Determination of the optimal operating temperature range for high temperature PEM fuel cell considering its performance, CO tolerance and degradation

2015 ◽  
Vol 105 ◽  
pp. 433-441 ◽  
Author(s):  
Caizhi Zhang ◽  
Weijiang Zhou ◽  
Mohsen Mousavi Ehteshami ◽  
Youyi Wang ◽  
Siew Hwa Chan
Keyword(s):  
High Temperature ◽  
Fuel Cell ◽  
Operating Temperature ◽  
Pem Fuel Cell ◽  
Optimal Operating ◽  
Optimal Operating Temperature ◽  
Temperature Range ◽  
Co Tolerance ◽  
Operating Temperature Range

A Robust SOI Gain-Boosted Operational Amplifier Targeting High Temperature Precision Applications up to 300°C

2011 ◽  
Vol 2011 (HITEN) ◽  
pp. 000238-000242
Author(s):  
Alexander Schmidt ◽  
Abdel Moneim Marzouk ◽  
Holger Kappert ◽  
Rainer Kokozinski
Keyword(s):  
High Temperature ◽  
Circuit Design ◽  
Robust Design ◽  
Wide Temperature Range ◽  
Operational Amplifier ◽  
Operating Temperature ◽  
High Gain ◽  
Temperature Range ◽  
Op Amp ◽  
Operating Temperature Range

Data acquisition and signal processing at elevated temperatures are facing various problems due to a wide temperature range operation, affecting the accuracy of the circuits' references and elementary building blocks. As the most commonly used analog building block, the operational amplifier (op-amp) with its various limitations has to be enhanced for wide temperature range operation. Thereby major effort is put into maximizing signal gain and simultaneously reaching high gain-bandwidth also for high temperatures. Future robust design approaches have to consider a growing operating temperature range and increasing device parameter mismatch due to the downsizing of integrated circuits. Addressing one of the major problems in circuit design for the next decades, compensating these effects through new design approaches will have a lasting impact on circuit design. In this paper we present a high gain operational amplifier with a folded-cascode and gain-boosted input stage, fabricated in a 1.0 μm SOI CMOS process. The operational amplifier was designed for an operating temperature range of −40…300°C. Major effort was put into a robust design approach with reduced sensitivity to temperature variations, targeting high precision applications in a high temperature environment. With a supply voltage of 5 V, the maximum simulated current consumption of the op-amp is 210 μA which leads to overall maximum power consumption of 1.05 mW. The open loop DC gain of the amplifier is expected to reach a minimum of 108 dB and a unity-gain-frequency of 1.02 MHz at a temperature of 300°C. For all temperatures the phase margin varies from 55…70 degrees for a 3 pF load.

Experimental Performance Evaluation of a High Temperature PEM Fuel Cell Prototype Under Various Operating Conditions

2011 ◽  
Author(s):  
Susanta K. Das
Keyword(s):  
High Temperature ◽  
Fuel Cell ◽  
Operating Temperature ◽  
Pem Fuel Cell ◽  
Operating Conditions ◽  
Co Poisoning ◽  
Current Voltage ◽  
Current Voltage Characteristics ◽  
Fuel Stream ◽  
High Temperature Pem

In this study, we experimentally evaluated our newly designed high temperature PEM fuel cell (HTPEMFC) prototype performance at different operating conditions. In particular, we investigated the effects of operating temperature, pressure, air stoichiometry and CO poisoning in the anode fuel stream on the current-voltage characteristics of the HTPEMFC prototype. Experimental results obtained from the single HTPEM fuel cell show that the performance is quite steady with high CO-level reformate at high operating temperature which makes it possible to feed the reformate gas directly from the reformer to the stack without further CO removal. In order to develop design parameters for fuel reformer, experimental data of this type would be very useful. The results obtained from this study showed significant variations in current-voltage characteristics of HTPEMFC at different temperatures with different CO poisoning rates. The results are promising to understand the overall system performance development strategy of HTPEMFC in terms of current-voltage characteristics while fed with reformate with different CO ratios in the anode fuel stream.

Three Dimensional Non-Isothermal Model of a High Temperature PEM Fuel Cell

2009 ◽  
Author(s):  
Zhongying Shi ◽  
Xia Wang
Keyword(s):  
High Temperature ◽  
Fuel Cell ◽  
Relative Humidity ◽  
Phosphoric Acid ◽  
Doping Level ◽  
Operating Temperature ◽  
Three Dimensional ◽  
Pem Fuel Cell ◽  
Isothermal Model ◽  
Fuel Cell Performance

The proton exchange membrane (PEM) fuel cell using a polybenzimidazole (PBI) membrane operates between 120 °C and 180 °C, higher than the PEM fuel cell with a Nafion based membrane (lower than 80°C). Few studies have been conducted in the theoretical modeling of the PEM fuel cell with a PBI membrane. Experimental results have shown that the conductivity of a PBI membrane is affected by the phosphoric acid doping level, the cell operating temperature and the relative humidity. The fuel cell performance is thus affected by these parameters as well. The objective of this paper is to develop a three dimensional non-isothermal model to investigate the performance of the fuel cell with a PBI membrane. This new model considers influences of the relative humidity of the inlet air, the phosphoric acid doping level, and the operating temperature on the performance of fuel cells. The model is validated using the experimental data. A high oxygen concentration is found under the flow channel, as well as a high temperature region. The performance of fuel cells increases with the increase of the phosphoric doping level, temperature or relative humidity. The fuel cell performance is found to be more sensitive to the doping level and temperature changes, and less sensitive to the change of relative humidity.

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