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<p>The growing global emphasis on sustainable energy solutions has intensified the search for high-performance, environmentally benign electrode materials that can meet the dual demands of energy storage and waste minimization. Among the emerging strategies, the valorization of plastic waste into functional materials for supercapacitor applications presents a compelling circular economic approach. In this work, we report the solvothermal synthesis of lanthanum-based metal–organic frameworks (La-MOFs) utilizing three distinct types of post-consumer plastic wastes polyethylene terephthalate (PET) bottles, low-density polyethylene (LDPE) plastic bags, and polystyrene (PS) petri dishes as unconventional organic linker sources. Without the need for purified chemicals or complex pre-treatment, the plastics were directly converted in situ under solvothermal conditions (180&#xa0;°C for 24&#xa0;h in a DMF/H<sub>2</sub>O medium) into coordination-capable moieties, leading to the successful formation of La-MOF nanostructures labeled as La-PET, La-LDPE, and La-PS. Comprehensive structural and electrochemical characterizations revealed significant differences in morphology, crystallinity, and capacitive behavior across the samples, dictated by the chemical nature of the original plastic waste. Notably, the La-PS material derived from polystyrene petri dishes exhibited the highest specific capacitance of 583.91&#xa0;F/g at 1&#xa0;A/g, attributed to its high surface area and possibly enhanced electronic interactions. Meanwhile, La-LDPE, synthesized from plastic bags, demonstrated exceptional rate capability at 20&#xa0;A/g, suggesting favorable ion transport dynamics and structural stability under high current densities.</p>

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Recycling waste plastics into La-MOFs for supercapacitor applications: morphology-controlled synthesis and electrochemical performance

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • Zeynep Pekdemir,
  • Fatma Kılıç Dokan,
  • M. Serdar Onses,
  • Ertugrul Sahmetlioglu

摘要

The growing global emphasis on sustainable energy solutions has intensified the search for high-performance, environmentally benign electrode materials that can meet the dual demands of energy storage and waste minimization. Among the emerging strategies, the valorization of plastic waste into functional materials for supercapacitor applications presents a compelling circular economic approach. In this work, we report the solvothermal synthesis of lanthanum-based metal–organic frameworks (La-MOFs) utilizing three distinct types of post-consumer plastic wastes polyethylene terephthalate (PET) bottles, low-density polyethylene (LDPE) plastic bags, and polystyrene (PS) petri dishes as unconventional organic linker sources. Without the need for purified chemicals or complex pre-treatment, the plastics were directly converted in situ under solvothermal conditions (180 °C for 24 h in a DMF/H2O medium) into coordination-capable moieties, leading to the successful formation of La-MOF nanostructures labeled as La-PET, La-LDPE, and La-PS. Comprehensive structural and electrochemical characterizations revealed significant differences in morphology, crystallinity, and capacitive behavior across the samples, dictated by the chemical nature of the original plastic waste. Notably, the La-PS material derived from polystyrene petri dishes exhibited the highest specific capacitance of 583.91 F/g at 1 A/g, attributed to its high surface area and possibly enhanced electronic interactions. Meanwhile, La-LDPE, synthesized from plastic bags, demonstrated exceptional rate capability at 20 A/g, suggesting favorable ion transport dynamics and structural stability under high current densities.