Computational analysis of operating temperature, hydrogen flow rate and anode thickness in anode-supported flat-tube solid oxide fuel cells

Abstract The output voltage of Solid Oxide Fuel Cell (SOFC) is usually changed with the temperature and hydrogen flow rate. Since the fuel cell can generate a wide range of voltages and currents at the terminals, as a consequence, a constant DC voltage and function cannot be maintained by itself as a DC voltage power supply source. To solve this problem, a simple SOFC electrochemical model is introduced to control the output voltage. The Sliding Mode Control (SMC) is used to control the output voltage of the DC-DC converter for maintaining the constant DC voltage when the temperature and hydrogen flow rate are changed. By the simulation results it can be seen that the SMC technique has improved the transient response and reduced the steady state error of DC voltage.

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Study of a Fuel Supply Pump With a Piezoelectric Effect for Micro Solid Oxide Fuel Cells

Volume 8: Energy Systems: Analysis, Thermodynamics and Sustainability; Sustainable Products and Processes ◽

10.1115/imece2008-67150 ◽

2008 ◽

Author(s):

H. K. Ma ◽

S. H. Huang ◽

B. R. Chen ◽

Y. J. Huang

Keyword(s):

Fuel Cells ◽

Solid Oxide Fuel Cells ◽

Flow Rate ◽

Solid Oxide ◽

Injection System ◽

Oxide Fuel ◽

Fuel Injector ◽

Ethanol Injection ◽

Piezoelectric Device ◽

Pump Chamber

A novel design for an ethanol injection system has been proposed, which consists of the fuel injector, two valves, one pump chamber, and one piezoelectric device (central vibration). The system uses a micro-diaphragm pump with a piezoelectric device for the micro solid oxide fuel cells (SOFC), which operate at a low temperature (550 to 600 °C) and are supplied by Enerage Inc. The diameters of the pump chamber are 31 mm and 23mm, and the depths of the chamber are 1 mm and 2 mm. When the piezoelectric device actuates for changing pump chamber volume, the valves will be opened/closed, and the ethanol will be delivered into SOFC system due to its pressure variation. The dimensions of the injector chamber, vibration frequencies of piezoelectric (PZT) device, input voltages, and valve thickness and shape, are used as important parameters for the performance of the novel ethanol injection system. The experimental results show that the ethanol flow rate can reach 170ml/min at a piezoelectric device frequency of 75Hz. In addition, the ethanol flow rate is higher than the water flow rate.

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Achieving Performance and Longevity with Butane-operated Low-temperature Solid Oxide Fuel Cells using Low-Cost Cu and CeO2 Catalysts

Journal of Materials Chemistry A ◽

10.1039/d1ta06922e ◽

2021 ◽

Author(s):

Cam-Anh Thieu ◽

Sungeun Yang ◽

Ho-Il Ji ◽

Hyoungchul Kim ◽

Kyung Joong Yoon ◽

...

Keyword(s):

Thin Film ◽

Fuel Cells ◽

Low Temperature ◽

Solid Oxide Fuel Cells ◽

High Efficiency ◽

Operating Temperature ◽

Low Cost ◽

Solid Oxide ◽

Oxide Fuel

Thin-film solid oxide fuel cells (TF-SOFCs) effectively lower the operating temperature of typical solid oxide fuel cells (SOFCs) below 600 °C, while maintaining high efficiency and using low-cost catalyst. But...

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