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Heterostructure of NiSe2/MnSe nanoparticles distributed on cross-linked carbon nanosheets for high-performance sodium-ion battery
Applied Surface Science ( IF 6.3 ) Pub Date : 2022-06-25 , DOI: 10.1016/j.apsusc.2022.154067
Lvlv Gao , Haibo Ren , Xiaojing Lu , Sang Woo Joo , Terence Xiaoteng Liu , Jiarui Huang

Heterostructure of NiSe2/MnSe nanoparticles distributed evenly over cross-linked N-doped carbon nanosheets (NM@NCNs) was developed as anode material via a hydrothermal strategy followed by an in situ selenization process. The anode delivered a high reversible capacity of 487 mAh g−1 at 5 A g−1 after 200 cycles and an excellent rate capacity of 269 mAh g−1 at a high current density of 10 A g−1. In particular, under −10 °C, the electrode still maintained a satisfactory rate capability for 271 mAh g−1 at 5 A g−1. The advanced electrochemical performance is related with the following merits. First, NiSe2/MnSe nanoparticles as bimetallic selenide can offer a higher specific capacity than monometallic selenide. Moreover, the rich redox-active sites provided by NiSe2/MnSe can accelerate the electrochemical reaction. Second, cross-linked NCNs with high electronic conductivity can serve as a substrate, preventing nanoparticle agglomeration and alleviating the variations in volume. Third, NiSe2/MnSe heterostructure proved by X-ray photoelectron spectroscopy (XPS) results can form lattice distortion, enhancing Na+ diffusion in the redox process. The possible electrochemical process was demonstrated by ex situ X-ray diffraction, and the Na+ diffusion rate of the NM@NCNs anode was calculated using the galvanostatic intermittent titration technique.



中文翻译:

NiSe2/MnSe纳米颗粒分布在交联碳纳米片上的异质结构用于高性能钠离子电池

通过水热策略和原位硒化工艺,将均匀分布在交联 N 掺杂碳纳米片 (NM@NCNs)上的 NiSe 2 /MnSe 纳米粒子的异质结构开发为负极材料。在 200 次循环后,负极在 5 A g -1下提供 487 mAh g -1的高可逆容量,在 10 A g -1的高电流密度下提供 269 mAh g -1的优异倍率容量。特别是在-10 ℃下,电极在5 A g -1下仍保持了令人满意的271 mAh g -1倍率性能。先进的电化学性能与以下优点有关。一、NiSe 2/MnSe纳米粒子作为双金属硒化物可以提供比单金属硒化物更高的比容量。此外,NiSe 2 /MnSe 提供的丰富的氧化还原活性位点可以加速电化学反应。其次,具有高电子电导率的交联 NCNs 可以作为基材,防止纳米颗粒团聚并减轻体积变化。第三, X射线光电子能谱(XPS)结果证明NiSe 2 /MnSe异质结构可以形成晶格畸变,增强氧化还原过程中的Na +扩散。通过非原位X 射线衍射证明了可能的电化学过程,Na +使用恒电流间歇滴定技术计算 NM@NCNs 阳极的扩散速率。

更新日期:2022-06-25
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