An anode catalyst support for polymer electrolyte membrane fuel cells: application of organically modified titanium and silicon dioxide

Malinowski, M.; Iwan, Agnieszka; Hreniak, Agnieszka; Tazbir, Igor

doi:10.1039/c9ra04862f

Cited by 13 publications

(10 citation statements)

References 30 publications

(36 reference statements)

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“…The BET surface area of QPPO@Pt/C and PPOAN@Pt/C was reduced to 58.3 and 91.3 m 2 g À1 respectively, essentially because the more viscous ionomer solution entered the pores of the multiporous catalyst and blocked them when mixed with the catalyst particles. 56,57 This reduced the exposed active catalytic sites and catalytic activity of Pt/C. In addition, the plugged pores also increased the resistance to gas transfer, making it difficult to transfer oxygen to the TPB.…”

Section: Scheme 1 Schematic Of the Anthracene Group Crosslinking Immo...mentioning

confidence: 99%

UV-crosslinkable anthracene-based ionomer derived gas “Expressway” for anion exchange membrane fuel cells

et al. 2022

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Section: Scheme 1 Schematic Of the Anthracene Group Crosslinking Immo...mentioning

confidence: 99%

UV-crosslinkable anthracene-based ionomer derived gas “Expressway” for anion exchange membrane fuel cells

et al. 2022

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“…where σ is the contact angle and γ the surface tension of 0.0302 J m −2 and 0.0353 J m [83][84][85][86][87][88], a centrifugal effect on the ILs is not expected because r c > r.…”

Section: Influence Of Centrifugal Forcesmentioning

confidence: 99%

“…Since grinding alters the bead shape of Vulcan ® XC72, the resulting CB after grinding is comparable to the powdered Vulcan ® XC72R with an average particle size of 50 nm, a density of 96 kg m −3 , and A BET = 222 m 2 g −1 . A more detailed description of the physical properties of Vulcan ® XC72 and XC72R is given in [83][84][85][86][87][88]95,96]. A total pore volume of V total = 0.76 cm 3 g −1 was determined by N 2 adsorption using an Autosorb iQ 2 (Quantachrome, Boynton Beach, FL, USA) equipped with a cryocooler (CTI-cryogenics, Waltham, MA, USA).…”

Section: Sample Preparation and Characterizationmentioning

confidence: 99%

MAS-NMR of [Pyr13][Tf2N] and [Pyr16][Tf2N] Ionic Liquids Confined to Carbon Black: Insights and Pitfalls

et al. 2021

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Electrolytes based on ionic liquids (IL) are promising candidates to replace traditional liquid electrolytes in electrochemical systems, particularly in combination with carbon-based porous electrodes. Insight into the dynamics of such systems is imperative for tailoring electrochemical performance. In this work, 1-Methyl-1-propylpyrrolidinium bis(trifluoromethylsulfonyl)imide and 1-Hexyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide were studied in a carbon black (CB) host using spectrally resolved Carr-Purcell-Meiboom-Gill (CPMG) and 13-interval Pulsed Field Gradient Stimulated Echo (PFGSTE) Magic Angle Spinning Nuclear Magnetic Resonance (MAS-NMR). Data were processed using a sensitivity weighted Laplace inversion algorithm without non-negativity constraint. Previously found relations between the alkyl length and the aggregation behavior of pyrrolidinium-based cations were confirmed and characterized in more detail. For the IL in CB, a different aggregation behavior was found compared to the neat IL, adding the surface of a porous electrode as an additional parameter for the optimization of IL-based electrolytes. Finally, the suitability of MAS was assessed and critically discussed for investigations of this class of samples.

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“…BET and BJH isotherms were used to evaluate the surface area and porosity of the surfaces [65]. The surface area, pore volume and pore size improvements contribute to the reaction rate by increasing the active sites via larger exposure of catalysts to the reactants in the three-phase boundary region [66].…”

Section: Characterization Of the Cathode/electrolyte Systemsmentioning

confidence: 99%

Microwave irradiation synthesis to obtain La0.7-xPrxCa0.3MnO3 perovskites: Electrical and electrochemical performance

Ferrel-Álvarez

Domínguez‐Crespo

Cong

et al. 2021

Journal of Alloys and Compounds

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La0.7-xPrxCa0.3MnO3 (LPCM) perovskites previously synthesized by the microwave-assisted method at 4 minutes and with different stoichiometry (x=0.35, 0.52 and 0.63) were evaluated through thermogravimetric analysis (TGA), electrical conductivity, thermal expansion coefficient (TEC), scanning electron microscopy (SEM), Brunauer-Emmet-Teller (BET) analysis and electrochemical impedance spectroscopy (EIS) using yttria stabilized zirconia (YSZ) as an electrolyte. The results are discussed in terms of the potential as cathode material to be applied in solid oxide fuel cells (SOFCs) applications at temperatures from 600 to 800 °C. Results derived from TGA showed that Pr promotes the uncoupling oxygen and oxygen vacancies favoring the fuel combusting. Also, TEC analysis revealed adequate stability between the YSZ electrolyte and the La0.7-xPrxCa0.3MnO3 to avoid cracking or failing, especially with high amount of Pr. The transition in morphology from irregular to regular shapes improves the BET and Barret-Joyner-Halenda (BJH) surfaces and promotes the triple phase boundary (TPB) connectivity. The electrical conductivity correlated to the availability in oxygen vacancies showed maximum conductivities in the order of 10 -2 S cm -1 . Activation energy (Ea) was found to be reduced with a minimum quantity of Pr (0.071 eV). EIS results indicate that the oxygen vacancies in the LPCM/YSZ system were better promoted with the highest amount of Pr= 0.63 (=0.9 V, 800 °C and 0.06 V of amplitude) in comparison with the minimum, Pr=0.35 (=1.2 V, 800 °C and 0.06 V of amplitude).

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An anode catalyst support for polymer electrolyte membrane fuel cells: application of organically modified titanium and silicon dioxide

Abstract: TiO2 and SiO2 act successfully as an anode support material despite their poor electrical properties providing the improvement of fuel cell electrochemical parameters.

Cited by 13 publications

References 30 publications

UV-crosslinkable anthracene-based ionomer derived gas “Expressway” for anion exchange membrane fuel cells

UV-crosslinkable anthracene-based ionomer derived gas “Expressway” for anion exchange membrane fuel cells

MAS-NMR of [Pyr13][Tf2N] and [Pyr16][Tf2N] Ionic Liquids Confined to Carbon Black: Insights and Pitfalls

Microwave irradiation synthesis to obtain La0.7-xPrxCa0.3MnO3 perovskites: Electrical and electrochemical performance

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