{"title":"An Energy-Efficient Tellurium Electrode Enabled by Cs2TeI6 Perovskite Structure for Durable Aqueous Zn-Te Batteries","authors":"Jinye Li, Chengjun Lei, Pengjie Jiang, Chen Xu, Tingting Liu, Xiao Liang","doi":"10.1039/d4ee02916j","DOIUrl":null,"url":null,"abstract":"Tellurium (Te) is a promising high-capacity electrode material for aqueous zinc-ion batteries, capable of multi-electron redox reactions. However, the inherent hydrolysis of oxidized Te4+ exhibits significant polarization during redox, rendering highly coupled with water in the electrolyte. This study presents a comprehensive investigation into regulating the multi-electron transfer redox chemistry of Te by incorporating cesium iodide (0.3 M CsI) into a low-concentration aqueous electrolyte (2 M ZnSO4), facilitating the formation of a stable Cs2TeI6 double perovskite during oxidation. This phase formation effectively suppresses the hydrolysis and dissolution of Te4+ species and decouples the redox reactions from water participation, leading to significantly reduced polarization. The CsI regulated Zn-Te battery delivers high energy efficiency of 92% for the 4-electron process (Te ⇌ Te4+) and high discharge capacity of 1248 mAh g-1 for the 6-electron process (Te2- ⇌ Te ⇌ Te4+). Furthermore, the 4-electron cell exhibits exceptional cycling stability, retaining 80% capacity after 1500 cycles. This study provides valuable insights into tailoring the redox chemistry of high-capacity electrode materials, paving the way for the development of high-performance aqueous battery systems.","PeriodicalId":72,"journal":{"name":"Energy & Environmental Science","volume":null,"pages":null},"PeriodicalIF":32.4000,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Energy & Environmental Science","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1039/d4ee02916j","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Tellurium (Te) is a promising high-capacity electrode material for aqueous zinc-ion batteries, capable of multi-electron redox reactions. However, the inherent hydrolysis of oxidized Te4+ exhibits significant polarization during redox, rendering highly coupled with water in the electrolyte. This study presents a comprehensive investigation into regulating the multi-electron transfer redox chemistry of Te by incorporating cesium iodide (0.3 M CsI) into a low-concentration aqueous electrolyte (2 M ZnSO4), facilitating the formation of a stable Cs2TeI6 double perovskite during oxidation. This phase formation effectively suppresses the hydrolysis and dissolution of Te4+ species and decouples the redox reactions from water participation, leading to significantly reduced polarization. The CsI regulated Zn-Te battery delivers high energy efficiency of 92% for the 4-electron process (Te ⇌ Te4+) and high discharge capacity of 1248 mAh g-1 for the 6-electron process (Te2- ⇌ Te ⇌ Te4+). Furthermore, the 4-electron cell exhibits exceptional cycling stability, retaining 80% capacity after 1500 cycles. This study provides valuable insights into tailoring the redox chemistry of high-capacity electrode materials, paving the way for the development of high-performance aqueous battery systems.
期刊介绍:
Energy & Environmental Science, a peer-reviewed scientific journal, publishes original research and review articles covering interdisciplinary topics in the (bio)chemical and (bio)physical sciences, as well as chemical engineering disciplines. Published monthly by the Royal Society of Chemistry (RSC), a not-for-profit publisher, Energy & Environmental Science is recognized as a leading journal. It boasts an impressive impact factor of 8.500 as of 2009, ranking 8th among 140 journals in the category "Chemistry, Multidisciplinary," second among 71 journals in "Energy & Fuels," second among 128 journals in "Engineering, Chemical," and first among 181 scientific journals in "Environmental Sciences."
Energy & Environmental Science publishes various types of articles, including Research Papers (original scientific work), Review Articles, Perspectives, and Minireviews (feature review-type articles of broad interest), Communications (original scientific work of an urgent nature), Opinions (personal, often speculative viewpoints or hypotheses on current topics), and Analysis Articles (in-depth examination of energy-related issues).