Hollow Cobalt Selenide-Carbon polyhedron sandwiched between reduced graphene oxide nanosheets: A superior anode material for lithium-ion batteries

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry Pub Date : 2024-09-12 DOI:10.1016/j.jelechem.2024.118651

引用次数: 0

Abstract

In this work, a double carbon-confined sandwich-like CoSe/NCP/rGO composite was fabricated using an self-assembled method combined with a selenization treatment. In the composite, cobalt selenide (CoSe) nanoparticles were embedded in N‑doped hollow carbon polyhedrons (NCP) and sandwiched between reduced graphene oxide (rGO) nanosheets. The kinetics of electron/ion transport along with the structural stability of the composite were significantly enhanced by the layer-by-layer sandwiched hollow structure and the strong cohesive interface interaction between various components. The CoSe/NCP/rGO, when serving as LIB’s anode material, exhibited excellent performance. It demonstrated a high specific capacity with the value of 843 mAh/g at 1 A/g, superior high-rate capability with capacity remaining at 309 mAh/g at 10 A/g, long-term cycling stability with no noticeable capability fading over 1000 loops. More importantly, these results were achieved without additional conductive agents.

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夹在还原氧化石墨烯纳米片之间的中空硒化钴-碳多面体：锂离子电池的优质负极材料

在这项研究中，采用自组装法结合硒化处理，制备出了一种类似 CoSe/NCP/rGO 的双碳夹层复合材料。在该复合材料中，硒化钴（CoSe）纳米粒子被嵌入掺杂了氮的空心碳多面体（NCP）中，并被夹在还原氧化石墨烯（rGO）纳米片之间。复合材料的逐层夹层中空结构和各组分之间的强内聚界面相互作用显著提高了电子/离子传输动力学和结构稳定性。CoSe/NCP/rGO 作为 LIB 的阳极材料表现出卓越的性能。它具有高比容量（1 A/g 时为 843 mAh/g）、卓越的高速率能力（10 A/g 时容量保持在 309 mAh/g）、长期循环稳定性（1000 次循环以上无明显能力衰减）。更重要的是，这些结果是在没有额外导电剂的情况下取得的。

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

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.