Composite Membranes Using Hydrophilized Porous Substrates for Hydrogen Based Energy Conversion

Lim, Seohee; Park, Jin-Soo

doi:10.3390/en13226101

Cited by 6 publications

(3 citation statements)

References 38 publications

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“…[11,12] However, incomplete impregnation of the ionomer into the PTFE sheet through the conventional blade-coating method using a highly viscous PFSA solution results in interfacial incompatibility between hydrophilic ionomers and hydrophobic PTFE fibers. [13][14][15] Therefore, it reduces proton transport and mechanical durability and increases high-reactant gas crossover. Notably, thinner membranes exacerbate the gas crossover issue and accelerate radical (e.g., HO•, HOO•) generation through the Fentons' reaction of chemical species of dissolved metal ions (e.g., Fe 2+ ) and H 2 O 2 .…”

Section: Introductionmentioning

confidence: 99%

Construction of PTFE/Nafion Composite Membrane with Ultrathin Graphene Oxide Layer for Durable Fuel Cells

Choi,

Kang,

Jang

et al. 2023

Adv Materials Technologies

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The long‐term operation of polymer electrolyte membrane fuel cells (PEMFCs) relies heavily on the durability of the perfluorinated sulfonic acid (PFSA, e.g., Nafion) membrane against chemical and mechanical degradation. To mitigate mechanical degradation, the introduction of a reinforcing matrix, such as a porous PTFE sheet, is employed. However, completely impregnating the PFSA ionomer into the PTFE sheet through the conventional blade‐coating method using a highly viscous ionomer solution proves challenging. This limitation results in decreased mechanical and proton transport properties. To reduce proton transport resistance, thinner membrane thickness is desirable, although it increases the amount of gas crossover, which generates radicals and accelerates the chemical degradation of the membrane. In this study, a spraying process utilizing a low viscous‐solvent‐rich ionomer solution is experimentally optimized to construct a well‐impregnated PTFE/Nafion membrane and analyzed using a simple theoretical droplet‐spreading model. Furthermore, an ultrathin graphene oxide (GO) layer is introduced during the membrane fabrication process with the same spraying technique for reducing gas crossover while minimizing performance loss. The membrane electrode assembly (MEA) with the prepared PTFE/Nafion membrane‐incorporated ultrathin GO layer shows significantly greater durability and initial performance compared to the conventional MEA.

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Section: Introductionmentioning

confidence: 99%

Construction of PTFE/Nafion Composite Membrane with Ultrathin Graphene Oxide Layer for Durable Fuel Cells

Choi,

Kang,

Jang

et al. 2023

Adv Materials Technologies

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“…Meanwhile, proton-exchange membranes (PEMs) are one of the core components determining the performance and price of PEMFCs. The PEMs have been developed to possess high proton conductivity, low fuel diffusion, excellent chemical and thermal stabilities, good mechanical strength, and low manufacturing cost [4,5].…”

Section: Introductionmentioning

confidence: 99%

Pore-Filled Proton-Exchange Membranes with Fluorinated Moiety for Fuel Cell Application

Song

Park

et al. 2021

Energies

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Proton-exchange membrane fuel cells (PEMFCs) are the heart of promising hydrogen-fueled electric vehicles, and should lower their price and further improve durability. Therefore, it is necessary to enhance the performances of the proton-exchange membrane (PEM), which is a key component of a PEMFC. In this study, novel pore-filled proton-exchange membranes (PFPEMs) were developed, in which a partially fluorinated ionomer with high cross-linking density is combined with a porous polytetrafluoroethylene (PTFE) substrate. By using a thin and tough porous PTFE substrate film, it was possible to easily fabricate a composite membrane possessing sufficient physical strength and low mass transfer resistance. Therefore, it was expected that the manufacturing method would be simple and suitable for a continuous process, thereby significantly reducing the membrane price. In addition, by using a tri-functional cross-linker, the cross-linking density was increased. The oxidation stability was greatly enhanced by introducing a fluorine moiety into the polymer backbone, and the compatibility with the perfluorinated ionomer binder was also improved. The prepared PFPEMs showed stable PEMFC performance (as maximum power density) equivalent to 72% of Nafion 212. It is noted that the conductivity of the PFPEMs corresponds to 58–63% of that of Nafion 212. Thus, it is expected that a higher fuel cell performance could be achieved when the membrane resistance is further lowered.

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“…Energy conversion devices being developed recently require polymeric electrolytes for ion conduction [1][2][3][4][5][6][7][8][9][10][11][12][13], which are generally called ion-exchange membranes (IEMs). IEMs have a special property to exclude coions which have the same charge to covalently fixed functional groups such as sulfonic acid groups for cation exchange membranes (CEMs) or quaternary ammonium groups for anion exchange membranes (AEMs).…”

Section: Introductionmentioning

confidence: 99%

Fouling Mitigation of Ion Exchange Membranes in Energy Conversion Devices

Kim

Park

2021

Energies

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In this study, three different environmentally friendly fouling mitigation technologies are suggested and are investigated in reverse electrodialysis (RED) to develop the most appropriate fouling mitigation technology for RED: applying direct current, flowing a solution with high salt concentration, and periodically switching river and seawater streams in RED. The quantitative level of anion exchange membrane fouling mitigation is evaluated in terms of the power density and the amount of power generation of RED. Applying a direct current electric field with higher voltage than 8 V was not allowed for fouling mitigation in the two-cell-pair bench RED stack due to decomposition of the redox couple. In comparison of the RED operations with two different fouling mitigation methods using firstly 40-min power generation during in-operation and 40-min fouling mitigation stage during out-of-operation as a cycle for 80 min and secondly 80-min forward power generation and 80-min backward power generation as two cycles. It was found that, over five cycles, the amount of the RED power generation using the former fouling mitigation method is 1.7 times higher than RED power generation using the latter fouling mitigation method.

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Composite Membranes Using Hydrophilized Porous Substrates for Hydrogen Based Energy Conversion

Cited by 6 publications

References 38 publications

Construction of PTFE/Nafion Composite Membrane with Ultrathin Graphene Oxide Layer for Durable Fuel Cells

Construction of PTFE/Nafion Composite Membrane with Ultrathin Graphene Oxide Layer for Durable Fuel Cells

Pore-Filled Proton-Exchange Membranes with Fluorinated Moiety for Fuel Cell Application

Fouling Mitigation of Ion Exchange Membranes in Energy Conversion Devices

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