Local resolved investigation of hydrogen crossover in polymer electrolyte fuel cell

Jing, Shan; Gazdzicki, Pawel; Lin, Rui; Schulze, Mathias; Friedrich, K. Andreas

doi:10.1016/j.energy.2017.03.104

Cited by 27 publications

(8 citation statements)

References 42 publications

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“…Moreover, they confirmed that hydrogen cross‐infiltration mainly occurred at the inlet and the outlet was negligible. Similar research was considered by Shan et al with segmented cells, and the result showed that relative humidity had a more complicated relationship to hydrogen crossover compared with the linear effects of temperature and pressure on hydrogen crossover. Giner‐Sanz et al developed a model based on commercial membranes, which described the effects of anode and cathode pressure on internal short circuit and hydrogen crossover.…”

Section: Introductionsupporting

confidence: 84%

Research on two‐phase flow considering hydrogen crossover in the membrane for a polymer electrolyte membrane fuel cell

Ji¹,

Niu

Wang

et al. 2019

Int J Energy Res

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Summary Hydrogen crossover has an important effect on the performance and durability of the polymer electrolyte membrane fuel cell (PEMFC). Severe hydrogen crossover can accelerate the degradation of membrane and thus increase the possibility of explosion. In this study, a two‐phase, two‐dimensional, and multiphysics field coupling model considering hydrogen crossover in the membrane for PEMFC is developed. The model describes the distributions of reactant gases, current density, water content in membrane, and liquid water saturation in cathode electrodes of PEMFC with intrinsic hydrogen permeability, which is usually neglected in most PEMFC models. The conversion processes of water between gas phase, liquid phase, and dissolved water in PEMFC are simulated. The effects of changes in hydrogen permeability on PEMFC output performance and distributions of reactant gases and water saturation are analyzed. Results showed that hydrogen permeability has a marked effect on PEMFC operating under low current density conditions, especially on the open circuit voltage (OCV) with the increase of hydrogen permeability. On the contrary, the effect of hydrogen permeability on PEMFC at high current density is negligible within the variation range of hydrogen permeability in this study. The nonlinear relations of OCV with hydrogen diffusion rate are regressed.

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Section: Introductionsupporting

confidence: 84%

Research on two‐phase flow considering hydrogen crossover in the membrane for a polymer electrolyte membrane fuel cell

Ji¹,

Niu

Wang

et al. 2019

Int J Energy Res

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“…During fuel cell operation, only the same ions (protons or OH − -ions) are generated [ 52 , 53 , 54 ]. Nevertheless, even in this case, it is necessary to limit gas diffusion through the membrane as much as possible, which determines the so-called fuel crossover—the undesired passage of fuel, not accompanied by energy production [ 55 , 56 , 57 ]. The ratio of fluxes of desired and undesired components determines the value of selectivity, which is one of the most important membrane operating parameters [ 37 , 58 ].…”

Section: Introductionmentioning

confidence: 99%

Ionic Mobility in Ion-Exchange Membranes

Стенина

Yaroslavtsev

2021

Membranes

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Membrane technologies are widely demanded in a number of modern industries. Ion-exchange membranes are one of the most widespread and demanded types of membranes. Their main task is the selective transfer of certain ions and prevention of transfer of other ions or molecules, and the most important characteristics are ionic conductivity and selectivity of transfer processes. Both parameters are determined by ionic and molecular mobility in membranes. To study this mobility, the main techniques used are nuclear magnetic resonance and impedance spectroscopy. In this comprehensive review, mechanisms of transfer processes in various ion-exchange membranes, including homogeneous, heterogeneous, and hybrid ones, are discussed. Correlations of structures of ion-exchange membranes and their hydration with ion transport mechanisms are also reviewed. The features of proton transfer, which plays a decisive role in the membrane used in fuel cells and electrolyzers, are highlighted. These devices largely determine development of hydrogen energy in the modern world. The features of ion transfer in heterogeneous and hybrid membranes with inorganic nanoparticles are also discussed.

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“…In the absence of oxygen, the currents are negative over the entire active area (Figure 5B). The average current density is −3.6 mA cm −2 , which is a typical value for hydrogen crossover at this membrane thickness [36] . Since no oxygen is present, no ORR takes place and therefore no positive currents were measured in Figure 5B.…”

Section: Resultsmentioning

confidence: 86%

“…The average current density is À 3.6 mA cm À 2 , which is a typical value for hydrogen crossover at this membrane thickness. [36] Since no oxygen is present, no ORR takes place and therefore no positive currents were measured in Figure 5B. In contrast, at an oxygen content of 6.9 vol.…”

Section: Capacitance In the Presence Of Oxygenmentioning

confidence: 92%

Analysis of the Capacitive Behavior of Polymer Electrolyte Membrane Fuel Cells during Operation

et al. 2020

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The interest in polymer electrolyte membrane fuel cells for automotive applications is nowadays increasing. To run such systems efficiently, the operating strategy relies on information about the stacks operational conditions. The cell capacitance, in most cases, contains such information and it can be measured in real‐time using electrochemical impedance spectroscopy. However, the influence of the operating conditions on the cell capacitance is poorly understood so far. Therefore, this work analyses the influence of the oxygen content and cell voltage. Cyclic voltammetry and impedance spectroscopy data show equal hydrogen adsorption charges in oxygen‐free operation. In oxygen‐saturated atmosphere, the adsorption capacitance below 0.40 V is suppressed, probably owing to the fast adsorption of OH*. However, this allows distinction between the oxygen‐free and oxygen‐saturated conditions, as in the first case the total capacitance is significantly larger. Thus, an impedance‐based operation strategy could detect oxygen undersupply in the fuel cells in real‐time.

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Local resolved investigation of hydrogen crossover in polymer electrolyte fuel cell

Cited by 27 publications

References 42 publications

Research on two‐phase flow considering hydrogen crossover in the membrane for a polymer electrolyte membrane fuel cell

Research on two‐phase flow considering hydrogen crossover in the membrane for a polymer electrolyte membrane fuel cell

Ionic Mobility in Ion-Exchange Membranes

Analysis of the Capacitive Behavior of Polymer Electrolyte Membrane Fuel Cells during Operation

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