Chemical stability enhancement of Nafion membrane by impregnation of a novel organic ·OH radical scavenger, 3,4-dihydroxy-cinnamic acid

Park, Yongman; Kim, Dong Jin

doi:10.1016/j.memsci.2018.08.063

Cited by 49 publications

(24 citation statements)

References 28 publications

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“…While oxides of Mn and Ce ions have been shown to mitigate free radicals 45–47 , Fe and Cu ions are well-known chemical degradation accelerators 48,49 . Other studies incorporated small molecular antioxidants, including Vitamin E 50 , antioxidant 1010 51 , and dihydroxy-cinnamic acid 52 . Among various heteropoly acids, doped SiWA 40 have been reported to be relatively stable to radical degradation, but there appears to be less understanding on approaches to further enhance PEM chemical durability.…”

Section: Introductionmentioning

confidence: 99%

Magnetic field alignment of stable proton-conducting channels in an electrolyte membrane

et al. 2019

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Proton exchange membranes with short-pathway through-plane orientated proton conductivity are highly desirable for use in proton exchange membrane fuel cells. Magnetic field is utilized to create oriented structure in proton exchange membranes. Previously, this has only been carried out by proton nonconductive metal oxide-based fillers. Here, under a strong magnetic field, a proton-conducting paramagnetic complex based on ferrocyanide-coordinated polymer and phosphotungstic acid is used to prepare composite membranes with highly conductive through-plane-aligned proton channels. Gratifyingly, this strategy simultaneously overcomes the high water-solubility of phosphotungstic acid in composite membranes, thereby preventing its leaching and the subsequent loss of membrane conductivity. The ferrocyanide groups in the coordinated polymer, via redox cycle, can continuously consume free radicals, thus helping to improve the long-term in situ membrane durability. The composite membranes exhibit outstanding proton conductivity, fuel cell performance and durability, compared with other types of hydrocarbon membranes and industry standard Nafion® 212.

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Section: Introductionmentioning

confidence: 99%

Magnetic field alignment of stable proton-conducting channels in an electrolyte membrane

et al. 2019

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“…Concerning the chemical stability, radicals such as H 2 O 2 , HO•, and HOO•, generated during the oxygen reduction reaction, deteriorate the membrane's surface, leading to the formation of a pinhole [12][13][14][15]. This issue has been addressed and partially solved through a remarkable achievement: introducing radical scavengers, such as organic chemical species, inorganic nanoparticles, and metal ions, into the electrolyte membranes [16][17][18]. In addition, improving the mechanical properties of the membrane, which highly depend on the inherent material properties, has been extensively studied.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Microscopic/Macroscopic Mechanical Properties of a Thermally Annealed Nafion® Membrane

et al. 2021

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The Nafion® electrolyte membrane, which provides a proton pathway, is an essential element in fuel cell systems. Thermal treatment without additional additives is widely used to modify the mechanical properties of the membrane, to construct reliable and durable electrolyte membranes in the fuel cell. We measured the microscopic mechanical properties of thermally annealed membranes using atomic force microscopy with the two-point method. Furthermore, the macroscopic property was investigated through tensile tests. The microscopic modulus exceeded the macroscopic modulus over all annealing temperature ranges. Additionally, the measured microscopic modulus increased rapidly near 150 °C and was saturated over that temperature, whereas the macroscopic modulus continuously increased until 250 °C. This mismatched micro/macroscopic reinforcement trend indicates that the internal reinforcement of the clusters is induced first until 150 °C. In contrast, the reinforcement among the clusters, which requires more thermal energy, probably progresses even at a temperature of 250 °C. The results showed that the annealing process is effective for the surface smoothing and leveling of the Nafion® membrane until 200 °C.

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“…Cerium ion is considered the best metal ion as a radical scavenger as it bears a unique ability to convert Ce +3 To Ce +4 when exposed to acidic medium and can generate Ce +3 when it is reacted with H 2 O 2 [ 19 ]. It could increase the antioxidation stability of the polymer electrolyte membrane, which may increase the durability for long-term operation, but the excess amounts of polymer could result in a decrease in proton conductivity due to the neutralization of sulfonic acid groups with the positive charge of cerium [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Improved Oxidative Stability by Embedded Cerium into Graphene Oxide Nanosheets for Proton Exchange Membrane Fuel Cell Application

Sharma

Kim

2021

Membranes

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Investigation of the collaborative effect of cerium particles embedded in graphene oxide to enhance the chemical stability of a proton exchange membrane fuel cell (PEMFC) has been carried out. Synthesis of composite membranes (Nafion-GO/Ce-x) with Nafion solution as a polymer is synthesized by a solution casting method where (x = concentration of composite). The developed hybrid material was characterized by FT-IR and X-ray diffraction (XRD) for its phase identification while the chemical structure was characterized by XPS analysis. The enhancement in the chemical stability of the incorporated hybrid material is characterized by Fenton’s test showing a radical scavenging effect. It was found that the residual weight for Nafion 212 was 92.50% after 24 h and it was 94.32% for Nafion-GO/Ce-2 and 96.49% for Nafion-GO/Ce-4, proving the suitability of composite membranes for fuel cell applications.

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Chemical stability enhancement of Nafion membrane by impregnation of a novel organic ·OH radical scavenger, 3,4-dihydroxy-cinnamic acid

Cited by 49 publications

References 28 publications

Magnetic field alignment of stable proton-conducting channels in an electrolyte membrane

Magnetic field alignment of stable proton-conducting channels in an electrolyte membrane

Investigation on the Microscopic/Macroscopic Mechanical Properties of a Thermally Annealed Nafion® Membrane

Improved Oxidative Stability by Embedded Cerium into Graphene Oxide Nanosheets for Proton Exchange Membrane Fuel Cell Application

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