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Article Dans Une Revue Journal of Power Sources Année : 2020

From plastic-waste to H2: Electrolysis of a Poly(methyl methacrylate) model molecule on polymer electrolyte membrane reactors

Résumé

Hydrogen production by the electrolysis of plastic-waste was recently suggested as an alternative approach to water electrolysis, owing to its favoured thermodynamics. However, the fundamental aspects of such electro-catalytic process were not studied in detail. Here we propose a new approach to understand the electrolysis of polymers, by the use of model molecules. Our target is to develop a technology for the electrolysis of poly(methyl methacrylate), PMMA, plastic waste. We used methyl pivalate (MP) as a model molecule, since it contains similar functional groups than PMMA. We performed electrolysis experiments in a Polymer Electrolyte Membrane reactor with Nafion® protonic membranes and Pt/C electrodes at low temperatures (<90 • C). The results obtained demonstrated that the electro-oxidation of MP allows to produce H 2 in a range of electrical potentials where water electrolysis is not thermodynamically possible (<1.2 V). The kinetics of this process were studied and a preliminary global mechanism was proposed to explain the electro-oxidative cleavage of this model molecule. We have clearly demonstrated that the electrolysis of a plastic-like model monomer leads to the production of hydrogen. These results could be further extrapolated in view of the practical implementation of this technology for the valorisation of PMMA waste.
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Dates et versions

hal-03007649 , version 1 (09-11-2021)

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N Grimaldos-Osorio, F Sordello, M Passananti, P. Vernoux, A Caravaca. From plastic-waste to H2: Electrolysis of a Poly(methyl methacrylate) model molecule on polymer electrolyte membrane reactors. Journal of Power Sources, 2020, 480, pp.228800. ⟨10.1016/j.jpowsour.2020.228800⟩. ⟨hal-03007649⟩
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