{"title":"Self-cleaning electrode for stable synthesis of alkaline-earth metal peroxides","authors":"Minli Wang, Jinhuan Cheng, Wenwen Xu, Dandan Zhu, Wuyong Zhang, Yingjie Wen, Wanbing Guan, Jinping Jia, Zhiyi Lu","doi":"10.1038/s41565-024-01815-x","DOIUrl":null,"url":null,"abstract":"<p>Alkaline-earth metal peroxides (MO<sub>2</sub>, M = Ca, Sr, Ba) represent a category of versatile and clean solid oxidizers, while the synthesis process usually consumes excessive hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>). Here we discover that H<sub>2</sub>O<sub>2</sub> synthesized via two-electron electrochemical oxygen reduction (2e<sup>−</sup> ORR) on the electrode surface can be efficiently and durably consumed to produce high-purity MO<sub>2</sub> in an alkaline environment. The crucial factor lies in the in-time detachment of in situ-generated MO<sub>2</sub> from the self-cleaning electrode, where the solid products spontaneously detach from the electrode to solve the block issue. The self-cleaning electrode is achieved by constructing micro-/nanostructure of a highly active catalyst with appropriate surface modification. In experiments, an unprecedented accumulated selectivity (~99%) and durability (>1,000 h, 50 mA cm<sup>−</sup><sup>2</sup>) are achieved for electrochemical synthesis of MO<sub>2</sub>. Moreover, the comparability of CaO<sub>2</sub> and H<sub>2</sub>O<sub>2</sub> for tetracycline degradation with hydrodynamic cavitation is validated in terms of their close efficacies (degradation efficiency of 87.9% and 93.6% for H<sub>2</sub>O<sub>2</sub> and CaO<sub>2</sub>, respectively).</p>","PeriodicalId":18915,"journal":{"name":"Nature nanotechnology","volume":null,"pages":null},"PeriodicalIF":38.1000,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nature nanotechnology","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1038/s41565-024-01815-x","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Alkaline-earth metal peroxides (MO2, M = Ca, Sr, Ba) represent a category of versatile and clean solid oxidizers, while the synthesis process usually consumes excessive hydrogen peroxide (H2O2). Here we discover that H2O2 synthesized via two-electron electrochemical oxygen reduction (2e− ORR) on the electrode surface can be efficiently and durably consumed to produce high-purity MO2 in an alkaline environment. The crucial factor lies in the in-time detachment of in situ-generated MO2 from the self-cleaning electrode, where the solid products spontaneously detach from the electrode to solve the block issue. The self-cleaning electrode is achieved by constructing micro-/nanostructure of a highly active catalyst with appropriate surface modification. In experiments, an unprecedented accumulated selectivity (~99%) and durability (>1,000 h, 50 mA cm−2) are achieved for electrochemical synthesis of MO2. Moreover, the comparability of CaO2 and H2O2 for tetracycline degradation with hydrodynamic cavitation is validated in terms of their close efficacies (degradation efficiency of 87.9% and 93.6% for H2O2 and CaO2, respectively).
期刊介绍:
Nature Nanotechnology is a prestigious journal that publishes high-quality papers in various areas of nanoscience and nanotechnology. The journal focuses on the design, characterization, and production of structures, devices, and systems that manipulate and control materials at atomic, molecular, and macromolecular scales. It encompasses both bottom-up and top-down approaches, as well as their combinations.
Furthermore, Nature Nanotechnology fosters the exchange of ideas among researchers from diverse disciplines such as chemistry, physics, material science, biomedical research, engineering, and more. It promotes collaboration at the forefront of this multidisciplinary field. The journal covers a wide range of topics, from fundamental research in physics, chemistry, and biology, including computational work and simulations, to the development of innovative devices and technologies for various industrial sectors such as information technology, medicine, manufacturing, high-performance materials, energy, and environmental technologies. It includes coverage of organic, inorganic, and hybrid materials.