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Sulfonic Acid Functionalized Chitosan as a Sustainable Component for Proton Conductivity Management in PEMs

Abstract : One of the most fundamental assets of natural polysaccharides is their water storage capacity. Analogically, materials able to regulate water hydration in energetic systems (e.x.: fuel-cells) are of paramount interest. In light of this key characteristic, chitosan, an aminocarbohydrate derived from shellfish waste, was structurally conjugated using sulfosuccinic acid to afford CS-SO3H. The resulting polymeric material appears well suitable for enhancing proton conduction and tuning the hydrophilic-hydrophobic balance of the proton exchange membranes (PEM). Consequently, Nafion membrane modified with CS-SO3H presented σH+ values almost 2 times higher than that of pristine Nafion at every % RH level exposed (30 °C - 80 °C and 30% - 90%). The σH+ enhancement is in agreement with the lower activation energy indicating that the proton transport is facilitated in the presence of -SO3H modified chitosan. We have found indications that –SO3H modified chitosan polymer, as a sustainable additive to Nafion is able to control the proton conduction mechanism and keep the activation energy for proton conduction at lower values as compared to pristine Nafion.
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https://hal.sorbonne-universite.fr/hal-01522424
Contributor : Gestionnaire Hal-Upmc <>
Submitted on : Monday, May 15, 2017 - 9:41:51 AM
Last modification on : Wednesday, September 23, 2020 - 4:33:02 AM

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Ibtissam Ressam, Natacha Krins, Christel Laberty-Robert, Mohamed Selmane, Mohammed Lahcini, et al.. Sulfonic Acid Functionalized Chitosan as a Sustainable Component for Proton Conductivity Management in PEMs. ChemistrySelect, Wiley, 2017, 2 (8), pp.2503 - 2511. ⟨10.1002/slct.201601904⟩. ⟨hal-01522424⟩

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