Flexible and Lightweight Fuel Cell with High Specific Power Density

ACS Nano ◽  
2017 ◽  
Vol 11 (6) ◽  
pp. 5982-5991 ◽  
Author(s):  
Fandi Ning ◽  
Xudong He ◽  
Yangbin Shen ◽  
Hehua Jin ◽  
Qingwen Li ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Power Density ◽  
Specific Power ◽  
High Specific Power ◽  
Specific Power Density

scholarly journals An Overview of Electric Machine Trends in Modern Electric Vehicles

Machines ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 20 ◽  
Author(s):  
Emmanuel Agamloh ◽  
Annette von Jouanne ◽  
Alexandre Yokochi
Keyword(s):  
Power Density ◽  
Electric Vehicles ◽  
Electric Machine ◽  
Specific Power ◽  
Traction Drive ◽  
High Specific Power ◽  
Specific Power Density ◽  
Critical Components ◽  
Drive Systems ◽  
Near Future

Electric machines are critical components of the drivetrains of electric vehicles. Over the past few years the majority of traction drive systems have converged toward containing some form of a permanent magnet machine. There is increasing tendency toward the improvement of power density and efficiency of traction machines, thereby giving rise to innovative designs and improvements of basic machine topologies and the emergence of new classes of machines. This paper provides an overview of present trends toward high specific power density machines for traction drive systems. The focus will be on current technology and the trends that are likely to be pursued in the near future to achieve the high specific power goals set for the industry. The paper discusses machines that are applied in both hybrid and battery electric drivetrains without distinction and does not discuss the associated power electronic inverters. Future electric machine trends that are likely to occur are also projected.

Aqueous Na-ion capacitor with CuS graphene composite in symmetric and asymmetric configurations

2021 ◽  
Vol 45 (37) ◽  
pp. 17592-17602
Author(s):  
Manoj Goswami ◽  
Mattath Athika ◽  
Satendra Kumar ◽  
Perumal Elumalai ◽  
Netrapal Singh ◽  
...  
Keyword(s):  
Energy Density ◽  
Power Density ◽  
Specific Energy ◽  
Specific Power ◽  
Graphene Composite ◽  
Specific Energy Density ◽  
Specific Power Density

The symmetric device shows a maximum specific energy density of 30 W h kg−1 at a specific power density of 380 W kg−1, which was reduced to 4 W h kg−1 at a highest specific power density of 4224 W kg−1.

scholarly journals A Novel Button-Type Micro Direct Methanol Fuel Cell with Graphene Diffusion Layer

Micromachines ◽  
2019 ◽  
Vol 10 (10) ◽  
pp. 658
Author(s):  
Zhu ◽  
Gao ◽  
Li
Keyword(s):  
Fuel Cell ◽  
Power Density ◽  
Direct Methanol Fuel Cell ◽  
Direct Methanol Fuel Cells ◽  
Effective Area ◽  
Unit Weight ◽  
Specific Power ◽  
Large Area ◽  
Direct Methanol ◽  
Methanol Fuel Cell

In order to solve the problem that bolts in traditional packaged direct methanol fuel cells (DMFCs) take up a large area and reduce the specific energy (energy per unit weight) and power density (power per unit area), a new button-type micro direct methanol fuel cell (B-μDMFC) is designed, assembled, and packaged. The cell with four different structures was tested before and after packaging. The results indicate that the button cell with three-dimensional graphene and springs has the best performance. The equivalent circuit and methanol diffusion model was applied to explain the experimental results. The peak volumetric specific power density of the cell is 11.85 mW cm−3. This is much higher than traditional packaged DMFC, because the novel B-μDMFC eliminates bolts in the structure and improves the effective area ratio of the cell.

A Metric for Characterization of Multifunctional Fuel Cell Designs

2011 ◽  
Vol 8 (5) ◽  
Author(s):  
Corydon D. Hilton ◽  
Daniel M. Peairs ◽  
John J. Lesko ◽  
Scott W. Case
Keyword(s):  
Fuel Cell ◽  
Order Theory ◽  
Gas Diffusion ◽  
System Level ◽  
Specific Power ◽  
Structural Cell ◽  
Structural Support ◽  
Model Cell ◽  
Electrical Component ◽  
Specific Power Density

The U.S. Army has investigated a variety of multifunctional designs in order to achieve system level mass and/or volume savings. One of the multifunctional devices developed is the multifunctional fuel cell (MFC)—a fuel cell which simultaneously provides a system with structural support and power generation. However, there are no established methods for measuring how well a particular design performs or its multifunctional advantage. The current paper presents a metric by which multifunctional fuel cell designs can be characterized. The mechanical aspect of the metric is based on the specific bending stiffness of the structural cell and is developed using Frostig’s high-order theory. The electrical component of the metric is based on the specific power density achieved by the structural cell. The structural systems considered here display multifunctional efficiencies ranging from 22% to 69%. The higher efficiency was obtained by optimizing the contact pressure at the gas diffusion layer (GDL) in a model cell design. The efficiencies obtained suggest the need for improved multifunctional designs in order to reach system level mass savings.

Investigation of a Fuel Cell-Powered Blended Wing Body Airliner With Boundary Layer Re-Energization

2002 ◽  
Author(s):  
Vassilios A. Pachidas ◽  
Riti Singh
Keyword(s):  
Boundary Layer ◽  
Fuel Cell ◽  
High Speed ◽  
Preliminary Investigation ◽  
Specific Power ◽  
Fuel Burn ◽  
High Specific Power ◽  
Blended Wing Body ◽  
Center Body

The following study was undertaken on the assumption that hydrocarbon-based fuels may not be acceptable in the very long term, because of environmental concerns. A possible future fuel is hydrogen, and this study explores a novel proposition for a civil airliner using hydrogen fuel. The technical challenges of this preliminary investigation were: a) the integration of an electric power plant (Fuel Cell) into a Blended Wing Body (BWB) aircraft, and b) to investigate the possibility of reducing the aircraft’s profile drag by boundary layer re-energization. For the re-energization of the boundary layer and for propulsion during cruise, the study considered High-Speed/High Specific Power (HS/HSP) motors, situated at the trailing edge (TE) of the center body, driving fans. Re-energizing the boundary layer of the center body, would reduce the profile drag of the aircraft and hence, the total fuel burn. The take-off requirements of the aircraft were met, by high by-pass ratio (BPR) turbofan lift engines, operating on hydrogen, for a V/STOL (Pachidis, 2000b).

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