scholarly journals Towards uniformly distributed heat, mass and charge: A flow field design study for high pressure and high current density operation of PEM electrolysis cells

2019 ◽  
Vol 293 ◽  
pp. 476-495 ◽  
Author(s):  
Anders Christian Olesen ◽  
Steffen Henrik Frensch ◽  
Søren Knudsen Kær
Keyword(s):  
High Pressure ◽  
Flow Field ◽  
Current Density ◽  
High Current Density ◽  
High Current ◽  
Design Study ◽  
Electrolysis Cells ◽  
Pem Electrolysis ◽  
Flow Field Design

scholarly journals Nanocomposite electrodes for high current density over 3 A cm−2 in solid oxide electrolysis cells

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Hiroyuki Shimada ◽  
Toshiaki Yamaguchi ◽  
Haruo Kishimoto ◽  
Hirofumi Sumi ◽  
Yuki Yamaguchi ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Current Density ◽  
High Current Density ◽  
Solid Oxide ◽  
High Current ◽  
Hydrogen Production Rate ◽  
Electrolysis Cells ◽  
Solid Oxide Electrolysis ◽  
Solid Oxide Electrolysis Cells ◽  
Nanocomposite Electrodes

AbstractSolid oxide electrolysis cells can theoretically achieve high energy-conversion efficiency, but current density must be further increased to improve the hydrogen production rate, which is essential to realize widespread application. Here, we report a structure technology for solid oxide electrolysis cells to achieve a current density higher than 3 A cm−2, which exceeds that of state-of-the-art electrolyzers. Bimodal-structured nanocomposite oxygen electrodes are developed where nanometer-scale Sm0.5Sr0.5CoO3−δ and Ce0.8Sm0.2O1.9 are highly dispersed and where submicrometer-scale particles form conductive networks with broad pore channels. Such structure is realized by fabricating the electrode structure from the raw powder material stage using spray pyrolysis. The solid oxide electrolysis cells with the nanocomposite electrodes exhibit high current density in steam electrolysis operation (e.g., at 1.3 V), reaching 3.13 A cm−2 at 750 °C and 4.08 A cm−2 at 800 °C, corresponding to a hydrogen production rate of 1.31 and 1.71 L h−1 cm−2 respectively.

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