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.

Nanosized Mo-doped CeO2 enhances the electrocatalytic properties of the Pt anode catalyst in direct methanol fuel cells

2017 ◽  
Vol 5 (4) ◽  
pp. 1481-1487 ◽  
Author(s):  
Genlei Zhang ◽  
Zhenzhen Yang ◽  
Wen Zhang ◽  
Yuxin Wang
Keyword(s):  
Fuel Cell ◽  
Power Density ◽  
Direct Methanol Fuel Cell ◽  
Direct Methanol Fuel Cells ◽  
State Of The Art ◽  
Anode Catalyst ◽  
Direct Methanol ◽  
Methanol Fuel Cells ◽  
Doped Ceo2 ◽  
Methanol Fuel Cell

A novel Pt/Ce0.7Mo0.3O2−δ–C electrocatalyst has been developed for methanol oxidation. A direct methanol fuel cell integrating this catalyst as the anode catalyst showed superior power density compared to that with a state-of-the-art commercial Pt/C-JM catalyst.

Direct methanol fuel cell modeling based on the norm optimal iterative learning control

2020 ◽  
Vol 235 (1) ◽  
pp. 68-79
Author(s):  
Nastaran Shakeri ◽  
Zahra Rahmani ◽  
Abolfazl Ranjbar Noei ◽  
Mohammadreza Zamani
Keyword(s):  
Fuel Cell ◽  
Iterative Learning Control ◽  
Direct Methanol Fuel Cell ◽  
Direct Methanol Fuel Cells ◽  
Learning Control ◽  
Iterative Learning ◽  
Operating Conditions ◽  
Primary Model ◽  
Direct Methanol ◽  
Methanol Fuel Cell

Direct methanol fuel cells are one of the most promisingly critical fuel cell technologies for portable applications. Due to the strong dependency between actual operating conditions and electrical power, acquiring an explicit model becomes difficult. In this article, the behavioral model of direct methanol fuel cell is proposed with satisfactory accuracy, using only input/output measurement data. First, using the generated data which are tested on the direct methanol fuel cell, the frequency response of the direct methanol fuel cell is estimated as a primary model in lower accuracy. Then, the norm optimal iterative learning control is used to improve the estimated model of the direct methanol fuel cell with a predictive trial information algorithm. Iterative learning control can be used for controlling systems with imprecise models as it is capable of correcting the input control signal in each trial. The proposed algorithm uses not only the past trial information but also the future trials which are predicted. It is found that better performance, as well as much more convergence speed, can be achieved with the predicted future trials. In addition, applying the norm optimal iterative learning control on the proposed procedure, resulted from the solution of a quadratic optimization problem, leads to the optimal selection of the control inputs. Simulation results demonstrate the effectiveness of the proposed approach by practical data.

Evaluation of the Performance Characteristics of a Direct Methanol Fuel Cell With Multifuels

2010 ◽  
Vol 7 (4) ◽  
Author(s):  
Sujith Mohan ◽  
S. O. Bade Shrestha
Keyword(s):  
Fuel Cell ◽  
Direct Methanol Fuel Cell ◽  
Direct Methanol Fuel Cells ◽  
Operating Temperature ◽  
High Energy ◽  
High Energy Density ◽  
Power Sources ◽  
Transport Losses ◽  
Direct Methanol ◽  
Methanol Fuel Cell

Direct methanol fuel cells are one of the alternate power sources for the field of power electronics because of their high energy density. The benefits of a fuel cell toward the environment can be greatly improved if the fuel used for its application comes from renewable sources. In this study, the performance of a direct methanol fuel cell was investigated under five different methanol concentrations. The effect of methanol concentration on the cell operating temperature is studied. Impedance spectroscopy was conducted to measure the ohmic, activation, and mass transport losses for all concentrations. The cell performance was evaluated using methane and ethanol fuels and this was compared with methanol operation.

Evaluation of the Performance Characteristics of a Direct Methanol Fuel Cell With Multi Fuels

2009 ◽  
Author(s):  
Sujith Mohan ◽  
S. O. Bade Shrestha
Keyword(s):  
Fuel Cell ◽  
Direct Methanol Fuel Cell ◽  
Direct Methanol Fuel Cells ◽  
Operating Temperature ◽  
High Energy ◽  
High Energy Density ◽  
Power Sources ◽  
Transport Losses ◽  
Direct Methanol ◽  
Methanol Fuel Cell

Direct methanol fuel cells are one of the alternate power sources for the field of power electronics because of their high energy density. The benefits of a fuel cell towards the environment can be greatly improved if the fuel used for its application comes from renewable sources. In this study, the performance of a direct methanol fuel cell was investigated under five different methanol concentrations. The effect of methanol concentration on the cell operating temperature is studied. Impedance spectroscopy was conducted to measure the ohmic, activation and mass transport losses for all concentrations. The cell performance was evaluated using methane and ethanol fuels and this was compared with methanol operation.

Development of MEMS-based direct methanol fuel cell with high power density using nanoimprint technology

2007 ◽  
Vol 9 (6) ◽  
pp. 1365-1368 ◽  
Author(s):  
Yi Zhang ◽  
Jian Lu ◽  
Satoshi Shimano ◽  
Haoshen Zhou ◽  
Ryutaro Maeda
Keyword(s):  
Fuel Cell ◽  
Power Density ◽  
High Power ◽  
Direct Methanol Fuel Cell ◽  
High Power Density ◽  
Direct Methanol ◽  
Methanol Fuel Cell

The Effect of Cell Temperature and Channel Geometry on the Performance of a Direct Methanol Fuel Cell

2011 ◽  
Vol 8 (6) ◽  
Author(s):  
Mojtaba Parvizi Omran ◽  
Mousa Farhadi ◽  
Kurosh Sedighi
Keyword(s):  
Fuel Cell ◽  
Power Density ◽  
Direct Methanol Fuel Cell ◽  
Species Conservation ◽  
Channel Width ◽  
Limiting Current ◽  
Electrochemical Kinetics ◽  
Cell Temperature ◽  
Direct Methanol ◽  
Methanol Fuel Cell

A 3D, single phase steady-state model has been developed for liquid feed direct methanol fuel cell. The model is implemented into the commercial computational fluid dynamics (CFD) software package FLUENT® v6.2, with its user-defined functions (UDFs). The continuity, momentum, and species conservation equations are coupled with electrochemical kinetics in the anode and cathode channel and MEA. For electro chemical kinetics, the Tafel equation is used at both the anode and cathode sides. Results are validated against DMFC experimental data with reasonable agreement and used to study the effects of cell temperature, channel depth, and channel width on polarization curve, power density and crossover rate. The results show that the increasing operational temperature, the limiting current density and peak of power density increase and subsequently crossover increases too. It is also shown that the increasing of channel width is a beneficial way for improving cell performance at a methanol concentration below 1 M.

Performance Analysis of a Direct Methanol Fuel Cell Stack With Bipolar Plate Incorporated With Innovative Flow-Field Combination

2014 ◽  
Vol 11 (3) ◽  
Author(s):  
Chia-Chieh Shen ◽  
Guo-Bin Jung ◽  
Feng-Bor Weng ◽  
Chia-Chen Yeh ◽  
Chih-Hung Lee ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Direct Methanol Fuel Cell ◽  
Direct Methanol Fuel Cells ◽  
Bipolar Plate ◽  
Published Data ◽  
Bipolar Plates ◽  
Operating Characteristics ◽  
Direct Methanol ◽  
The Impact ◽  
Methanol Fuel Cell

Increasing interest in utilizing direct methanol fuel cells for portable applications has prompted the need for understanding of their operating characteristics. Approximately 80% of a direct methanol fuel cell stack's volume and weight arise from the bipolar plates. The bipolar plates have grooved anode and cathode flow fields, and have a critical influence on the cell stack performance and stability. However, there is little published data regarding design expansion from single cell to stack, and literature regarding the fuel/oxidant distribution in each cell is especially scant. Hence, this topic is the subject of the present study, which reports the design of a complete direct methanol fuel cell consisting of five single cells including a graphite bipolar plate, as well as an innovative anode and cathode flow channel design. By observing variations in operating parameters, such as applied load and the flow of methanol solution and air, the impact of each parameter on the output performance and stability of the stack was investigated.

scholarly journals Design and Optimization of a Hyper-Branched Polyimide Proton Exchange Membrane with Ultra-High Methanol-Permeation Resistivity for Direct Methanol Fuel Cells Applications

Polymers ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1175 ◽  
Author(s):  
Liying Ma ◽  
Guoxiao Xu ◽  
Shuai Li ◽  
Jiao Ma ◽  
Jing Li ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Composite Membrane ◽  
Direct Methanol Fuel Cell ◽  
Polyvinylidene Fluoride ◽  
Proton Exchange Membrane ◽  
Direct Methanol Fuel Cells ◽  
Proton Exchange ◽  
Direct Methanol ◽  
Methanol Fuel Cell ◽  
Methanol Permeation

A hyper-branched sulfonated polyimide (s-PI) was synthesized successfully and composited with polyvinylidene fluoride (PVDF) to achieve ultra-high methanol-permeation resistive for direct methanol fuel cell application. The optimized s-PI-PVDF composite membrane exhibited methanol resistivity low to 1.80 × 10−8 cm2/s, two orders of magnitude lower than the value of the commercial Nafion 117 membrane (60 × 10−7 cm2/s). At the same time, the tensile strength of the composite membrane is 22 MPa, which is comparable to the value of the Nafion 117 membrane. Therefore, the composite membrane is promising for application in direct methanol fuel cell.

A Novel Design of a Cylindrical Portable Direct Methanol Fuel Cell

2008 ◽  
Vol 5 (3) ◽  
Author(s):  
Ming-San Lee ◽  
Long-Jeng Chen ◽  
Min-Fa Hung ◽  
Ming-Yuan Lo ◽  
Shan-Jay Sue ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Direct Methanol Fuel Cell ◽  
Membrane Electrode Assembly ◽  
Specific Power ◽  
Membrane Electrode ◽  
Direct Methanol ◽  
One Step ◽  
Compact Design ◽  
Novel Design ◽  
Methanol Fuel Cell

Novel designs of a cylindrical and a flat portable direct methanol fuel cell (DMFC) have been proposed in this research. Experimental cells have also been fabricated. Their maximum power output reached 12mW∕cm2 when operating at room temperature and with naturally breathed air. The weight and the volume of the experimental cylindrical cell are 27g and 30cm3, respectively, with 7.5cm3 of methanol inside. Its specific power and volumetric power density are 6.67mW∕g and 6.25mW∕cm3, respectively. The membrane electrode assembly was fabricated by hot pressing the electrodes purchased from E-Tek Co. The catalyst contents are 4.0mg∕cm2 of Pt∕Ru (80wt.% carbon supported) and 4.0mg∕cm2 of Pt (black) for anode and cathode, respectively. The new and compact design will make the portable DMFC lighter and cheaper, and bring it one step closer to be marketable.

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