A new hydrophobic thin film catalyst layer for PEMFC

Song, Wei; Yu, Hongmei; Hao, Lixing; Miao, Zhili; Yi, Baolian; Shao, Zhigang

doi:10.1016/j.ssi.2010.01.022

Cited by 44 publications

(32 citation statements)

References 36 publications

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“…The Nafion/PVDF and Nafion/PAA cathode MEAs generated similar polarization curves, with the Nafion/PVDF cathode MEA having slightly higher current densities at voltages < 0.65 V (associated with better water expulsion at high current densities) and slightly smaller current densities at voltages > 0.65 V (insufficient water at the catalyst surface sites for fast ORR 23 ). With regards to the former observation, an improvement in cathode mass transfer due to an increase in binder hydrophobicity has been reported previously by Song et al 24 who found that an MEA with a cathode binder composed of 5 wt% polytetrafluoroethylene (PTFE) and 95% Nafion had lower ORR catalytic activity, but produced more power at low voltages (e.g. ∼20% more power at 0.4 V, as compared to a standard Nafion binder MEA).…”

Section: Resultssupporting

confidence: 59%

Power Output and Durability of Electrospun Fuel Cell Fiber Cathodes with PVDF and Nafion/PVDF Binders

Brodt

Dale

Pintauro

2016

J. Electrochem. Soc.

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Membrane-electrode-assemblies (MEAs) with electrospun nanofiber mat electrodes (0.10 mg/cm 2 Pt loading) and a Nafion 211 membrane were prepared and tested in a H 2 /air fuel cell at 100% and 40% relative humidity. The cathode binder was either neat poly(vinylidene fluoride) (PVDF) or a Nafion/PVDF blend (20 to 80 wt% Nafion) and the anode binder was Nafion with poly(acrylic acid). Polarization curves were recorded at 80 • C and ambient pressure before, intermittently, and after a carbon corrosion voltage cycling experiment. The Nafion/PVDF cathode MEA with the smallest amount of PVDF (80/20 Nafion/PVDF weight ratio) produced the highest maximum power at beginning-of-life (BoL), 545 mW/cm 2 at 100% RH, which was 35% greater than that for a conventional MEA with a neat Nafion binder. Carbon corrosion scaled inversely with cathode PVDF content, with a 33/67 Nafion/PVDF cathode binder MEA producing the highest end-of-life (EoL) power (330 mW/cm 2 ). MEAs with < 50 wt% PVDF in the cathode binder exhibited a power density decline during carbon corrosion, whereas the power increased during/after carbon corrosion for nanofiber cathodes with binders containing > 50 wt% PVDF due to favorable increases in the hydrophilicity of the carbon support and Pt mass activity, coupled with a lower carbon loss. The hydrogen/air proton-exchange membrane fuel cell is a promising candidate for emission-free automotive power plants, but issues remain regarding the high cost and durability of membrane-electrodeassemblies (MEAs).1 For commercialization, the Pt loading of fuel cell MEAs (particularly the cathode) must be reduced while maintaining high power output and the catalytic activity of the cathode for electrochemical oxygen reduction must be maintained during long-term operation with various power cycles and numerous stack start-ups and shut-down events. 2In a series of recent papers, Pintauro and coworkers have shown that an electrospun nanofiber cathode, composed of Pt/C particles and a binder of Nafion + poly(acrylic acid) (abbreviated as PAA) performs remarkably well in a hydrogen/air proton exchange membrane fuel cell.3-5 For example, a nanofiber electrode MEA with 0.055 mg Pt /cm 2 at the cathode and 0.059 mg Pt /cm 2 at the anode (Johnson Matthey Pt/C catalyst) produced more than 900 mW/cm 2 at maximum power in a H 2 /air fuel cell at 80• C, 100% RH, and high feed gas flow rates at 2 atm backpressure. 4 In a recent collaborative study between Vanderbilt University and Nissan Technical Center North America, Brodt et al. 5 showed that MEAs with an electrospun particle/polymer cathode generated high beginning-of-life power and also exhibited excellent durability, as determined from end-of-life polarization curves after an accelerated start-stop voltage cycling (carbon corrosion) test. Thus, after 1,000 simulated start-stop cycles, a nanofiber MEA with Johnson Matthey Pt/C catalyst and a binder of Nafion + PAA maintained 53% of its initial power at 0.65 V and 85% of its maximum power, as compared to a 28% power retention at 0.65...

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Section: Resultssupporting

confidence: 59%

Power Output and Durability of Electrospun Fuel Cell Fiber Cathodes with PVDF and Nafion/PVDF Binders

Brodt

Dale

Pintauro

2016

J. Electrochem. Soc.

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show abstract

“…Due to its low dielectric constant, THF showed better performance than IPA as the solvent in the catalyst inks, while EG and glycerol led to poor performance [5]. Song et al [6] investigated the effect of PTFE content in the CL; results indicated that adding certain PTFEs could improve the concentration polarization of the CL. The optimal PTFE content was 5 wt%, which did not affect the charge transfer resistance but improved the internal mass diffusion of the CL [6].…”

Section: Introductionmentioning

confidence: 99%

“…Song et al [6] investigated the effect of PTFE content in the CL; results indicated that adding certain PTFEs could improve the concentration polarization of the CL. The optimal PTFE content was 5 wt%, which did not affect the charge transfer resistance but improved the internal mass diffusion of the CL [6]. Pore former can modify the pore volume.…”

Section: Introductionmentioning

confidence: 99%

Ultra-low Pt loading for proton exchange membrane fuel cells by catalyst coating technique with ultrasonic spray coating machine

Huang

Shen

Jao

et al. 2012

International Journal of Hydrogen Energy

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“…The impact of hot-pressing temperature on the MEAs performance can be deduced by comparing the polarization curves of each pair of Run (1) vs. Run (5), Run (2) vs. Run (6), Run (3) vs. Run (7), and Run (4) vs. Run (8) which are illustrated in Fig. 3.…”

Section: Impact Of Temperature On the Meas Performancementioning

confidence: 99%

Effects of hot pressing conditions on the performance of Nafion membranes coated by ink-jet printing of Pt/MWCNTs electrocatalyst for PEMFCs

Yazdanpour

Esmaeilifar

Rowshanzamir

2012

International Journal of Hydrogen Energy

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A new hydrophobic thin film catalyst layer for PEMFC

Cited by 44 publications

References 36 publications

Power Output and Durability of Electrospun Fuel Cell Fiber Cathodes with PVDF and Nafion/PVDF Binders

Power Output and Durability of Electrospun Fuel Cell Fiber Cathodes with PVDF and Nafion/PVDF Binders

Ultra-low Pt loading for proton exchange membrane fuel cells by catalyst coating technique with ultrasonic spray coating machine

Effects of hot pressing conditions on the performance of Nafion membranes coated by ink-jet printing of Pt/MWCNTs electrocatalyst for PEMFCs

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