Development of the fuel cell vehicle mirai

Nonobe, Yasuhiro

doi:10.1002/tee.22328

Cited by 158 publications

(61 citation statements)

References 3 publications

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“…Meanwhile, in through‐plane direction, the gas that flows under the BP are forced into GDL under the guidance of the downward slope in the small repeated unit (Figure B), whose effect is a little like the baffles added in traditional flow field. Additionally, the flow pattern simulated in this study is also consistent with the schematic of 3D flow field shown in previous literature . Therefore, the oxygen concentration in cathode porous electrodes (eg, GDL) of PEMFC with 3D fine mesh flow field is higher than that with parallel flow field, as shown in Figure .…”

Section: Resultssupporting

confidence: 89%

“…But its pumping power loss is also much higher in comparison with that of the conventional flow fields. By contrast, Toyota developed the well‐known 3D fine mesh flow field, together with the newly developed membrane electrolyte assembly, the limiting current density of the new PEMFC stack developed by Toyota increased up to 2.4 times compared with that in 2008 . The bipolar plate (BP) for 3D flow field is manufactured in three‐dimensional (3D) space, as shown in Figure A, which is made up of a lot of small repeated units, which are much like the reverted fish scale in shape (Figure B).…”

Section: Introductionmentioning

confidence: 99%

“…The bipolar plate (BP) for 3D flow field is manufactured in three‐dimensional (3D) space, as shown in Figure A, which is made up of a lot of small repeated units, which are much like the reverted fish scale in shape (Figure B). It should be mentioned that the 3D computer‐aided design drawings shown in Figure A,B are generated according to the open publication of Toyota, while the specific sizes are specified by the authors. In 3D fine mesh flow field, there is a narrow gap between two lines, and it is noteworthy that the locations of the small repeated units in two adjacent lines are slightly staggered (Figure A).…”

Section: Introductionmentioning

confidence: 99%

“…By contrast, Toyota developed the well-known 3D fine mesh flow field, 4 together with the newly developed membrane electrolyte assembly, the limiting current density of the new PEMFC stack developed by Toyota increased up to 2.4 times compared with that in 2008. 5 The bipolar plate (BP) for 3D flow field is manufactured in three-dimensional (3D) space, as shown in Figure 1A, which is made up of a lot of small repeated units, which are much like the reverted fish scale in shape ( Figure 1B). It should be mentioned that the 3D computer-aided design drawings shown in Figure 1A,B are generated according to the open publication of Toyota, 4,5 while the specific sizes are specified by the authors.…”

mentioning

confidence: 99%

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Multi-phase simulation of proton exchange membrane fuel cell with 3D fine mesh flow field

et al. 2018

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Summary A three‐dimensional (3D) multi‐phase numerical model of proton exchange membrane fuel cell (PEMFC) is built. The catalyst layer (CL) spherical agglomerate model is used to replace traditional homogenous model, which can predict the concentration loss in PEMFC more accurately. Utilizing this multi‐phase model, the PEMFC with 3D fine mesh flow field is investigated at length, and the liquid water distribution in 3D flow field is qualitatively compared with the experimental image in previous literature. It is found that the 3D fine mesh flow field can improve the reactant gas supply from flow field to porous electrodes significantly and facilitate liquid water removal in PEMFC simultaneously. Therefore, it reduces the concentration loss of PEMFC effectively without increasing the pumping power loss thanks to the greatly increased mass transfer area between gas diffusion layer (GDL) and flow field and vertical flow design of hydrogen and air, which also make the reaction rate distribution in CL more uniform. However, the decreased contact area between GDL and bipolar plate in 3D flow field may decrease PEMFC performance at the current densities where ohmic loss is dominated, but its effect is insignificant.

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Multi-phase simulation of proton exchange membrane fuel cell with 3D fine mesh flow field

et al. 2018

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“…Gaseous hydrogen has a very high energy density in weight, 143 MJ/kg. Total weight of stored hydrogen as gaseous condition is 5.7% of tank weight according to TOYOTA technology (Nonobe 2017). It means 19 kg capacity of tank can store only 1 kg liquid hydrogen, energy density is 7.2 MJ/kg (9.8 MJ/L).…”

Section: Motor Powered Plans By Different Energy Sourcesmentioning

confidence: 99%

Feasibility Study of Motor Powered Agricultural Tractors Based on Physical and Mechanical Properties of Energy Sources

Jing

Noguchi

Ahamed

2018

Agricultural Information Research

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The alternate power utilization instead of Internal Combustion Engine (ICE) in an agricultural tractor (AT) was studied by simulation approach for the drivelines of electric battery (EB), fuel cell (FC) and reformed methanol fuel cell (RMFC). The working hours were considered 4 with comparison of weight, volume, soil pressure, and fuel efficiency. In weight comparison, 12% overweight in FC-AT, 16% overweight in RMFC-AT, and 99% overweight of EB-AT were observed for the rated output power of light duty tractor (17.25 kW). Less than 5% overweight of FC-AT and RMFC-AT, and 39%-62% overweight of EB-AT were observed for rated output power of medium and heavy-duty tractor (33.75-75.00 kW). Soil pressure in the root-growing block was observed less than 130 kPa for EB-AT, FC-AT, RMFC-AT in the rated output power from 17.25-75.00 kW. In all the alternatives, ±5% fluctuations in the volume were observed. In the design stage, we proposed, that FC-AT was the best alternative considering weight, volume, and soil pressure. Furthermore, the analytical software AVL Cruise ® was used for vehicle drive line system to find out how weight affects the performance for 75.00 kW EB-AT. The analysis was designed for 4 working hours with full load at 20 km/h of velocity using AVL Cruise ® . The peak velocity was found less than 14.1 km/h, and constant working time was only 3 hours, because of the severe overweight by EB storage.

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The Elements Selection of High Entropy Alloy Guided by Thermodynamics and the Enhanced Electrocatalytic Mechanism for Oxygen Reduction Reaction

Wang,

Chen,

Yang

et al. 2023

Adv Funct Materials

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Owing to their exceptional properties, high‐entropy alloys (HEAs) have received considerable attention in the field of electrocatalysis. However, few studies focus on the origin of their outstanding performance. Here, carbon‐supported PtFeCoNiMn (with an atomic ratio of 21:20:20:20:19) HEA nanoparticles via shock‐heating and shock‐cooling strategy are rationally designed and successfully prepared. The above five metal elements are rationally selected from the perspective of thermodynamics and geometric effects. Subsequently, the alloying process of the PtFeCoNiMn HEA is investigated via operando X‐ray diffraction characterizations. The electronic structures of each metal atom on the PtFeCoNiMn HEA and monometallic nanoparticles surface are revealed by density function theory calculations for illustrating the performance enhancement mechanism. It is found that Pt atoms on the PtFeCoNiMn HEA surface exhibit a wider range of d‐band center distribution range than the corresponding monometallic nanoparticles, which contributes to the enhanced selective adsorption of O2 reactants/intermediates. Importantly, some Fe, Co, Ni, and Mn atoms on the HEA surface manifest less positive d‐band center values than the corresponding monometallic nanoparticles, with similar d‐band center positions to some Pt atoms. This indicates that the inactive atoms in monometallic nanoparticles can be transformed into ORR active sites in the HEA matrix owing to the electronic interaction between adjacent atoms.

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Development of the fuel cell vehicle mirai

Cited by 158 publications

References 3 publications

Multi-phase simulation of proton exchange membrane fuel cell with 3D fine mesh flow field

Multi-phase simulation of proton exchange membrane fuel cell with 3D fine mesh flow field

Feasibility Study of Motor Powered Agricultural Tractors Based on Physical and Mechanical Properties of Energy Sources

The Elements Selection of High Entropy Alloy Guided by Thermodynamics and the Enhanced Electrocatalytic Mechanism for Oxygen Reduction Reaction

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