Reduced lattice spacing of birnessite type manganese dioxide/ expanded graphite cathode for stable aqueous zinc-ion batteries

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry Pub Date : 2024-10-22 DOI:10.1016/j.jelechem.2024.118732

Changxin Han , Juanjuan Cheng , Yun Ou , Longfei Liu , Yuxuan Xiao , Shuang Du , Changzhang Jian

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引用次数: 0

Abstract

Manganese oxides (MnO_x) have attracted much attention due to abundant resource, low cost and eco-friendliness. In this study, birnessite type manganese dioxide/expanded graphite composites (KMO/EG) with a reduced lattice spacing of nanoflower and nanowire heterostructure KMO have been synthesized by a one-step hydrothermal method. The morphology of KMO has transformed from nanoflower to nanowire with a reduced lattice spacing due to nucleation sites on the surface of EG. The KMO/EG achieves a specific capacity of 444.5mAh g⁻¹ and remains at 387.9mAh g⁻¹ after 100 cycles at 0.1 A g ⁻¹ for Zn-ion battery. The enhanced specific capacity of KMO/EG is mainly attributed to the capacity contribution of EG and the good stability is related to the more stable structure of KMO caused by reduced lattice spacing.

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用于稳定的锌-离子水电池的桦烷型二氧化锰/膨胀石墨阴极的缩小晶格间距

锰氧化物（MnOx）因资源丰富、成本低廉和生态友好而备受关注。本研究采用一步水热法合成了晶格间距缩小为纳米花和纳米线异质结构的桦烷型二氧化锰/膨胀石墨复合材料（KMO/EG）。由于 EG 表面存在成核点，KMO 的形态从纳米花转变为晶格间距减小的纳米线。KMO/EG 的比容量达到了 444.5mAh g-1，在 0.1 A g -1 的锰离子电池条件下循环 100 次后仍保持在 387.9mAh g-1。KMO/EG 比容量的提高主要归功于 EG 的容量贡献，而良好的稳定性则与晶格间距减小导致 KMO 结构更加稳定有关。

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来源期刊

Journal of Electroanalytical Chemistry 化学-电化学

CiteScore

7.80

自引率

6.70%

发文量

912

审稿时长

2.4 months

期刊介绍： The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied. Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.