Chemical degradation of PFSA ionomer binder in PEMFC's catalyst layer

Kaddouri, Assma El; Flandin, Lionel; Bas, Corine

doi:10.1016/j.ijhydene.2018.06.049

Cited by 10 publications

(3 citation statements)

References 46 publications

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“…Bas et al adopt soxhlet extraction coupled with 19F NMR spectroscopy to probe the ionomer degradation in the catalyst layer. [95] They revealed that the ionomer binder fading originated from the side chain degradation by the H• and/or •OH radical on tertiary CF bond on ionomer backbone or/and cleavage of ether linkage. The ionomer degradation will break the connectivity of the ionomer network and destruct the integrity of three-phase interfaces, resulting in the decrease of ECSA.…”

Section: Carbon Support Corrosionmentioning

confidence: 99%

Materials Engineering toward Durable Electrocatalysts for Proton Exchange Membrane Fuel Cells

Zhao

Zhu

Zheng

et al. 2021

Advanced Energy Materials

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able resource, fossil fuels are being consumed much faster than being formed, bringing a series of serious problems such as petroleum crisis, environmental pollution, and climate change related to greenhouse gases (GHG) emissions. In 2015, under the United Nations Framework Convention on Climate Change, the Paris Agreement was reached to cope with the increasingly serious climate change. The agreement proclaims that the increase in global temperature should be controlled below 2 °C. [1] In this context, renewable energy technology including hydrogen energy, [2] Li-ion batteries, [3] fuel cells, [4] and solar cells [5] are deemed as ideal power sources to substitute conventional internal combustion engine due to the merit of zero GHG emissions.Proton exchange membrane fuel cells (PEMFCs) have attracted rapidly growing attention owing to high power density, high energy-convention efficiency, fast start-up, and zero carbon footprints. In the past decades, PEMFCs have made impressive progress on the development of fuel cell vehicles (FCVs). [4,[6][7][8] For example, Toyota has launched the first commercially mass-produced FCV Mirai in 2014. Now the FCV can deliver a cruise range up to 650 km, as long as any gasoline motor car. However, the retail price of Mirai in the U.S. is high to 57 000 US dollars, [9] much higher than the US Department of Energy (DOE) cost target of US$30 kW -1 for FCVs applications. [10] The main cost contributor is from the high dosage of precious platinum that used at both cathode and anode. As the oxygen reduction reaction (ORR) at cathode is extremely more sluggish than the hydrogen oxidation reaction (HOR) at anode, the cathode materials contribute more to the overall cost. Therefore, the development of high-performance and economical ORR electrocatalysts is of particular importance to reduce the cost of fuel cell-powered vehicles.Tremendous attempts have been focused on exploiting highly active and low-cost catalysts for PEMFCs. Recent years have witnessed significant advances on ORR mechanistic understanding, [11] catalyst design concept, [12] and catalytic activity improvement. [13,14] For example, Duan et al. reported ultrafine jagged Pt nanowires with an excellent mass activity of 13.6 A mg Pt -1 at 0.9 V for ORR, which is nearly 50 times higher than that of commercial Pt/C benchmark. [15] Beyond the Proton exchange membrane fuel cells (PEMFCs) have penetrated many commercial markets, especially in the automotive market as Toyota has launched the first commercially mass-produced fuel cell vehicle, the Mirai in 2014. Electrocatalysts play an irreplaceable role in determining the PEMFCs, performance and account for half of the total cost. Despite substantial progress in exploiting highly active platinum group metal (PGM) and PGM-free electrocatalysts, current electrocatalysts are faced with significant durability challenges, i.e., high-performance electrocatalysts usually suffer from rapid degradation during PEMFC operation. The lifetime of the reported electrocatalysts is far from the ...

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Section: Carbon Support Corrosionmentioning

confidence: 99%

Materials Engineering toward Durable Electrocatalysts for Proton Exchange Membrane Fuel Cells

Zhao

Zhu

Zheng

et al. 2021

Advanced Energy Materials

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“…These stresses can generate mechanical fatigue and lead to the formation and/or growth of cracks or tears [ 43,48 ]. The chemical stresses are mainly due to the action of oxygen (OOH • and HO •) and hydrogen (H •) radicals on the ionomer chemical structure [ 45,[49][50][51][52][53] ]. It is commonly admitted that these radicals are generated by the decomposition of hydrogen peroxide (H2O2).…”

Section: Introductionmentioning

confidence: 99%

Anode defects’ propagation in polymer electrolyte membrane fuel cells

Touhami

Crouillere

Mainka

et al. 2022

Journal of Power Sources

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“…In addition, PFSA ionomers may cause platinum to be separated from the carbon support during fuel cell operation due to the formation of degradation products HF. 40 Therefore, to avoid such problems, the application of hydrocarbon ionomers in fuel cells has also been focused on. 41 For example, Lee 42 group reported the poly(diphenyl-terphenyl-piperidinium) (PDTP) copolymers containing aliphatic chains to reduce the phenyl content and adsorption of the phenyl in the anion-exchange ionomers (AEIs), and improve the mechanical properties of AEM.…”

Section: Introductionmentioning

confidence: 99%

High performance poly(isatin alkyl-terphenyl)s proton exchange membranes with flexible alkylsulfonated side groups

Wang

Guo

et al. 2022

High Performance Polymers

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Hydrocarbon-based polymer proton exchange membranes (PEMs) free of heteroatom linkages are supposed to be an attractive alternative for the most advanced perfluorosulfonic acid PEMs, but it is challenging to synthesize them. Here we disclosed a series of aliphatic chain-containing poly(isatin diphenyl-co-terphenyl)(PIDT) copolymers, which were conveniently prepared by superacid-catalyzed Friedel-Crafts polycondensation. Subsequently, the sulfonated copolymer (SPIDT) membranes were prepared by the grafting of side-chain sulfonic acid groups. Due to the formed continuous and efficient nanoscale proton transport channel, these PEMs exhibited excellent proton conductivity showing 186 mS/cm at 80°C, higher than Nafion115 (150 mS/cm). Meanwhile, the prepared membranes exhibited good oxidative stability. The residual weight of the membranes is still greater than 98 wt % after 1 h immersion in Fenton’s reagent at 80°C. Notably, the direct borohydride-hydrogen fuel cell (DBHFC) equipped with SPIDT-50 membrane as the diaphragm showed the peak power density of 71 mW•cm−2 at 25°C, which was greater than that of Nafion115 (63 mW•cm−2). Therefore, the hydrocarbon-based PEMs prepared in this study show promise for application in fuel cells.

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Chemical degradation of PFSA ionomer binder in PEMFC's catalyst layer

Cited by 10 publications

References 46 publications

Materials Engineering toward Durable Electrocatalysts for Proton Exchange Membrane Fuel Cells

Materials Engineering toward Durable Electrocatalysts for Proton Exchange Membrane Fuel Cells

Anode defects’ propagation in polymer electrolyte membrane fuel cells

High performance poly(isatin alkyl-terphenyl)s proton exchange membranes with flexible alkylsulfonated side groups

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