Carbon-Coated MoSe2/MXene Hybrid Nanosheets for Superior Potassium Storage
Carbon-Coated MoSe2/MXene Hybrid Nanosheets for Superior Potassium Storage
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DOI：
10.1021/acsnano.8b09548
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发表时间：
2019-03-01
期刊：
影响因子：
17.1
通讯作者：
Zhang, Lei
中科院分区：
文献类型：
--
作者：
Huang, Huawen;Cui, Jie;Zhang, Lei
钾离子电池（PIB）由于钾资源的高天然丰度而在大规模应用中吸引了强烈的兴趣。然而，K+的大半径使得电极材料难以适应重复的K+插入和提取。因此，开发用于PIB的高性能电极材料仍然是一个巨大的挑战。在此，我们提出了合理的设计和制造的分层碳涂覆的MoSe 2/MXene混合纳米片（MoSe 2/MXene@C）作为PIB的上级阳极材料。具体而言，高导电性MXene衬底可以有效地缓解MoSe 2纳米片的聚集并提高电子导电性。此外，碳层使我们能够增强复合结构，并进一步增强混合纳米片的整体导电性。同时，在MoSe 2纳米片和MXene薄片的界面处发现了强的化学相互作用，有助于促进电荷转移动力学和提高结构耐久性。因此，作为PIB的阳极材料，所得MoSe 2/MXene@C在100次循环后在200 mA g（-1）下实现了355 mA h g（-1）的高可逆容量，并且在10.0 A g（-1）下实现了183 mA h g（-1）的出色倍率性能。所提出的设计策略为开发更高效的PIB电极材料提供了很大的希望。
Potassium-ion batteries (PIBs) are attracting intensive interest for large-scale applications due to the high natural abundance of potassium sources. However, the large radius of K+ makes it difficult for electrode materials to accommodate the repeated K+ insertion and extraction. Thus, developing high-performance electrode materials for PIBs remains a great challenge. Herein, we present the rational design and fabrication of hierarchical carbon-coated MoSe2/MXene hybrid nanosheets (MoSe2/MXene@C) as a superior anode material for PIBs. Specifically, the highly conductive MXene substrate can effectively relieve the aggregation of MoSe2 nanosheets and improve the electronic conductivity. Moreover, the carbon layer enables us to reinforce the composite structure and further enhance the overall conductivity of the hybrid nanosheets. Meanwhile, strong chemical interactions are found at the interface of MoSe2 nanosheets and MXene flakes, contributing to promoting the charge-transfer kinetics and improving the structural durability. Consequently, as an anode material for PIBs, the resulting MoSe2/MXene@C achieves a high reversible capacity of 355 mA h g(-1) at 200 mA g(-1) after 100 cycles and an outstanding rate performance with 183 mA h g(-1) at 10.0 A g(-1). The presented design strategy holds great promise for developing more-efficient electrode materials for PIBs.