Modeling and experimental assessment of Nafion membrane properties used in SO2 depolarized water electrolysis for hydrogen production

Lokkiluoto, Anu; Gasik, Michael

doi:10.1016/j.ijhydene.2012.09.168

Cited by 12 publications

(5 citation statements)

References 35 publications

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“…32,[40][41][42][43] The process aims at decreasing the potentials required to achieve water reduction to hydrogen by replacing the conventional oxygen evolution reaction at the positive electrode with the less energetically demanding oxidation of SO 2 . As SO 2 oxidation occurs at much lower potentials than oxygen evolution, significantly lower cell voltages are required for hydrogen evolution.…”

Section: Discharge Of the Positive Electrolyte With A Sacrificial Elementioning

confidence: 99%

“…The electrochemical oxidation of aqueous sulfur dioxide to sulfuric acid has been a reaction of interest in recent years due to its relevance in the hybrid sulfur cycle for large-scale hydrogen production. 32,[40][41][42][43] The process aims at decreasing the potentials required to achieve water reduction to hydrogen by replacing the conventional oxygen evolution reaction at the positive electrode with the less energetically demanding oxidation of SO 2 . As SO 2 oxidation occurs at much lower potentials than oxygen evolution, significantly lower cell voltages are required for hydrogen evolution.…”

Section: Discharge Of the Positive Electrolyte With A Sacrificial Ele...mentioning

confidence: 99%

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All-vanadium dual circuit redox flow battery for renewable hydrogen generation and desulfurisation

et al. 2016

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Section: Discharge Of the Positive Electrolyte With A Sacrificial Elementioning

confidence: 99%

Section: Discharge Of the Positive Electrolyte With A Sacrificial Ele...mentioning

confidence: 99%

All-vanadium dual circuit redox flow battery for renewable hydrogen generation and desulfurisation

et al. 2016

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“…Nafion ® has been used as a separator in some fuel cells, but its cost is quite high [11]. For the practical application of an SPEM in direct methanol fuel cells, it is necessary to have low methanol permeability, high ionic conductivity, good mechanical strength, good thermal stability, and lower cost [12,13]. In the last decade, polyether ether ketone (PEEK) has exhibited great potential to be developed as an SPEM due to its balanced combination properties of good mechanical strength, high thermal stability, and superior chemical resistance.…”

Section: Introductionmentioning

confidence: 99%

Study of High Performance Sulfonated Polyether Ether Ketone Composite Electrolyte Membranes

Lin

Hsu

et al. 2019

Polymers

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In this study, high performance composite electrolyte membranes were prepared from polyether ether ketone polymeric material. An initial sulfonation reaction improved the membrane hydrophilicity and its water absorbability and thus enhanced the ionic conductivity in electrochemical cells. Protonic conductivity was improved from 10−4 to 10−2 S cm−1 with an increasing sulfonation time from 72 to 175 h. The effects of blending nano SiO2 into the composite membranes were devoted to improve thermal and mechanical properties, as well as methanol permeability. Methanol permeability was reduced to 3.1 × 10−7 cm2 s−1. Finally, a further improvement in ionic conductivity was carried out by a supercritical carbon dioxide treatment under 20 MPa at 40°C for 30 min with an optimum SiO2 blend ratio of 10 wt-%. The plasticizing effect by the Lewis acid-base interaction between CO2 and electron donor species on polymer chains decreased the glass transition and melting temperatures. The results show that sulfonated composite membranes blended with SiO2 and using a supercritical carbon dioxide treatment exhibit a lower glass transition temperature, higher ionic conductivity, lower methanol permeability, good thermal stability, and strong mechanical properties. Ionic conductivity was improved to 1.55 × 10−2 S cm−1. The ion exchange capacity and the degree of sulfonation were also investigated.

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“…2d). The correlation proposed by Lokkiluoto & Gasik [71], which globally predicts low diffusivity, also yields a low limiting current density. To maintain high performance at large currents, good water diffusivity under very dry conditions is crucial, similar to our conclusion for the ionic conductivity above.…”

Section: Water Diffusivity In the Ionomermentioning

confidence: 74%

“…4a). When the parameterizations of Fuller [67,83], Eikerling [27], Meier & Eigenberger [33] or Lokkiluoto & Gasik [71] are employed, the fuel cell model stalls at much lower current densities, because the anode dries out more. In summary, the electro-osmotic drag coefficient in Nafion is a model parameter with large uncertainty.…”

Section: Electro-osmosismentioning

confidence: 99%

Experimental parameter uncertainty in proton exchange membrane fuel cell modeling. Part I: Scatter in material parameterization

Vetter

Schumacher

2019

Journal of Power Sources

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Ever since modeling has become a mature part of proton exchange membrane fuel cell (PEMFC) research and development, it has been plagued by significant uncertainty lying in the detailed knowledge of material properties required. Experimental data published on several transport coefficients are scattered over orders of magnitude, even for the most extensively studied materials such as Nafion membranes, for instance. For PEMFC performance models to become predictive, high-quality input data is essential. In this bipartite paper series, we determine the most critical transport parameters for which accurate experimental characterization is required in order to enable performance prediction with sufficient confidence from small to large current densities. In the first part, a macro-homogeneous two-phase membrane-electrode assembly model is furnished with a comprehensive set of material parameterizations from the experimental and modeling literature. The computational model is applied to demonstrate the large spread in performance prediction resulting from experimentally measured or validated material parameterizations alone. The result of this is a ranking list of material properties, sorted by induced spread in the fuel cell performance curve. The three most influential parameters in this list stem from membrane properties: The Fickean diffusivity of dissolved water, the protonic conductivity and the electro-osmotic drag coefficient.

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Modeling and experimental assessment of Nafion membrane properties used in SO2 depolarized water electrolysis for hydrogen production

Cited by 12 publications

References 35 publications

All-vanadium dual circuit redox flow battery for renewable hydrogen generation and desulfurisation

All-vanadium dual circuit redox flow battery for renewable hydrogen generation and desulfurisation

Study of High Performance Sulfonated Polyether Ether Ketone Composite Electrolyte Membranes

Experimental parameter uncertainty in proton exchange membrane fuel cell modeling. Part I: Scatter in material parameterization

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