Pressure–voltage oscillations as a diagnostic tool for PEFC cathodes

Niroumand, Amir M.; Mérida, Walter; Eikerling, Michael; Saif, Mehrdad

doi:10.1016/j.elecom.2009.11.003

Cited by 45 publications

(24 citation statements)

References 10 publications

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“…As an output, the most suitable electric output variable (current or potential), depending on the condition under which the experiment is performed, has been considered. Somewhat similar idea has been proposed by Niroumand et al [32].…”

Section: Introductionsupporting

confidence: 63%

Concentration-alternating frequency response: A new method for studying polymer electrolyte membrane fuel cell dynamics

Sorrentino

Vidaković‐Koch

Hanke‐Rauschenbach

et al. 2017

Electrochimica Acta

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In this work, the concentration-alternating frequency response analysis (cFRA) is proposed as a new method to study the dynamics of open electrochemical systems. The cFRA implies the perturbation of the electrochemical system through a feed characterized by a periodic concentration of a certain reactant. The most suitable detectable electrical output variable (potantial or current density) depends on the operating condition under which the experiment is performed. As illustrative example, a transient model accounting for the essential dynamic processes occurring in polymer electrolyte membrane fuel cells (PEMFC) is derived, and used to investigate the valuable insights obtainable from the cFRA spectra. Additionally, a sensitivity analysis is accomplished by use of sensitivity coefficients in order to estimate which model parameters can be better identified from EIS or from cFRA. It is shown that cFRA displayes a significantly Electrochimica Acta April 27, 2017 higher sensitivity than EIS for kinetic parameters. Moreover, a detailed analysis of the feasibility of the new technique is performed to identify appropriate operating conditions. In conclusion, cFRA can be regarded as an innovative and valuable tool for PEMFC identification.

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Section: Introductionsupporting

confidence: 63%

Concentration-alternating frequency response: A new method for studying polymer electrolyte membrane fuel cell dynamics

Sorrentino

Vidaković‐Koch

Hanke‐Rauschenbach

et al. 2017

Electrochimica Acta

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“…Analysis of the results presented in the works reveals a lot of factors affecting on FC electrical fluctuation parameters: generated current [10,12,13,15e17], current distribution over membrane surface [15], membrane-electrode assembly (MEA) water balance [10,12,14,15], gas flow rate [12,16], stoichiometry [14,15] and pressure [10,19]. Moreover, fluctuations in electrochemical systems introduced by turbulent fluctuations of electrolyte (turbulent noise) have been studied intensively from the theoretical and the experimental points of view in Refs.…”

Section: Introductionmentioning

confidence: 99%

New approach for PEMFC diagnostics based on quantitative description of quasi-periodic oscillations

Nigmatullin

Martemianov

Evdokimov

et al. 2016

International Journal of Hydrogen Energy

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“…During the last years, several groups have proposed FRA experimental techniques based on nonelectrical inputs and/or outputs to study the dynamics of electrochemical systems [3][4][5][6]. Recently, the use of the backpressure as input variable was suggested for studying the transport phenomena in the PEMFC [7,8]. Most notably, Engebretsen et al have proposed a transfer function involving the cathode backpressure perturbations as input and the cell potential as output [8].…”

Section: Introductionmentioning

confidence: 99%

Studying mass transport dynamics in polymer electrolyte membrane fuel cells using concentration-alternating frequency response analysis

Sorrentino

Vidaković‐Koch

Sundmacher

2019

Journal of Power Sources

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In the present contribution an experimental validation and a measurement routine of a new electrochemical method to study dynamics of electrochemical processes, the so-called concentration alternating frequency response analysis (cFRA) is presented. In cFRA the electrical response of the cell (current or potential) to periodic perturbation of specific reactant feeds is studied by means of linear system analysis. For the example of a polymer electrolyte fuel cell (PEMFC) we show that cFRA, in contrast to classical electrochemical impedance spectroscopy (EIS), detects selectively the effect of the dynamics of mass transport of reactants and products inside the different layers of the PEMFC. Moreover, cFRA can be used to diagnose the humidification state of the fuel cell cathode. Finally, procedures to improve the diagnostic skills of the proposed cFRA technique are discussed and directions of future work are recommended.

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Pressure–voltage oscillations as a diagnostic tool for PEFC cathodes

Cited by 45 publications

References 10 publications

Concentration-alternating frequency response: A new method for studying polymer electrolyte membrane fuel cell dynamics

Concentration-alternating frequency response: A new method for studying polymer electrolyte membrane fuel cell dynamics

New approach for PEMFC diagnostics based on quantitative description of quasi-periodic oscillations

Studying mass transport dynamics in polymer electrolyte membrane fuel cells using concentration-alternating frequency response analysis

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