Improving the corrosion resistance of proton exchange membrane fuel cell carbon supports by pentafluorophenyl surface functionalization

Forouzandeh, Farisa; Li, Xiaoan; Banham, Dustin; Feng, Feng; Kakanat, Abraham Joseph; Ye, Siyu; Birss, Viola I.

doi:10.1016/j.jpowsour.2017.12.008

Cited by 48 publications

(45 citation statements)

References 64 publications

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“…Carbon corrosion is the loss of support material leading to catalyst, ionomer, and conductivity losses and is typically more severe in the cathode compared to the anode. [ 146,329 ] It is a consequence of the electrode environment and the nature of the support material, and in principle can be managed by surface functionalization, [ 69,330 ] choice of support material, [ 74,178,186,225,322–324,329 ] or use of hydrophobic binders. [ 331,332 ] Catalyst loss is typically either driven by the aggregation or migration of the Pt catalyst, causing a loss of ECSA.…”

Section: Catalyst Layer Structurementioning

confidence: 99%

Engineering Catalyst Layers for Next‐Generation Polymer Electrolyte Fuel Cells: A Review of Design, Materials, and Methods

Suter

Smith

Hack

et al. 2021

Advanced Energy Materials

134

115

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Polymer electrolyte fuel cells (PEFCs) are a promising replacement for the fossil fuel–dependent automotive and energy sectors. They have become increasingly commercialized in the last decade; however, significant limitations on durability and performance limit their commercial uptake. Catalyst layer (CL) design is commonly reported to impact device power density and durability; although, a consensus is rarely reached due to differences in testing conditions, experimental design, and types of data reported. This is further exacerbated by aspects of CL design such as catalyst support, proton conduction, catalyst, fabrication, and morphology, being significantly interdependent; hence, a wider appreciation is required in order to optimize performance, improve durability, and reduce costs. Here, the cutting‐edge research within the field of PEFCs is reviewed, investigating the effect of different manufacturing techniques, electrolyte distribution, support materials, surface chemistries, and total porosity on power density and durability. These are critically appraised from an applied perspective to inform the most relevant and promising pathways to make and test commercially viable cells. This holistic view of the competing aspects of CL design and preparation will facilitate the development of optimized CLs, especially the incorporation of novel catalyst support materials.

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Section: Catalyst Layer Structurementioning

confidence: 99%

Engineering Catalyst Layers for Next‐Generation Polymer Electrolyte Fuel Cells: A Review of Design, Materials, and Methods

Suter

Smith

Hack

et al. 2021

Advanced Energy Materials

134

115

View full text Add to dashboard Cite

show abstract

“…Nafion, as a random copolymer, large differences in molecular structure and property between the hydrophilic sulfonic acid group and hydrophobic backbone result in the separation of natural nanophase, [ 1–6 ] which allows forming a prototypical bicontinuous nanophase in NF matrix and a rich nanochannel linkage at its hydrated state, [ 7–12 ] thus transporting proton rapidly in nanochannel by hopping/vehicular. [ 13,14 ] This spatial molecular structure makes NF the most practical PEMs for the fuel cells.…”

Section: Introductionmentioning

confidence: 99%

Surface Enriched Sulfonic Acid Ionic Clusters of Nafion Nanofibers as Long‐Range Interconnected Ionic Nanochannels for Anisotropic Proton Transportation: Phenomenon and Molecular Mechanism

Jin

Yan

Zhao

et al. 2020

Adv Materials Inter

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Construction of long‐range interconnected ionic channels in proton exchange membranes (PEMs) is the key to realize anisotropic proton transportation. But, how to effectively modulate ionic channels at the molecular level still remains a great challenge for modern nanoenergy technology. Here, surface enriched sulfonic acid ionic clusters in Nafion (NF)/ZnO nanofibers are successfully designed and fabricated as long‐range interconnected ionic channels, in which the ZnO nanofiller (nano‐ZnO) act as an inducer to enable the spatial deformation and inversion of sulfonic acid groups in NF molecule from the inside to the surface of the NF/ZnO nanofibers, due to the strong intermolecular electrostatic interactions between nano‐ZnO and the CF2 of NF backbones. The phenomenon and molecular mechanism are visually confirmed by physicochemical analysis. Ultimately, the NF/ZnO nanofibers demonstrate the relative higher of proton conductivity up to 253.2 mS cm‐1 and power density of 115.72 mW cm‐2 than that of reported NF‐based PEMs. This study, for the first time, reveals that the surface enrichment of sulfonic acid ionic clusters is an efficient strategy to construct long‐range interconnected ionic channels in the NF‐based PEMs, proves that the formation of the ionic channels could be efficiently modulated by controlling the molecular activity and morphology of nanofiller.

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“…Direct methanol fuel cells (DMFCs) are considered the ideal fuel cell system for its high energy density, lower noise, quick start time and instant refueling, which have been widely used in portable power sources of cell phone, notebook computers and other electronic devices. [1][2][3] Proton exchange membrane (PEM) is the key component of DMFCs systems and functions as a proton transmitter and fuel separator. As a result, the properties of PEM directly influence the whole performance of DMFCs.…”

Section: Introductionmentioning

confidence: 99%

Sulfonated poly (arylene ether sulfone)-graft-sulfonated poly (vinyl alcohol) proton exchange membranes: Improved proton selectivity

Wang

2020

High Performance Polymers

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Aldehyde terminated sulfonated poly (arylene ether sulfone) (SPAES-CHO) is prepared by a series of nucleophilic substitution reaction based on SPAES in this paper. Novel SPAES-graft-SPVA (SPAES-g-SPVA) membranes are fabricated by acetal reaction between SPAES-CHO and different amounts of sulfonated poly (vinyl alcohol) (SPVA). The 1H-NMR and FTIR indicate the successful preparation of SPAES-CHO and SPAES-g-SPVA membranes. With the introduction of SPVA, the SPAES-g-SPVA membranes have much lower methanol permeability than pure SPAES membrane and Nafion117 membrane. The methanol permeability coefficients of the SPAES-g-SPVA membranes decrease from 3.41 × 10−7 cm2 s−1 to 1.67 × 10−7 cm2 s−1 with the increase of SPVA content. And the proton conductivity of all the membranes is higher than 15 mS cm−1 at 25°C. Moreover, SPAES-g-SPVA membranes exhibit high proton selectivity. Especially, SPAES-g-SPVA-30% membrane has the highest proton selectivity, which is nearly five times higher than Nafion117.

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Improving the corrosion resistance of proton exchange membrane fuel cell carbon supports by pentafluorophenyl surface functionalization

Cited by 48 publications

References 64 publications

Engineering Catalyst Layers for Next‐Generation Polymer Electrolyte Fuel Cells: A Review of Design, Materials, and Methods

Engineering Catalyst Layers for Next‐Generation Polymer Electrolyte Fuel Cells: A Review of Design, Materials, and Methods

Surface Enriched Sulfonic Acid Ionic Clusters of Nafion Nanofibers as Long‐Range Interconnected Ionic Nanochannels for Anisotropic Proton Transportation: Phenomenon and Molecular Mechanism

Sulfonated poly (arylene ether sulfone)-graft-sulfonated poly (vinyl alcohol) proton exchange membranes: Improved proton selectivity

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