Effect of PTFE nanoparticles in catalyst layer with high Pt loading on PEM fuel cell performance

Avcioglu, Gökçe S.; Fıçıcılar, Berker; Eroğlu, İnci

doi:10.1016/j.ijhydene.2016.03.048

Cited by 42 publications

(40 citation statements)

References 28 publications

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“…The PEMFC membrane electrode assembly (MEA) performance significantly depends on not only on the activity and EASA of the catalysts, but also on the catalytic layer structure and thickness. For instance, a thinner catalytic layer (with a higher Pt content) provides a better mass transfer and lower charge transfer resistance within the active layer [42][43][44]. Layers with a Pt content gradient structure have also been proposed [45].…”

Section: Introductionmentioning

confidence: 99%

Reduced Graphene Oxide-Supported Pt-Based Catalysts for PEM Fuel Cells with Enhanced Activity and Stability

et al. 2021

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Platinum (Pt)-based electrocatalysts supported by reduced graphene oxide (RGO) were synthesized using two different methods, namely: (i) a conventional two-step polyol process using RGO as the substrate, and (ii) a modified polyol process implicating the simultaneous reduction of a Pt nanoparticle precursor and graphene oxide (GO). The structure, morphology, and electrochemical performances of the obtained Pt/RGO catalysts were studied and compared with a reference Pt/carbon black Vulcan XC-72 (C) sample. It was shown that the Pt/RGO obtained by the optimized simultaneous reduction process had higher Pt utilization and electrochemically active surface area (EASA) values, and a better performance stability. The use of this catalyst at the cathode of a proton exchange membrane fuel cell (PEMFC) led to an increase in its maximum power density of up to 17%, and significantly enhanced its performance especially at high current densities. It is possible to conclude that the optimized synthesis procedure allows for a more uniform distribution of the Pt nanoparticles and ensures better binding of the particles to the surface of the support. The advantages of Pt/RGO synthesized in this way over conventional Pt/C are the high electrical conductivity and specific surface area provided by RGO, as well as a reduction in the percolation limit of the components of the electrocatalytic layer due to the high aspect ratio of RGO.

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Section: Introductionmentioning

confidence: 99%

Reduced Graphene Oxide-Supported Pt-Based Catalysts for PEM Fuel Cells with Enhanced Activity and Stability

et al. 2021

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“…Furthermore, the results obtained with the catalyst solution containing the FEP polymer supported the results obtained for the PTFE polymer. However, they suggested that FEP may be more advantageous due to higher hydrophilic properties than PTFE nanoparticles . Ozturk et al prepared the MPL layer of the fuel cell using two different molecular weight polydimethylsiloxane (PDMS) (PDMS‐1, 236.53 g/mol) and PDMS (PDMS‐2, 117.000 g/mol), PTFE, and FEP as hydrophobic polymers.…”

Section: Introductionmentioning

confidence: 99%

“…However, they suggested that FEP may be more advantageous due to higher hydrophilic properties than PTFE nanoparticles. 11,12 Ozturk et al prepared the MPL layer of the fuel cell using two different molecular weight polydimethylsiloxane (PDMS) (PDMS-1, 236.53 g/mol) and PDMS (PDMS-2, 117.000 g/mol), PTFE, and FEP as hydrophobic polymers. The performance of the cells including the FEP polymer was not satisfactory.…”

Section: Introductionmentioning

confidence: 99%

PEMFC catalyst layer modification with the addition of different amounts of PDMS polymer in order to improve water management

Ungan

Yurtcan

2019

Int J Energy Res

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Summary The balance between preventing water flooding and adequate humidification of the membrane will provide a significant contribution to proton exchange membrane (PEM) fuel cell performance. For this purpose, polydimethylsiloxane (PDMS), a hydrophobic polymer, was added to the catalyst layer of the fuel cell at different amounts including 5, 10, and 20 wt%. The performances of the fuel cells including PDMS were compared with the commercial catalyst. Morphological changes of the gas diffusion electrodes (GDEs) were confirmed by using scanning electron microscopy (SEM). Fourier transformation infrared spectroscopy (FTIR) was used to determine the functional groups and contact angle measurements were used to determine the hydrophobic characteristics. Cyclic voltammetry (CV), impedance, and oxygen reduction reaction (ORR) analysis were performed for electrochemical characterization and degradation behaviors. In situ PEM fuel cell tests were performed in order to define the best catalyst ink combination that include PDMS. The results of the cyclic voltammograms proved that the electrochemical surface area (ECSA) increased with the increasing amount of PDMS. The highest ECSA of 53.84 m2 g−1 was calculated for catalyst ink with 20‐wt% PDMS. The lowest ECSA loss after aging was observed in the catalyst ink with 10‐wt% PDMS. As a result, the catalyst layer having 10‐wt% PDMS showed the best polymer electrolyte membrane fuel cells (PEMFC) performance.

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“…Avcioglu et al reported that the cell performance they obtained by adding 5, 10, 20, and 30 wt.% PTFE was 76, 64, 35, and 33 mA/cm 2 , respectively. They argued that as the PTFE amount increased, the Pt and carbon structures were isolated by PTFE nanoparticles, thereby reducing Pt use and decreasing performance [43]. Performance tests for different humidification temperatures showed that the MEAs prepared were unsuitable for the operation at 50 °C.…”

Section: Resultsmentioning

confidence: 99%

Water management improvement in PEM fuel cells via addition of PDMS or APTES polymers to the catalyst layer

Ungan

Yurtcan

2020

Turk J Chem

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Water management is one of the obstacles in the development and commercialization of proton exchange membrane fuel cells (PEMFCs). Sufficient humidification of the membrane directly affects the PEM fuel cell performance. Therefore, 2 different hydrophobic polymers, polydimethylsiloxane (PDMS) and (3-Aminopropyl) triethoxysilane (APTES), were tested at different percentages (5, 10, and 20 wt.%) in the catalyst layer. The solution was loaded onto the surface of a 25 BC gas diffusion layer (GDL) via the spraying method. The performance of the obtained fuel cells was compared with the performance of the commercial catalyst. Characterizations of each surface, including different amounts of PDMS and APTES, were performed via scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX) analyses. Molecular bond characterization was examined via Fourier transform infrared spectroscopy (FTIR) analysis and surface hydrophobicity was measured via contact angle measurements. The performance of the fuel cells was evaluated at the PEM fuel cell test station and the 2 hydrophobic polymers were compared. Surfaces containing APTES were found to be more hydrophobic. Fuel cells with PDMS performed better when compared to those with APTES. Fuel cells with 5wt.% APTES with a current density of 321.31 mA/cm2and power density of 0.191 W/cm2, and 10wt.% PDMS with a current density of 344.52 mA/cm2and power density of 0.205 W/cm2 were the best performing fuel cells at 0.6V.

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Effect of PTFE nanoparticles in catalyst layer with high Pt loading on PEM fuel cell performance

Cited by 42 publications

References 28 publications

Reduced Graphene Oxide-Supported Pt-Based Catalysts for PEM Fuel Cells with Enhanced Activity and Stability

Reduced Graphene Oxide-Supported Pt-Based Catalysts for PEM Fuel Cells with Enhanced Activity and Stability

PEMFC catalyst layer modification with the addition of different amounts of PDMS polymer in order to improve water management

Water management improvement in PEM fuel cells via addition of PDMS or APTES polymers to the catalyst layer

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