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- Title
Chemical Upcycling of PET Waste towards Terephthalate Redox Nanoparticles for Energy Storage.
- Authors
Goujon, Nicolas; Demarteau, Jérémy; de Pariza, Xabier Lopez; Casado, Nerea; Sardon, Haritz; Mecerreyes, David
- Abstract
Over 30 million ton of poly(ethylene terephthalate) (PET) is produced each year and no more than 60% of all PET bottles are reclaimed for recycling due to material property deteriorations during the mechanical recycling process. Herein, a sustainable approach is proposed to produce redox-active nanoparticles via the chemical upcycling of poly(ethylene terephthalate) (PET) waste for application in energy storage. Redox-active nanoparticles of sizes lower than 100 nm were prepared by emulsion polymerization of a methacrylic-terephthalate monomer obtained by a simple methacrylate functionalization of the depolymerization product of PET (i.e., bis-hydroxy(2-ethyl) terephthalate, BHET). The initial cyclic voltammetry results of the depolymerization product of PET used as a model compound show a reversible redox process, when using a 0.1Mtetrabutylammonium hexafluorophosphate/dimethyl sulfoxide electrolyte system, with a standard redox potential of -2.12 V vs. Fc/Fc+. Finally, the cycling performance of terephthalate nanoparticles was investigated using a 0.1 M TBAPF6 solution in acetonitrile as electrolyte in a three-electrode cell. The terephthalate anode electrode displays good cycling stability and performance at high C-rate (i.e., ≥5C), delivering a stable specific discharge capacity of 32.8 mAh.g-1 at a C-rate of 30 C, with a capacity retention of 94% after 100 cycles. However, a large hysteresis between the specific discharge and charge capacities and capacity fading are observed at lower C-rate (i.e., ≤2C), suggesting some irreversibility of redox reactions associated with the terephthalate moiety, in particular related to the oxidation process.
- Subjects
POLYETHYLENE terephthalate; WASTE recycling; NANOPARTICLES; ENERGY storage; OXIDATION-reduction reaction
- Publication
Sustainable Chemistry, 2021, Vol 2, Issue 4, p610
- ISSN
2673-4079
- Publication type
Article
- DOI
10.3390/suschem2040034