference in membrane thickness obtained through automatic spray coating and manual air brushing indicates that the deposition method can affect the final membrane density and free volume . A less dense membrane has more connected hydrophilic domains that enable higher ion diffusion and conductivity (Figure S14), which could explain the lower full-cell potential observed for the automatic spray coated membrane (Figure c).…”

mentioning

confidence: 99%

“…The difference in membrane thickness obtained through automatic spray coating and manual air brushing indicates that the deposition method can affect the final membrane density and free volume. 26 A less dense membrane has more connected hydrophilic domains that enable higher ion diffusion and conductivity (Figure S14), 26 which could explain the lower full-cell potential observed for the automatic spray coated membrane (Figure 2c). Fourier transform infrared (FTIR) spectroscopy showed no change in CEM structure between automatically spray coated and manually air brushed membranes (Figure S15).…”

mentioning

confidence: 99%

“…These experiments implied that the AEM|CEM interface is better interlinked when the samples are sprayed and dried slowly at room temperature, ensuring that the wet CEM infiltrates the voids at the top of the AEM surface. The morphology and porosity of the sprayed membranes have been previously reported to be impacted by solvent selection and drying temperature. − We hypothesized that the microscale integration of the polymers in the interface layer (through phase segregation, interface thickness, and morphology) also impacts ion and mass transport and overall BPM performance …”

mentioning

confidence: 99%

See 2 more Smart Citations

Direct Membrane Deposition for CO₂ Electrolysis

Alkayyali,

Zeraati,

Mar

et al. 2023

ACS Energy Lett.

View full text Add to dashboard Cite

The use of forward-bias bipolar membranes (f-BPM) in CO2 electrolyzers offers the advantage of avoiding costly CO2 reactant loss. However, current f-BPM-based electrolyzers require a high voltage and produce H2 at the expense of CO2 reduction products. In this work, we develop a direct membrane deposition (DMD) approach that combines anion and cation exchange membranes (AEM and CEM, respectively) to increase transport and facilitate CO2 regeneration. The DMD approach provides flexibility to tune the properties of the composite and optimize the AEM:CEM ratio for low resistance and low H2 evolution. Compared to a standard f-BPM, the DMD approach reduced the H2 Faradaic efficiency by 2-fold (25% vs 12%, respectively), reduced mass transport resistance by over 50%, decreased full-cell potential by 0.84 V, increased the selectivity toward multicarbon products by over 2-fold (29% vs 65%, respectively), and achieved >17% in multicarbon product energy efficiency at 300 mA cm–2.

show abstract

Transport of Hydrogen Through Anion Exchange Membranes in Water Electrolysis

Klinger,

Strobl,

Michaels

et al. 2024

Adv Materials Inter

View full text Add to dashboard Cite

The transport of hydrogen through an anion‐exchange membrane (AEM) is analyzed by in‐line product gas analysis in a large dynamic range (0.1–2 Acm−2) at ambient pressure and correlated to ex situ membrane properties, including volumetric electrolyte uptake, dimensional swelling and diffusivities. A commercial AF3‐HWK9‐75‐X membrane from Ionomr Innovations Inc. is characterized and employed in a 25 cm2 electrolyzer cell, which is operated for 56 h at 60 °C in 1 M KOH solution. A model of the membrane is developed, based on a combination of existing theoretical knowledge regarding liquid electrolytes and measured properties of the membrane. The model is employed to quantify the transport parameters through the membrane and the porous electrode. The hydrogen transport through the membrane is 770 times slower than through the electrode. The anion‐exchange membrane permits a low degree of gas crossover, with a hydrogen‐in‐oxygen concentration of at 2 Acm−2. The model indicates that modifying the membrane's microstructure has a more pronounced effect on the gas crossover than altering the swollen thickness. A correlation is derived to estimate the polymer diffusivity from the derived effective diffusivity through the membrane, which allows the determination of preferred membrane properties to lower hydrogen crossover.

show abstract

The influence of anion-exchange membrane nanostructure onto ion transport: Adjusting membrane performance through fabrication conditions

Cited by 12 publications

References 56 publications

Highly Nickel Loaded Nanocomposite Membranes for Catalytic H₂ Production and Hydrogenation of p-Nitrophenol Using Ammonia Borane

Highly Nickel Loaded Nanocomposite Membranes for Catalytic H₂ Production and Hydrogenation of p-Nitrophenol Using Ammonia Borane

Direct Membrane Deposition for CO₂ Electrolysis

Transport of Hydrogen Through Anion Exchange Membranes in Water Electrolysis

Contact Info

Product

Resources

About

The influence of anion-exchange membrane nanostructure onto ion transport: Adjusting membrane performance through fabrication conditions

Cited by 12 publications

References 56 publications

Highly Nickel Loaded Nanocomposite Membranes for Catalytic H2 Production and Hydrogenation of p-Nitrophenol Using Ammonia Borane

Highly Nickel Loaded Nanocomposite Membranes for Catalytic H2 Production and Hydrogenation of p-Nitrophenol Using Ammonia Borane

Direct Membrane Deposition for CO2 Electrolysis

Transport of Hydrogen Through Anion Exchange Membranes in Water Electrolysis

Contact Info

Product

Resources

About

Highly Nickel Loaded Nanocomposite Membranes for Catalytic H₂ Production and Hydrogenation of p-Nitrophenol Using Ammonia Borane

Highly Nickel Loaded Nanocomposite Membranes for Catalytic H₂ Production and Hydrogenation of p-Nitrophenol Using Ammonia Borane

Direct Membrane Deposition for CO₂ Electrolysis