Jia Yi, Jinsong Hu, Cheng Gong, Qilong Liu and Wentuan Bi
{"title":"Reaction-passivation-driven delamination of spent LiFePO4 cathodes and their upgrading to highly efficient catalysts for hydrogen evolution†","authors":"Jia Yi, Jinsong Hu, Cheng Gong, Qilong Liu and Wentuan Bi","doi":"10.1039/D4LF00423J","DOIUrl":null,"url":null,"abstract":"<p >2-Hydroxyphosphonic acid (HPAA) was demonstrated to delaminate spent LiFePO<small><sub>4</sub></small> cathodes from Al foil <em>via</em> a reaction-passivation mechanism, resulting in ultra-high-purity products and facilitating subsequent upgrading. As a proof of concept, Fe<small><sub><em>x</em></sub></small>P catalysts prepared from lithium-extracted FePO<small><sub>4</sub></small> slag deliver a hydrogen evolution current density of 10 mA cm<small><sup>−2</sup></small> at an overpotential of only 88 mV.</p>","PeriodicalId":101138,"journal":{"name":"RSC Applied Interfaces","volume":" 3","pages":" 634-637"},"PeriodicalIF":0.0000,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/lf/d4lf00423j?page=search","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"RSC Applied Interfaces","FirstCategoryId":"1085","ListUrlMain":"https://pubs.rsc.org/en/content/articlelanding/2025/lf/d4lf00423j","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
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Abstract
2-Hydroxyphosphonic acid (HPAA) was demonstrated to delaminate spent LiFePO4 cathodes from Al foil via a reaction-passivation mechanism, resulting in ultra-high-purity products and facilitating subsequent upgrading. As a proof of concept, FexP catalysts prepared from lithium-extracted FePO4 slag deliver a hydrogen evolution current density of 10 mA cm−2 at an overpotential of only 88 mV.
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