{"title":"Two-dimensional metallic CoTe2 flakes for electrocatalytic hydrogen evolution","authors":"Yu-Qing Zhao, Qian Liu, Bo-Jian Zhou, Guang Yang, Shao-Long Jiang","doi":"10.1007/s12598-024-02790-x","DOIUrl":null,"url":null,"abstract":"<p>Two-dimensional (2D) metallic 1T-CoTe<sub>2</sub> has attracted considerable attention due to its fascinating physical properties and promising applications in electronics and catalysis. However, the production of high-quality 2D 1T-CoTe<sub>2</sub> still remains challenging. Herein, we demonstrate a methodology to realize the facile synthesis of ultrathin, high-quality CoTe<sub>2</sub> flakes with a thickness down to 2.3 nm on mica substrates by an ambient-pressure chemical vapor deposition (CVD) technique. The atomic arrangement is verified by scanning transmission electron microscopy. The theoretical calculations uncover the metallic characteristic of 1T-CoTe<sub>2</sub> in the 2D limit. Remarkably, the CVD-derived 2D metallic CoTe<sub>2</sub> flakes for the hydrogen evolution reaction (HER) catalyst exhibit admirable performance, such as an overpotential of 186 mV at 10 mA·cm<sup>−2</sup>, a Tafel slope of 78 mV·dec<sup>−1</sup>, an exchange current density of 69 μA·cm<sup>−2</sup>, and negligible performance degradation after 1000 cycles. These results establish novel approaches for the synthesis and HER application of 2D metallic 1T-CoTe<sub>2</sub>.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":null,"pages":null},"PeriodicalIF":9.6000,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Rare Metals","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1007/s12598-024-02790-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
Two-dimensional (2D) metallic 1T-CoTe2 has attracted considerable attention due to its fascinating physical properties and promising applications in electronics and catalysis. However, the production of high-quality 2D 1T-CoTe2 still remains challenging. Herein, we demonstrate a methodology to realize the facile synthesis of ultrathin, high-quality CoTe2 flakes with a thickness down to 2.3 nm on mica substrates by an ambient-pressure chemical vapor deposition (CVD) technique. The atomic arrangement is verified by scanning transmission electron microscopy. The theoretical calculations uncover the metallic characteristic of 1T-CoTe2 in the 2D limit. Remarkably, the CVD-derived 2D metallic CoTe2 flakes for the hydrogen evolution reaction (HER) catalyst exhibit admirable performance, such as an overpotential of 186 mV at 10 mA·cm−2, a Tafel slope of 78 mV·dec−1, an exchange current density of 69 μA·cm−2, and negligible performance degradation after 1000 cycles. These results establish novel approaches for the synthesis and HER application of 2D metallic 1T-CoTe2.
期刊介绍:
Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.