Development of High-Performance FC Stack for the New MIRAI

Yoshizumi, Takuma; Kubo, Hideki; Okumura, Masao

doi:10.4271/2021-01-0740

Cited by 93 publications

(67 citation statements)

References 6 publications

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“…With the help of adhesive, the MEA frame can be directly bonded with s form an assembly, i.e., so-called unit cell in a series patents of Toyota Mot adhesive used in the unit cell can be cured with hot pressing, ultraviolet ( adhesive, or ultrasonic welding procedures. The process time of a unit cell can from minutes to seconds by the application of UV-curing process [27].…”

Section: Frame Bonded With Separator Platementioning

confidence: 99%

See 1 more Smart Citation

A Review of the Transition Region of Membrane Electrode Assembly of Proton Exchange Membrane Fuel Cells: Design, Degradation, and Mitigation

Yang

Tan

et al. 2022

Membranes

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As the core component of a proton exchange fuel cell (PEMFC), a membrane electrode assembly (MEA) consists of function region (active area), structure region, and transition region. Situated between the function and structure regions, the transition region influences the reliability and durability of the MEA. The degradation of the electrolyte membrane in this region can be induced by mechanical stress and chemical aggression. Therefore, prudent design, reliable and robust structure of the transition region can greatly help avoid early failure of MEAs. This review begins with the summarization of current structural concepts of MEAs, focusing on the transition region structures. It can be seen that aiming at better repeatability and robustness, partly or total integration of the materials in the transition region is becoming a development trend. Next the degradation problem at the transition region is introduced, which can be attributed to the hygro-thermal environment, free radical aggression, air pressure shock, and seal material decomposition. Finally, the mitigation approaches for the deterioration at this region are summarized, with a principle of avoiding the exposure of the membrane at the edge of the catalyst-coated membrane (CCM). Besides, durability test methods of the transition region are included in this review, among which temperature and humidity cycling are frequently used.

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Section: Frame Bonded With Separator Platementioning

confidence: 99%

“…The adhesive used in the unit cell can be cured with hot pressing, ultraviolet (UV)-curable adhesive, or ultrasonic welding procedures. The process time of a unit cell can be reduced from minutes to seconds by the application of UV-curing process [ 27 ].…”

Section: Structure Of Transition Regionmentioning

confidence: 99%

A Review of the Transition Region of Membrane Electrode Assembly of Proton Exchange Membrane Fuel Cells: Design, Degradation, and Mitigation

Yang

Tan

et al. 2022

Membranes

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“…Honda used 130 kW fuel cells in the Clarity model, for which the volumetric and mass power factors were 3.1 kW/dm 3 and 2.0 kW/kg [27,28].…”

Section: Analysis Of Hydrogen Usage In Internal Combustion Engines and Fuel Cellsmentioning

confidence: 99%

Fuel Cell Electric Vehicle (FCEV) Energy Flow Analysis in Real Driving Conditions (RDC)

Szałek¹,

Pielecha

Cieślik

2021

Energies

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The search for fossil fuels substitutes forces the use of new propulsion technologies applied to means of transportation. Already widespread, hybrid vehicles are beginning to share the market with hydrogen-powered propulsion systems. These systems are fuel cells or internal combustion engines powered by hydrogen fuel. In this context, road tests of a hydrogen fuel cell drive were conducted under typical traffic conditions according to the requirements of the RDE test. As a result of the carried-out work, energy flow conditions were presented for three driving phases (urban, rural and motorway). The different contributions to the vehicle propulsion of the hydrogen system and the electric system in each phase of the driving route are indicated. The characteristic interaction of power train components during varying driving conditions was presented. A wide variation in the contribution of the fuel cell and the battery to the vehicle’s propulsion was identified. In urban conditions, the share of the fuel cell in the vehicle’s propulsion is more than three times that contributed by the battery, suburban—7 times, highway—28 times. In the entire test, the ratio of FC/BATT use was more than seven, while the energy consumption was more than 22 kWh/100 km. The amounts of battery energy used and recovered were found to be very close to each other under RDE test conditions.

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“…Often the performance measured in a RDE setup cannot be translated to corresponding improvements in MEA measurements and there is a large gap between fundamental research and applications. [9] Therefore, it is of interest to systematically compare the performance of the Pt/C catalysts as determined by RDE measurements with their performance in GDE measurements. In previous work of our and other groups, the TKK 46 wt.…”

Section: Electrochemical Catalyst Characterization: Rde Vs Gdementioning

confidence: 99%

“…This limits the transferability of results gained with an RDE setup towards an application in fuel cells. There is a lack of evidence that high performing fuel cell catalysts measured with the RDE setup can unfold their full potential in membrane electrode assemblies (MEAs) that constitute a fuel cell [7] [8] [9].…”

Section: Introductionmentioning

confidence: 99%

The Gas diffusion electrode setup as a testing platform for evaluating fuel cell catalysts: a comparative RDE-GDE study

Nösberger

Quinson

et al. 2021

Preprint

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Gas diffusion electrode (GDE) setups have been recently introduced as a new experimental approach to test the performance of fuel cell catalysts. As compared to the state-of-the-art in fundamental research, i.e., rotating disk electrode (RDE) measurements, GDE measurements offer several advantages. Most importantly mass transport limitations, inherent to RDE measurements are avoided. In a GDE setup the reactant, e.g., oxygen gas, is not dissolved into a liquid electrolyte but distributed through a gas diffusion layer (GDL), as it is actually the case in fuel cells. Consequently, much higher current densities can be achieved, and the catalysts can be studied in a wider and more relevant potential range. Furthermore, direct contact to a liquid electrolyte can be avoided and elevated temperatures can be employed in a straight-forward manner. However, the use of GDE setups also comes with some challenges. The determined performance is not strictly related to the catalyst itself (intrinsic activity), but also to the quality of the catalyst film preparation. Therefore, it might be even more important than in RDE testing to develop standardized procedures to prepare catalysts inks and films that can be reproduced effortlessly in research laboratories for fundamental and applied experimentation. To develop such standardized testing protocols, we present a comparative RDE – GDE study, where we investigate several commercial standard Pt/C fuel cell catalysts with respect to the oxygen reduction reaction (ORR). The study highlights the strengths of the GDE approach as an intermediate “testing step” between RDE and membrane electrode assembly (MEA) tests when developing new fuel catalysts.

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Development of High-Performance FC Stack for the New MIRAI

Cited by 93 publications

References 6 publications

A Review of the Transition Region of Membrane Electrode Assembly of Proton Exchange Membrane Fuel Cells: Design, Degradation, and Mitigation

A Review of the Transition Region of Membrane Electrode Assembly of Proton Exchange Membrane Fuel Cells: Design, Degradation, and Mitigation

Fuel Cell Electric Vehicle (FCEV) Energy Flow Analysis in Real Driving Conditions (RDC)

The Gas diffusion electrode setup as a testing platform for evaluating fuel cell catalysts: a comparative RDE-GDE study

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