Durability of carbon/conducting polymer composite supported Pt catalysts prepared by supercritical carbon dioxide deposition

Bozkurt, Gamze; Memioğlu, Fulya; Yurtcan, Ayşe Bayrakçeken

doi:10.3906/kim-1502-95

Cited by 12 publications

(10 citation statements)

References 15 publications

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“…The strong bands at 1208 and 1269 cm −1 are attributed to SO 2 , and a strong absorption peak at 1026 cm −1 most probably belongs to 

{SO}_{3}^{-}

[H + ]. The formation of a peak at around 3170 cm −1 shows the protonation of the triazole rings, in addition to the broad peaks around 3500 cm −1 . Similar absorption bands were also present in FTIR spectra as shown in Supporting Information Figures S2 and S3.…”

Section: Resultssupporting

confidence: 64%

Investigation of proton conductivity of anhydrous proton exchange membranes prepared via grafting vinyltriazole onto alkaline-treated PVDF

Sinirlioglu

Müftüoğlu

Gölcük

et al. 2014

J. Polym. Sci. Part A: Polym. Chem.

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This work uses a simple “grafting through” approach in the preparation of anhydrous poly(vinylidene fluoride) (PVDF)‐g‐PVTri polymer electrolyte membranes (PEMs). Alkaline‐treated PVDF was used as a macromolecule in conjunction with vinyltriazole in the graft copolymerization. The obtained polymer was subsequently doped with triflic acid (TA) at different stoichiometric ratios with respect to triazole units and the anhydrous PEMs (PVDF‐g‐PVTri‐(TA)x) were prepared. All samples were characterized by FTIR and 1H NMR. The composition of PVDF‐g‐PVTri was determined by energy dispersive spectroscopy. Thermal properties of the membranes were examined by thermogravimetric analysis and differential scanning calorimetry. The surface roughness and morphology of the membranes were studied using atomic force microscopy, X‐ray diffraction, and scanning electron microscopy. PVDF‐g‐PVTri‐(TA)3 (C3‐TA3) with a degree of grafting of 47.22% showed a maximum proton conductivity of 0.09 S cm−1 at 150 °C and anhydrous conditions. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014, 52, 1885–1897

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“…The strong bands at 1208 and 1269 cm −1 are attributed to SO 2 , and a strong absorption peak at 1026 cm −1 most probably belongs to 

{SO}_{3}^{-}

Section: Resultssupporting

confidence: 64%

Investigation of proton conductivity of anhydrous proton exchange membranes prepared via grafting vinyltriazole onto alkaline-treated PVDF

Sinirlioglu

Müftüoğlu

Gölcük

et al. 2014

J. Polym. Sci. Part A: Polym. Chem.

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“…The integrated hydrogen adsorption and desorption areas of the CV curves provide an estimation of ECSA, which is directly related to the electrooxidation activity of the catalysts. However, the large capacitive current due to double layer charging, made the determination of ECSA extremely difficult, but still, from the average area of hydrogen adsorption/desorption peaks [86–89], the ECSA of Pt/rGO (DMF) and Pt/rGO (HYD) catalysts (in case of fresh electrode) were calculated to be 28.1 and 18.2 m 2 g −1 , respectively. The obtained results showed that the Pt/rGO (DMF) exhibited higher activity than the Pr/rGO (HYD).…”

Section: Resultsmentioning

confidence: 99%

Electrocatalytical Application of Platinum Nanoparticles Supported on Reduced Graphene Oxide in PEM Fuel Cell: Effect of Reducing Agents of Dimethlyformamide or Hydrazine Hydrate on the Properties

2021

Self Cite

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Two kinds of reduced graphene oxide (rGO) were synthesized with the reducing agents of either dimethylformamide (DMF) or hydrazine hydrate (HYD). The decoration of platinum nanoparticles (Pt NPs) over these materials was provided by microwave irradiation (MWI) method. Detailed physical and electrochemical measurements were carried out. Based on the electrochemical results of both catalysts, it is not surprising the achievement of higher electrochemical active surface area (ECSA), higher oxygen reduction reaction (ORR) activity, higher electron transfer number, lower charge transfer resistance and higher fuel cell performance with the Pt/rGO (DMF) catalyst which surpasses Pt/rGO (HYD) in many ways.

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“…The asymmetric and symmetric stretching modes of the CF 3 moiety show up at 1,210 and 1,164 cm -1 . As well, the bands appearing at 632 and 512 cm -1 can be assigned to the anion, caused by the symmetric and asymmetric deformation vibration of the SO 3 moiety [18][19][20]. Thus, only the remaining bands at 573, 728, 910, 1,354, and 1,469 cm -1 are most probably caused by vibration modes of the cation.…”

Section: Uptake Of Pils By M-pbi By a Swelling Processmentioning

confidence: 87%

PBI‐type Polymers and Acidic Proton Conducting Ionic Liquids – Conductivity and Molecular Interactions

Lin

Korte

2020

Fuel Cells

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Proton conducting ionic liquids (PILs) are discussed as new electrolytes for the use as non‐aqueous electrolytes at operation temperatures above 100 °C. During fuel cell operation the presence of significant amounts of residual water is unavoidable. The highly Brønsted‐acidic PIL 2‐Sulfoethylmethylammonum triflate [2‐Sema][TfO] is able to perform fast proton exchange processes with H2O, resulting from 1H‐NMR and pulsed field gradient (PFG)/diffusion ordered spectroscopy (DOSY) self‐diffusion measurements. Proton conduction takes place by a vehicle mechanism via PIL cations or H3O+, but also by a cooperative mechanism involving both species. Thus, highly Brønsted‐acidic PILs are promising candidates for the use as non‐aqueous electrolytes. To use [2‐Sema][TfO] as electrolyte in a proton electrolyte fuel cell (PEFC) it has to be immobilized in a host polymer. There is a (slow) uptake of the PIL by polybenzimidazole (PBI) up to a weight increase of ∼130%, due to a swelling process. A protonation of the basic imidazole moieties takes place. NMR analysis was applied to elucidate the molecular interactions between PBI, PIL, and residual water. Proton exchange, respectively an interaction between the polar groups and water can be observed in spectra, indicating a network of H‐bonds in doped PBI. Therefore, highly acidic PILs are promising candidates for the use as non‐aqueous electrolytes.

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Durability of carbon/conducting polymer composite supported Pt catalysts prepared by supercritical carbon dioxide deposition

Cited by 12 publications

References 15 publications

Investigation of proton conductivity of anhydrous proton exchange membranes prepared via grafting vinyltriazole onto alkaline-treated PVDF

Investigation of proton conductivity of anhydrous proton exchange membranes prepared via grafting vinyltriazole onto alkaline-treated PVDF

Electrocatalytical Application of Platinum Nanoparticles Supported on Reduced Graphene Oxide in PEM Fuel Cell: Effect of Reducing Agents of Dimethlyformamide or Hydrazine Hydrate on the Properties

PBI‐type Polymers and Acidic Proton Conducting Ionic Liquids – Conductivity and Molecular Interactions

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