{"corpus_id":236010697,"paper_sha":"26c75089ad107e65291e7616ba7a0ed862c36e5b","doi":"10.1039/D1GC00354B","arxiv_id":null,"pmid":null,"pmcid":null,"mag_id":3160445069,"dblp_id":null,"acl_id":null,"title":"Dual functionality of mixed Cu-based two-dimensional (2D) heterostructures derived from electronic waste","year":2021,"publication_date":"2021-05-14","venue":"","journal":{"name":"Green Chemistry","pages":null,"volume":""},"journal_issn":null,"journal_title":null,"publication_types":[],"pubmed_pub_types":null,"s2_fields_of_study":["Materials Science","Engineering","Environmental Science"],"reference_count":48,"citation_count":7,"influential_citation_count":0,"is_open_access":false,"arxiv_categories":null,"arxiv_license":null,"arxiv_journal_ref":null,"mesh_headings":null,"chemicals":null,"comments_corrections":null,"source_flags":1,"s2_open_access_pdf_url":null,"s2_open_access_landing_url":null,"s2_open_access_license":null,"s2_open_access_status":null,"pmc_open_access_pdf_url":null,"pmc_open_access_landing_url":null,"pmc_open_access_license":null,"pmc_open_access_status":null,"unpaywall_open_access_pdf_url":null,"unpaywall_open_access_landing_url":null,"unpaywall_open_access_license":null,"unpaywall_open_access_status":null,"abstract":"Growing concerns on non-renewable fossil fuel resources and anthropogenic emissions of greenhouse gases have drawn attention to the development of sustainable and renewable energies through the use of functional nanostructures. A sustainable approach that can yield multiple advantages is the engineering of nanostructures from recycling of electronic waste (e-waste) materials. The present work reports a simplified, high-yield, and controllable strategy to fabricate Cu-based heterojunction ultrathin films with a stratified structure, in which the number, composition, and structure of layers can be tailored, through an assembly of two-dimensional (2D) Cu-based nanosheets. As electrodeposited, the bilayer Cu/Cu2O-Cu(OH)2 exhibited a pseudocapacitance behaviour, showing high power density with a promising potential for energy storage applications. Rapid, low-temperature thermal treatment then led to a partial transformation of Cu and Cu2O-Cu(OH)2 layers into CuO, resulting in the formation of a trilayer heterojunction ultrathin film with high energy harvesting performance as a photocathode for hydrogen production, where the significantly improved electron/hole separation and increased number of active sites across the interfacial regions resulted in an outstanding photoelectrochemical current density of 2.6 mA·cm-1 at -0.6 V vs. Ag/AgCl. Lastly, a Life Cycle Assessment (LCA), comparing three different scenarios from which the pristine material is obtained (i.e., recycled or pure resources), was conducted to evaluate environmental impacts associated with the recycling and production processes of such nanomaterials. The LCA results highlighted the importance of such value-added recycling on the environment, and the immense potential of e-waste applicability in developing advanced functional nanomaterials.","claims":[{"public_id":"cl_51aaff55ea0fdee333a861d1234babaa","status":"active","text":"A simplified, high-yield, and controllable assembly of two-dimensional Cu-based nanosheets enables fabrication of stratified Cu-based heterojunction ultrathin films with tunable number, composition, and structure of layers.","confidence":0.96,"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_51aaff55ea0fdee333a861d1234babaa"},{"public_id":"cl_e89352696abc7f02c9813df7ff461ea8","status":"active","text":"Life Cycle Assessment comparing recycled and pure-resource scenarios indicates that value-added recycling has important environmental benefits for producing these nanomaterials.","confidence":0.91,"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_e89352696abc7f02c9813df7ff461ea8"},{"public_id":"cl_852437935287e106b0b8496fff0559c3","status":"active","text":"Rapid low-temperature thermal treatment partially converts the Cu and Cu2O-Cu(OH)2 layers into CuO, producing a trilayer heterojunction ultrathin film with improved photoelectrochemical performance as a photocathode for hydrogen production.","confidence":0.95,"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_852437935287e106b0b8496fff0559c3"},{"public_id":"cl_a28f515042cd907371da225472b3c87a","status":"active","text":"The as-electrodeposited bilayer Cu/Cu2O-Cu(OH)2 shows pseudocapacitive behavior and high power density, indicating promise for energy storage applications.","confidence":0.93,"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_a28f515042cd907371da225472b3c87a"},{"public_id":"cl_b0bd3d79d6395f6a80daf77877b1bb49","status":"active","text":"The trilayer heterojunction ultrathin film achieves an outstanding photoelectrochemical current density of 2.6 mA·cm-1 at -0.6 V vs. Ag/AgCl because of improved electron/hole separation and a larger number of active sites at interfacial regions.","confidence":0.97,"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_b0bd3d79d6395f6a80daf77877b1bb49"}],"concepts":[{"public_id":"co_12898921411ac906d6fbbcc40a2a39e7","status":"active","name":"bilayer 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