Nanoarchitectonics of interstitial oxygen and Jahn-Teller distortion to enhance electrochemical performance of CuMnO2: symmetric coin-cell

IF 2.5 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Raushan Kabir, Roshni Begum, Kumar Riddhiman Sahoo, Sudipta Goswami, Sachindra Nath Das, Mohammad Rezaul Karim, Dipten Bhattacharya, Saikat Seth, Chandan Kumar Ghosh
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Abstract

In this work, influence of interstitial oxygen and Jahn-Teller distortion of Mn ions, tuned by varying alkali concentration during hydrothermal reaction, on the charge storage capacity of monoclinic CuMnO2 nanoplate electrodes has been investigated, followed by tuning them to improve the capacitance. CuMnO2 nanoplates, prepared at optimum pH, exhibits high specific capacity ∼ 120 F.g− 1 at 2 mVs− 1 scan rate using environment friendly electrolyte Na2SO4. Symmetric coin-cell, prepared with CuMnO2 nanoplates, exhibits specific capacitance ∼ 86.5 Fg− 1 at 2 mVs− 1 scan rate (∼ 71.2 Fg− 1 at 0.35 A/g), energy density ∼ 14.2 Wh/kg and power density ∼ 333.3 W/kg which make it a promising candidate for supercapacitor applications. It has been found that the charge transfer mechanism across electrode – electrolyte interface is governed by Marcus’s mechanism, wherein Jahn-Teller distortion plays most predominant role. Our theoretical analysis on the basis of density functional theory, provides better insight about the influence of interstitial oxygen on storage capacity. Herein, we have identified that interstitial oxygen tunes electron density on Mn3+ sites which in consequence facilitates specific capacitance. Our studies clearly reveal that CuMnO2 may be a potential, biocompatible pseudocapacitive energy storage material.

间隙氧的纳米结构和jhn - teller畸变对提高对称硬币电池电化学性能的影响
本文研究了水热反应中不同碱浓度调节的间隙氧和Mn离子的jan - teller畸变对单斜CuMnO2纳米板电极电荷存储容量的影响,并对其进行了调整以提高电容。使用环境友好型电解液Na2SO4,在最佳pH下制备的CuMnO2纳米板在2 mv−1扫描速率下表现出高比容量~ 120 F.g−1。用CuMnO2纳米片制备的对称硬币电池,在2 mv−1扫描速率下具有86.5 Fg−1的比电容(0.35 A/g时为71.2 Fg−1),能量密度为14.2 Wh/kg,功率密度为333.3 W/kg,这使其成为超级电容器应用的有希望的候选材料。研究发现,电极-电解质界面上的电荷转移机制受Marcus机制控制,其中Jahn-Teller畸变起主要作用。我们在密度泛函理论的基础上进行的理论分析,可以更好地了解间隙氧对储存容量的影响。在这里,我们已经确定了间隙氧调节了Mn3+位置上的电子密度,从而促进了特定电容。我们的研究清楚地表明,CuMnO2可能是一种潜在的、生物相容性的假电容储能材料。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Applied Physics A
Applied Physics A 工程技术-材料科学:综合
CiteScore
4.80
自引率
7.40%
发文量
964
审稿时长
38 days
期刊介绍: Applied Physics A publishes experimental and theoretical investigations in applied physics as regular articles, rapid communications, and invited papers. The distinguished 30-member Board of Editors reflects the interdisciplinary approach of the journal and ensures the highest quality of peer review.
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