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    Simulation of Mode-Switching Methods’ Effect on Mass Transfer in a Unitized Regenerative Fuel Cell

    Source: Journal of Energy Engineering:;2019:;Volume ( 145 ):;issue: 001
    Author:
    Hang Guo; Lu Lu Wang; Xu Ling Yi; Fang Ye; Chong Fang Ma
    DOI: 10.1061/(ASCE)EY.1943-7897.0000589
    Publisher: American Society of Civil Engineers
    Abstract: Unitized regenerative fuel cells are unique devices that combine the functions of fuel cells and water electrolysis in one system. The internal mass-transport mechanisms present in a unitized regenerative fuel cell are closely related to the mode-switching method of the cell. A two-dimensional, single-phase, isothermal, multicomponent, and transient model was developed to investigate the characteristics of mass transfer coupled with electrochemical reaction in a unitized regenerative fuel cell under interval and continuous mode-switching methods. Results indicate that the average gas mass fractions in the gas-flow channel, gas diffusion layer, and catalyst layer are the same under the two different mode-switching methods. Gas mass fractions in different layers exhibit the same variation trend and gradient during the first and second cycles of interval and continuous switching. Under the two different mode-switching methods, the gradient of the gas mass fraction in fuel cell mode is larger than that in water electrolysis mode. The transient response of these layers under two different mode-switching methods is delayed by approximately 0.2 s compared with that of the operating voltage.
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      Simulation of Mode-Switching Methods’ Effect on Mass Transfer in a Unitized Regenerative Fuel Cell

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4254886
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    contributor authorHang Guo; Lu Lu Wang; Xu Ling Yi; Fang Ye; Chong Fang Ma
    date accessioned2019-03-10T12:06:23Z
    date available2019-03-10T12:06:23Z
    date issued2019
    identifier other%28ASCE%29EY.1943-7897.0000589.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4254886
    description abstractUnitized regenerative fuel cells are unique devices that combine the functions of fuel cells and water electrolysis in one system. The internal mass-transport mechanisms present in a unitized regenerative fuel cell are closely related to the mode-switching method of the cell. A two-dimensional, single-phase, isothermal, multicomponent, and transient model was developed to investigate the characteristics of mass transfer coupled with electrochemical reaction in a unitized regenerative fuel cell under interval and continuous mode-switching methods. Results indicate that the average gas mass fractions in the gas-flow channel, gas diffusion layer, and catalyst layer are the same under the two different mode-switching methods. Gas mass fractions in different layers exhibit the same variation trend and gradient during the first and second cycles of interval and continuous switching. Under the two different mode-switching methods, the gradient of the gas mass fraction in fuel cell mode is larger than that in water electrolysis mode. The transient response of these layers under two different mode-switching methods is delayed by approximately 0.2 s compared with that of the operating voltage.
    publisherAmerican Society of Civil Engineers
    titleSimulation of Mode-Switching Methods’ Effect on Mass Transfer in a Unitized Regenerative Fuel Cell
    typeJournal Paper
    journal volume145
    journal issue1
    journal titleJournal of Energy Engineering
    identifier doi10.1061/(ASCE)EY.1943-7897.0000589
    page04018071
    treeJournal of Energy Engineering:;2019:;Volume ( 145 ):;issue: 001
    contenttypeFulltext
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