用于超级电容器的具有超高电容和能量密度的氧空位富纳米孔 Ni/NiMnO3/MnO2@NiMn 电极,ACS Applied Materials & Interfaces

当前位置： X-MOL 学术 › ACS Appl. Mater. Interfaces › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

用于超级电容器的具有超高电容和能量密度的氧空位富纳米孔 Ni/NiMnO3/MnO2@NiMn 电极
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-01-20 , DOI: 10.1021/acsami.2c16818
Arpit Thomas ₁ , Ambrish Kumar ₁ , Gopinath Perumal ₁ , Ram Kumar Sharma ₂ , Vignesh Manivasagam ₃ , Ketul Popat ₃ , Aditya Ayyagari ₄ , Anqi Yu ₅ , Shalini Tripathi ₅ , Edgar Buck ₅ , Bharat Gwalani _{5,

6} , Meha Bhogra ₁ , Harpreet Singh Arora ₁

Affiliation

高性能储能设备 (HPED) 在实现清洁能源方面发挥着关键作用，从而实现了对无污染、绿色技术的总体追求。超级电容器是此类利润丰厚的 HPED 的一类；然而，超级电容器技术的一个严重限制因素是其低于标准的能量密度。本报告介绍了迄今为止未知的物理变形、化学脱合金和微观结构工程途径，用于生产超高电容、高能量密度的镍锰合金电极。活化电极在 0.5 A/cm ^{3时提供 2700 F/cm}³的超高比电容. 对称装置展示了 96.94 Wh/L 的出色能量密度和 10,000 次循环后保持 95% 的出色循环寿命。透射电子显微镜和原子探针断层扫描研究揭示了独特的分级微观结构的演变，该微观结构包含富含 MnO _{2的纳米薄片内的精细 Ni/NiMnO}₃纳米韧带。使用密度泛函理论的理论分析显示了纳米级富含氧空位的 NiMnO ₃结构的半金属性质，突出了有源区的载流子浓度和电子电导率的提高。此外，NiMnO _{3的几何模型}晶体显示出相对较大的空隙，可能为离子嵌入/脱嵌提供通道。目前的加工方法具有很强的适应性，可以应用于广泛的材料系统，以设计用于储能设备的高效电极。

"点击查看英文标题和摘要"

Oxygen-Vacancy Abundant Nanoporous Ni/NiMnO3/MnO2@NiMn Electrodes with Ultrahigh Capacitance and Energy Density for Supercapacitors

High-performance energy storage devices (HPEDs) play a critical role in the realization of clean energy and thus enable the overarching pursuit of nonpolluting, green technologies. Supercapacitors are one class of such lucrative HPEDs; however, a serious limiting factor of supercapacitor technology is its sub-par energy density. This report presents hitherto unchartered pathway of physical deformation, chemical dealloying, and microstructure engineering to produce ultrahigh-capacitance, energy-dense NiMn alloy electrodes. The activated electrode delivered an ultrahigh specific-capacitance of 2700 F/cm³ at 0.5 A/cm³. The symmetric device showcased an excellent energy density of 96.94 Wh/L and a remarkable cycle life of 95% retention after 10,000 cycles. Transmission electron microscopy and atom probe tomography studies revealed the evolution of a unique hierarchical microstructure comprising fine Ni/NiMnO₃ nanoligaments within MnO₂-rich nanoflakes. Theoretical analysis using density functional theory showed semimetallic nature of the nanoscaled oxygen-vacancy-rich NiMnO₃ structure, highlighting enhanced carrier concentration and electronic conductivity of the active region. Furthermore, the geometrical model of NiMnO₃ crystals revealed relatively large voids, likely providing channels for the ion intercalation/de-intercalation. The current processing approach is highly adaptable and can be applied to a wide range of material systems for designing highly efficient electrodes for energy-storage devices.

更新日期：2023-01-20

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南