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The lack of green and highly selective upcycling methods has led to severe environmental concerns and resource waste. Photoelectrocatalysis utilizes high\u2010energy photogenerated charge carriers to directionally upgrade plastic\u2010derived small molecules into value\u2010added chemicals. However, current photoelectrocatalytic technologies still face challenges in processing structurally inert bulk polymer plastics. In this study, we report a hydrothermal\u2010photoelectrocatalytic tandem strategy to realize the upcycling of PE and other polyolefin plastics. The acetic acid product obtained from hydrothermal treatment are further converted into ethanol over an Au nanoparticle\u2011decorated GaN\/Si (Au\/GaN\/Si) photocathode, achieving an optimal performance of a Faradaic efficiency of 57.6%. This tandem strategy also demonstrates excellent generality in the conversion of polypropylene (PP) and polyvinyl chloride (PVC), providing a green route for the upcycling of polyolefin plastics.<\/jats:p>","DOI":"10.1002\/cctc.71036","type":"journal-article","created":{"date-parts":[[2026,8,22]],"date-time":"2026-08-22T12:09:33Z","timestamp":1787400573000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Upgrading Polyolefin Plastics Into Ethanol Using an Integrated Hydrothermal\u2010Photoelectrocatalytic Strategy"],"prefix":"10.1002","volume":"18","author":[{"given":"Xiang","family":"Gao","sequence":"first","affiliation":[{"name":"Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and Environment Southeast University  Nanjing 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