{"title":"Evolutionary Zn Ion Storage Mechanism of Hierarchical Nanotubular Spinel FeV2O4 for Zinc–Metal Full Cells","authors":"","doi":"10.1016/j.ensm.2024.103637","DOIUrl":null,"url":null,"abstract":"<p>A fundamental understanding about the evolution of energy storage mechanism by the structure reconstruction during initial cycling is crucial in establishing their correlation with the unprecedented electrochemical performance of electrodes. Herein, we demonstrate evolutionary zinc (Zn) ion storage mechanism and kinetics of the hierarchical nanotubular FeV<sub>2</sub>O<sub>4</sub> (FeV<sub>2</sub>O<sub>4</sub>@NT) coated by turbostratic carbon layers through the anodic hydration-induced crystal reconstruction, where the smaller nanocrystalline FeV<sub>2</sub>O<sub>4</sub> spinel phase was embedded into the newly-formed amorphous V-O-Fe phase at the heterointerface. These FeV<sub>2</sub>O<sub>4</sub>@NT cathodes achieved the synergistically combined energy storage mechanism of intercalation and pseudocapacitance for the greatly improved electrochemical performance of pouch full cells, which was not achieved by existing spinel oxides. With the polyoxometalate modified Zn metal anode at the optimized condition of 3.0M Zn(OTf)<sub>2</sub>/(ACN/H<sub>2</sub>O-0.15) in the voltage range of [0.3-1.6 V (vs. Zn/Zn<sup>2+</sup>)], the POM-Zn||FeV<sub>2</sub>O<sub>4</sub>@NT full cells achieved a high capacity of 456.8 mAh g<sup>–1</sup> at 200 mA g<sup>–1</sup>, high rate capacity of 222.0 mAh g<sup>−1</sup> even at 10,000 mA g<sup>–1</sup>, and a large energy density of 337.5 Wh kg<sup>–1</sup>. Furthermore, the chemical pillar and Fe vacancies in the amorphous V-O-Fe phase allowed FeV<sub>2</sub>O<sub>4</sub>@NT electrode to achieve a low capacity decay rate of 0.0152% per each cycle over 1,000 cycles.</p>","PeriodicalId":306,"journal":{"name":"Energy Storage Materials","volume":null,"pages":null},"PeriodicalIF":18.9000,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Energy Storage Materials","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1016/j.ensm.2024.103637","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
A fundamental understanding about the evolution of energy storage mechanism by the structure reconstruction during initial cycling is crucial in establishing their correlation with the unprecedented electrochemical performance of electrodes. Herein, we demonstrate evolutionary zinc (Zn) ion storage mechanism and kinetics of the hierarchical nanotubular FeV2O4 (FeV2O4@NT) coated by turbostratic carbon layers through the anodic hydration-induced crystal reconstruction, where the smaller nanocrystalline FeV2O4 spinel phase was embedded into the newly-formed amorphous V-O-Fe phase at the heterointerface. These FeV2O4@NT cathodes achieved the synergistically combined energy storage mechanism of intercalation and pseudocapacitance for the greatly improved electrochemical performance of pouch full cells, which was not achieved by existing spinel oxides. With the polyoxometalate modified Zn metal anode at the optimized condition of 3.0M Zn(OTf)2/(ACN/H2O-0.15) in the voltage range of [0.3-1.6 V (vs. Zn/Zn2+)], the POM-Zn||FeV2O4@NT full cells achieved a high capacity of 456.8 mAh g–1 at 200 mA g–1, high rate capacity of 222.0 mAh g−1 even at 10,000 mA g–1, and a large energy density of 337.5 Wh kg–1. Furthermore, the chemical pillar and Fe vacancies in the amorphous V-O-Fe phase allowed FeV2O4@NT electrode to achieve a low capacity decay rate of 0.0152% per each cycle over 1,000 cycles.
期刊介绍:
Energy Storage Materials is a global interdisciplinary journal dedicated to sharing scientific and technological advancements in materials and devices for advanced energy storage and related energy conversion, such as in metal-O2 batteries. The journal features comprehensive research articles, including full papers and short communications, as well as authoritative feature articles and reviews by leading experts in the field.
Energy Storage Materials covers a wide range of topics, including the synthesis, fabrication, structure, properties, performance, and technological applications of energy storage materials. Additionally, the journal explores strategies, policies, and developments in the field of energy storage materials and devices for sustainable energy.
Published papers are selected based on their scientific and technological significance, their ability to provide valuable new knowledge, and their relevance to the international research community.