An extremely low Pt loading cathode for a highly efficient proton exchange membrane water electrolyzer

Nanoscale ◽  
2017 ◽  
Vol 9 (48) ◽  
pp. 19045-19049 ◽  
Author(s):  
Hoyoung Kim ◽  
Seunghoe Choe ◽  
Hyanjoo Park ◽  
Jong Hyun Jang ◽  
Sang Hyun Ahn ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Current Density ◽  
High Performance ◽  
Proton Exchange Membrane ◽  
High Current Density ◽  
Proton Exchange ◽  
The Self ◽  
High Current ◽  
Low Pt Loading ◽  
Exchange Membrane

The self-terminated electrodeposition (SED) of a Pt cathode with enhanced mass transfer demonstrates high performance of PEMWEs at high current density.

Multimetallic nanostructures for electrocatalytic oxygen evolution reaction in acidic media

2021 ◽  
Author(s):  
Taekyung Kim ◽  
Byeongyoon Kim ◽  
Taehyun Kwon ◽  
Ho Young Kim ◽  
Jin Young Kim ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Current Density ◽  
Oxygen Evolution Reaction ◽  
Proton Exchange Membrane ◽  
High Current Density ◽  
Green Technology ◽  
Proton Exchange ◽  
High Current ◽  
Acidic Media ◽  
Exchange Membrane

The proton exchange membrane water electrolyzer (PEMWE), driven by electrocatalysts, is a promising green technology for producing hydrogen. It provides high current density (0.6–2.0 A/cm2 at 1.75–2.20 V/cell) and high...

The Numerical Study of Geometric Influence of Flow Channel Patterns on Performance of Proton Exchange Membrane Fuel Cells

2012 ◽  
Vol 9 (2) ◽  
Author(s):  
Chiun-Hsun Chen ◽  
Chang-Hsin Chen ◽  
Tang-Yuan Chen
Keyword(s):  
Flow Pattern ◽  
Current Density ◽  
Proton Exchange Membrane ◽  
Numerical Study ◽  
High Current Density ◽  
Proton Exchange ◽  
Bend Angle ◽  
Operating Voltage ◽  
Exchange Membrane ◽  
The Impact

This study numerically investigates how the geometry of flow pattern influences performance of proton exchange membrane fuel cell (PEMFC), and analyzes how these parameters lead to different distributions of model variables. The investigation focuses on the impact of different bend angle and width of serpentine flow channels and tests how they improve the performance. Three-dimensional simulations are carried out with a steady, two-phase, multicomponent and electrochemical model, using CFD-ACE+, the commercial CFD code. Through simulation with various bend angles and widths, the results show that the combination of 60 deg and 120 deg for flow pattern achieves the highest performance at low operating voltage regime, and flow pattern with wider bend width also produces more current at low operating voltages. Plots of current density indicate that high current density locates at the bending areas of the channels. Therefore, the output current densities of each pattern are improved from the change of bend angle and width.

scholarly journals Combining Baffles and Secondary Porous Layers for Performance Enhancement of Proton Exchange Membrane Fuel Cells

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3675
Author(s):  
Luka Mihanović ◽  
Željko Penga ◽  
Lei Xing ◽  
Viktor Hacker
Keyword(s):  
Mass Transfer ◽  
Flow Field ◽  
Heat And Mass Transfer ◽  
High Performance ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Cell Performance ◽  
Manufacturing Cost ◽  
Water Removal ◽  
Exchange Membrane

A numerical study is conducted to compare the current most popular flow field configurations, porous, biporous, porous with baffles, Toyota 3D fine-mesh, and traditional rectangular flow field. Operation at high current densities is considered to elucidate the effect of the flow field designs on the overall heat transfer and liquid water removal. A comprehensive 3D, multiphase, nonisothermal computational fluid dynamics model is developed based on up-to-date heat and mass transfer sub-models, incorporating the complete formulation of the Forchheimer inertial effect and the permeability ratio of the biporous layers. The porous and baffled flow field improves the cell performance by minimizing mass transport losses, enhancing the water removal from the diffusion layers. The baffled flow field is chosen for optimization owing to the simple design and low manufacturing cost. A total of 49 configurations were mutually compared in the design of experiments to show the quantitative effect of each parameter on the performance of the baffled flow field. The results elucidate the significant influence of small geometry modifications on the overall heat and mass transfer. The results of different cases have shown that water saturation can be decreased by up to 33.59% and maximal temperature by 7.91 °C when compared to the reference case which is already characterized by very high performance. The most influencing geometry parameters of the baffles on the cell performance are revealed. The best case of the 49 studied cases is further optimized by introducing a linear scaling factor. Additional geometry modifications demonstrate that the gain in performance can be increased, but at a cost of higher pressure drop and increased design complexity. The conclusions of this work aids in the development of compact and high-performance proton exchange membrane fuel cell stacks.

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