Integrating recyclable polymers into thermoelectric devices for green electronics

Electronic waste (e-waste) recycling is one of the central frameworks of the circular economy. However, most e-wastes consist of both organic and inorganic components, which significantly limits their clean separation and recycling for repurposing. Herein, we demonstrate the use of a recyclable polymer (vitrimer) as the encapsulation matrix to construct a recyclable thermoelectric device. An epoxy vitrimer containing dynamic silyl ether linkage was employed as the device encapsulation to provide mechanical support, conformability to surfaces, and more importantly, reprocessability. Benefiting from these features, the resultant vitrimer encapsulated thermoelectric device not only showed an enhanced power generation ability relative to the parent device, but also exhibited new alluring characteristics, such as strong mechanical properties, operability under deformed conditions, clean separation capability, and recyclability. Remarkably, the refabricated device retains its power generation performance, demonstrating the reliability of this method. The strategy reported here can be generally applied to other electronic devices, therefore contributing towards sustainable and circular utilization of resources.