Simultaneous measurement of the effective ionic conductivity and effective electronic conductivity in a porous electrode film impregnated with electrolyte

Siroma, Zyun; Hagiwara, Jumpei; Yasuda, Kazuaki; Inaba, Masaaki; Tasaka, Akimasa

doi:10.1016/j.jelechem.2010.08.010

Cited by 27 publications

(24 citation statements)

References 19 publications

(22 reference statements)

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“…Such linearity suggests an increase in the resistance of the system (R tot ), the latter corresponding to the sum of (i) the resistance of the electrolyte (R el ), of (ii) the glassy carbon (R GC ) and of (iii) the catalytic layer (R k -see Figure 7D). [106][107][108][109][110] R el of ca. 20 were determined by electrochemical impedance spectroscopy (EIS) before and after the start-stop ageing and R GC was assumed to be negligible, owing to the high electronic conductivity of the glassy carbon.…”

Section: Durability and Electrochemical Activity In Base-load Cyclesmentioning

confidence: 99%

Activity and Durability of Platinum-Based Electrocatalysts Supported on Bare or Fluorinated Nanostructured Carbon Substrates

Asset

Chattot

Maillard

et al. 2018

J. Electrochem. Soc.

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Nanostructured carbons were fluorinated and used as supports for Pt nanoparticles deposition using a modified polyol route. The resulting materials exhibited similar Pt nanoparticles sizes, but different agglomeration rates. The electrocatalysts were tested toward the oxygen reduction reaction, and their stability was investigated in simulated load cycling (0.6 < E < 1.0 V vs. RHE) or start-up/shutdown (1.0 < E < 1.5 V vs. RHE) protocols. Irrespective the support material, the former protocol caused Pt nanocrystallites dissolution/redeposition via Ostwald ripening, mildly decreasing the electrochemically-active surface area and ORR activity. In contrast, the carbon supports were strongly corroded after the start-up/shutdown protocol, resulting in pronounced detachment/agglomeration of Pt nanocrystallites, albeit in absence of significant particle-size growth. Fluorination had different effects on the stability of structurally-ordered and structurally-disordered carbons: beneficial effects were observed for the latter whereas the former was affected negatively. "Free" dangling groups present in structurally-disordered carbon, known to be prone to preferential oxidation in PEMFC environment, combine with the fluorine precursors upon fluorination, leading to formation of more robust C-F bonds versus oxidation than original CO bonds. In contrast, fluorination of structurally-ordered carbon creates structural disorder (C-C bonds are broken), leading to promotion of electrochemical corrosion.

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Section: Durability and Electrochemical Activity In Base-load Cyclesmentioning

confidence: 99%

Activity and Durability of Platinum-Based Electrocatalysts Supported on Bare or Fluorinated Nanostructured Carbon Substrates

Asset

Chattot

Maillard

et al. 2018

J. Electrochem. Soc.

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“…σ is determined as 2 S/cm, which is an experimentally determined value (Siroma et al, 2010). This estimation implies that all cathode reactions occur at the centerline of the channel, although there is reaction distribution in the electrodes of real cells.…”

Section: Performance Evaluationmentioning

confidence: 99%

Composition and evaluation of single-layer electrode proton exchange membrane fuel cells for mass transfer analysis

Suzuki

Miyauchi

Hayase

et al. 2016

JTST

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“…In this model, the carbon phase was considered equipotential because of the 100 to 1000 times higher conductivity of carbon than the ionic phase [5]. All faradaic reactions were neglected, including carbon oxidation and hydrogen crossover.…”

Section: D Homogeneous Modelmentioning

confidence: 99%

“…In [3], [4] the authors used a H 2 pump technique to measure the resistance of their samples, consisting of a pseudo catalyst layer sandwiched between two membranes. Siroma and co-workers [5] used a specific setup to measure the in-plane DC ionic resistance of a catalyst layer (CL). Their method ensured that no faradaic current was transferred from one phase to the other.…”

Section: Introductionmentioning

confidence: 99%

Measurement of protonic resistance of catalyst layers as a tool for degradation monitoring

Gaumont

Maranzana

Lottin

et al. 2017

International Journal of Hydrogen Energy

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International audienceThe ionic resistance of a PEM fuel cell catalyst layer, as well as the double layer capacity and the high frequency resistance are estimated from the impedance spectra of H2/N2 operated cell, thanks to a volumetric electrode model. The impedance spectra are calculated in the case of a homogeneous distribution of resistivity and capacity, and considering both through plane and in plane heterogeneities.Then, results of the degradation of a MEA subjected to four different accelerated stress tests are presented. They consist of (i) a constant current operation, (ii) 1.2 V potential hold with nitrogen and hydrogen (iii) open circuit voltage (OCV) hold with air and hydrogen, and (iv) a start-up protocol where heterogeneous degradations are observed using a linear segmented fuel cell. This technique can provide useful information about the evolution of catalyst layer microstructure during AST

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Simultaneous measurement of the effective ionic conductivity and effective electronic conductivity in a porous electrode film impregnated with electrolyte

Cited by 27 publications

References 19 publications

Activity and Durability of Platinum-Based Electrocatalysts Supported on Bare or Fluorinated Nanostructured Carbon Substrates

Activity and Durability of Platinum-Based Electrocatalysts Supported on Bare or Fluorinated Nanostructured Carbon Substrates

Composition and evaluation of single-layer electrode proton exchange membrane fuel cells for mass transfer analysis

Measurement of protonic resistance of catalyst layers as a tool for degradation monitoring

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