scholarly journals Fault Characterization of a Proton Exchange Membrane Fuel Cell Stack

Energies ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 152 ◽  
Author(s):  
Samuel Simon Araya ◽  
Fan Zhou ◽  
Simon Lennart Sahlin ◽  
Sobi Thomas ◽  
Christian Jeppesen ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Proton Exchange Membrane ◽  
Electrochemical Impedance ◽  
Proton Exchange ◽  
Co Poisoning ◽  
Membrane Conductivity ◽  
Eis Measurements ◽  
Fault Characterization ◽  
Exchange Membrane ◽  
H2s Poisoning

In this paper, the main faults in a commercial proton exchange membrane fuel cell (PEMFC) stack for micro-combined heat and power ( μ -CHP) application are investigated, with the scope of experimentally identifying fault indicators for diagnosis purposes. The tested faults were reactant starvation (both fuel and oxidant), flooding, drying, CO poisoning, and H2S poisoning. Galvanostatic electrochemical impedance spectroscopy (EIS) measurements were recorded between 2 kHz and 0.1 Hz on a commercial stack of 46 cells of a 100- cm 2 active area each. The results, obtained through distribution of relaxation time (DRT) analysis of the EIS data, show that characteristic peaks of the DRT and their changes with the different fault intensity levels can be used to extract the features of the tested faults. It was shown that flooding and drying present features on the opposite ends of the frequency spectrum due the effect of drying on the membrane conductivity and the blocking effect of flooding that constricts the reactants’ flow. Moreover, it was seen that while the effect of CO poisoning is limited to high frequency processes, above 100 Hz, the effects of H2S extend to below 10 Hz. Finally, the performance degradation due to all the tested faults, including H2S poisoning, is recoverable to a great extent, implying that condition correction after fault detection can contribute to prolonged lifetime of the fuel cell.

Evaluation of the corrosion behavior of a TiN-coated 316L SS bipolar plate using dynamic electrochemical impedance spectroscopy

2018 ◽  
Vol 42 (17) ◽  
pp. 14394-14409 ◽  
Author(s):  
S. Pugal Mani ◽  
Bhavana Rikhari ◽  
Perumal Agilan ◽  
N. Rajendran
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Fuel Cell ◽  
Impedance Spectroscopy ◽  
Corrosion Behavior ◽  
Proton Exchange Membrane ◽  
Electrochemical Impedance ◽  
Bipolar Plate ◽  
Proton Exchange ◽  
Exchange Membrane ◽  
Dynamic Electrochemical Impedance Spectroscopy

In the present investigation, the corrosion behavior of TiN-coated 316L SS was evaluated for use in a proton-exchange membrane fuel cell using dynamic electrochemical impedance spectroscopy (DEIS).

Improvement of CO Tolerance of Proton Exchange Membrane Fuel Cell (PEMFC) by an Air-Bleeding Technique

2005 ◽  
Author(s):  
Chen-Chung Chung ◽  
Chiun-Hsun Chen ◽  
Hsiang-Hui Lin ◽  
Yi-Yie Yan
Keyword(s):  
Carbon Monoxide ◽  
Fuel Cell ◽  
Proton Exchange Membrane ◽  
Cell Voltage ◽  
Significant Loss ◽  
Proton Exchange ◽  
Co Poisoning ◽  
Fuel Gas ◽  
Co Tolerance ◽  
Exchange Membrane

The investigation studies improving PEMFC carbon monoxide by a periodic air dosing. The carbon monoxide in the fuel gas leads to a significant loss in power density due to CO poisoning in the anode. The method involves bleeding air into the anode fuel stream (H2-CO), which contains CO in various concentrations (20, 52.7, 100 ppm). In the transient CO poisoning test, air-bleeding is performed for four different periodic air dosing and cell voltage is fixed at 0.6 V. The result of a dosing of air during 10 sec in intervals of 10 sec is similar to that of continuous air-bleeding except 100 ppm CO. The CO tolerance of the fuel cell and cell performance recovery from poisoning can be improved by air-bleeding.

Study on the degradation mechanism of the proton exchange membrane fuel cell based on constant voltage cold start mode

2021 ◽  
pp. 1-23
Author(s):  
Yanbo Yang ◽  
Tiancai Ma ◽  
Fenglai Pei ◽  
Weikang Lin ◽  
Kai Wang ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Proton Exchange Membrane ◽  
Electrochemical Impedance ◽  
Degradation Mechanism ◽  
Cold Start ◽  
Proton Exchange ◽  
Constant Voltage ◽  
Fuel Cell Performance ◽  
Start Up ◽  
Exchange Membrane

Abstract The constant voltage cold start of the proton exchange membrane fuel cell (PEMFC) is usually operated at a low start voltage in order to ensure high heat generation, which can shorten the process of the PEMFC cold start. However, the effect of constant voltage cold start on the durability of PEMFC is still unclear. Thus, in this work, the PEMFC is tested repeatedly at a low start-voltage to simulate its actual operating state in the vehicle. Then the effect of the PEMFC durability under constant voltage cold start is investigated by polarization curve, cyclic voltammetry, electrochemical impedance spectroscopy, transmission electron microscope and ion chromatography. After the repeatedly cold start, the output performance of the PEMFC decreases significantly. According to the characterization results, the degradation mechanism of the PEMFC at the constant voltage cold start is demonstrated to be that the PEMFC start-up repeatedly at low start-voltage leads to the decomposition of membrane polymer structure and promotes the crossover of H2. Meanwhile, the PEMFC start-up repeatedly at low start-voltage also leads to the agglomeration of catalysts, which reduces the active area of catalysts and ultimately results in the degradation of fuel cell performance. Above all, this study proves that the durability of PEMFC can be shortened by the constant voltage cold start at 0.1 V, which provides a reference for the development of the PEMFC cold start control strategy.

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