{"title":"α-MnO2、β-MnO2和δ-MnO2作为水性锌离子电池正极材料的结构、化学、形态和电化学性能的比较研究","authors":"Basil Chacko, Madhuri Wuppulluri","doi":"10.1007/s40243-024-00281-8","DOIUrl":null,"url":null,"abstract":"<div><p>Aqueous zinc-ion batteries (AZIBs) are considered to be highly promising electrochemical energy storage device due to their affordability, inherent safety, large zinc resources, and optimal specific capacity. Among various cathode materials, manganese dioxide (MnO<sub>2</sub>) stands out for its high voltage, environmental benignity, and theoretical specific capacity. This study systematically investigates the phase formation and structural parameters of α-MnO<sub>2</sub>, β-MnO<sub>2</sub>, and δ-MnO<sub>2</sub> synthesized via hydrothermal method, employing Rietveld refinement. FTIR and Raman spectroscopy confirms Mn-O and O-H bond formation. BET analysis reveals surface areas, and pore size distribution is calculated with BJH method. High-resolution XPS spectra exhibit a spin energy split of ~ 11.9 eV for Mn 2p confirming the presence of MnO<sub>2</sub>. Electrochemical studies shows an initial discharge capacities of 230.5, 188.74 and 263.30 mAh g<sup>− 1</sup> at 0.1 A g<sup>− 1</sup> for α-MnO<sub>2</sub>, β-MnO<sub>2</sub> and δ-MnO<sub>2</sub>. The EIS spectra revealed the capacitive behaviour and electrode reaction kinetics where a R<sub>cT</sub> value of 484.14, 327.6, 162.5 Ω for α-MnO<sub>2</sub>, β-MnO<sub>2</sub> and δ-MnO<sub>2</sub>. These study give insights into relation of various properties of MnO<sub>2</sub> with electrochemical performance and its viability in grid storage applications.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":692,"journal":{"name":"Materials for Renewable and Sustainable Energy","volume":"14 1","pages":""},"PeriodicalIF":3.6000,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40243-024-00281-8.pdf","citationCount":"0","resultStr":"{\"title\":\"A comparative study on the structural, chemical, morphological and electrochemical properties of α-MnO2, β-MnO2 and δ-MnO2 as cathode materials in aqueous zinc-ion batteries\",\"authors\":\"Basil Chacko, Madhuri Wuppulluri\",\"doi\":\"10.1007/s40243-024-00281-8\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Aqueous zinc-ion batteries (AZIBs) are considered to be highly promising electrochemical energy storage device due to their affordability, inherent safety, large zinc resources, and optimal specific capacity. 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引用次数: 0
摘要
水溶液锌离子电池（AZIBs）具有价格低廉、安全性好、锌资源丰富、比容量优等优点，被认为是一种极具发展前景的电化学储能装置。在各种正极材料中，二氧化锰（MnO2）以其高电压、环境友好性和理论比容量而脱颖而出。本研究采用Rietveld细化法，系统研究了水热法制备α-MnO2、β-MnO2和δ-MnO2的相形成和结构参数。FTIR和拉曼光谱证实了Mn-O和O-H键的形成。BET分析显示比表面积，BJH法计算孔径分布。高分辨率XPS光谱显示Mn 2p的自旋能分裂为~ 11.9 eV，证实了MnO2的存在。电化学研究表明，α-MnO2、β-MnO2和δ-MnO2在0.1 A g−1下的初始放电容量分别为230.5、188.74和263.30 mAh g−1。EIS谱显示了α-MnO2、β-MnO2和δ-MnO2的电容行为和电极反应动力学，其RcT值分别为484.14、327.6和162.5 Ω。这些研究揭示了二氧化锰各种性能与电化学性能的关系及其在电网存储中的应用可行性。图形抽象
A comparative study on the structural, chemical, morphological and electrochemical properties of α-MnO2, β-MnO2 and δ-MnO2 as cathode materials in aqueous zinc-ion batteries
Aqueous zinc-ion batteries (AZIBs) are considered to be highly promising electrochemical energy storage device due to their affordability, inherent safety, large zinc resources, and optimal specific capacity. Among various cathode materials, manganese dioxide (MnO2) stands out for its high voltage, environmental benignity, and theoretical specific capacity. This study systematically investigates the phase formation and structural parameters of α-MnO2, β-MnO2, and δ-MnO2 synthesized via hydrothermal method, employing Rietveld refinement. FTIR and Raman spectroscopy confirms Mn-O and O-H bond formation. BET analysis reveals surface areas, and pore size distribution is calculated with BJH method. High-resolution XPS spectra exhibit a spin energy split of ~ 11.9 eV for Mn 2p confirming the presence of MnO2. Electrochemical studies shows an initial discharge capacities of 230.5, 188.74 and 263.30 mAh g− 1 at 0.1 A g− 1 for α-MnO2, β-MnO2 and δ-MnO2. The EIS spectra revealed the capacitive behaviour and electrode reaction kinetics where a RcT value of 484.14, 327.6, 162.5 Ω for α-MnO2, β-MnO2 and δ-MnO2. These study give insights into relation of various properties of MnO2 with electrochemical performance and its viability in grid storage applications.
期刊介绍：
Energy is the single most valuable resource for human activity and the basis for all human progress. Materials play a key role in enabling technologies that can offer promising solutions to achieve renewable and sustainable energy pathways for the future.
Materials for Renewable and Sustainable Energy has been established to be the world''s foremost interdisciplinary forum for publication of research on all aspects of the study of materials for the deployment of renewable and sustainable energy technologies. The journal covers experimental and theoretical aspects of materials and prototype devices for sustainable energy conversion, storage, and saving, together with materials needed for renewable fuel production. It publishes reviews, original research articles, rapid communications, and perspectives. All manuscripts are peer-reviewed for scientific quality.
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