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首页> 外文期刊>International Journal of Electrochemical Science >One-step Facile Synthesis of Hierarchically Porous Nitrogen- Doped SnO2 Nanoparticles with Ultrahigh Surface Area for Enhanced Lithium Storage Performance
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One-step Facile Synthesis of Hierarchically Porous Nitrogen- Doped SnO2 Nanoparticles with Ultrahigh Surface Area for Enhanced Lithium Storage Performance

机译：一步法合成具有超高表面积的多层多孔氮掺杂SnO 2 纳米颗粒以增强锂的存储性能

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In this work, one-step facile synthetic method was developed to obtain hierarchically porousnitrogen(N)-doped SnO2 nanoparticles that exhibit enhanced lithium storage performance with a highdischarge capacity of 590 mAh g-1 after 50 times cycles. The investigation by X-ray diffraction (XRD)and transmission electron microscopy (TEM) show that the crystal size of N-doped SnO2 nanoparticleswas controlled to 2-3 nm. Moreover, the N2 adsorption–desorption results suggest micropores (1.2 nm)and mesopores (< 5 nm) characters for N-doped SnO2 nanoparticles with ultrahigh specific areas(212.7 m2 g-1). The doping concentration of N tested by elemental analyzer was found to be 2.7 at%.X-ray photoelectron spectroscopy (XPS) and Electron paramagnetic resonance (EPR) measurementsfurther confirm that N doping results in the increase of the concentration of oxygen vacancy defects.The enhanced lithium storage performance of N-doped SnO2 nanoparticles can be ascribed to ultrafineparticle size, ultrahigh specific surface area, the high concentration of oxygen vacancy defects, as wellas the unique hierarchically porous structure. All the results indicated that the N-doped SnO2nanoparticles have a great potential for application as anodes for lithium ion batteries.
机译：在这项工作中，开发了一种简便的合成方法来获得分级掺杂多孔氮（N）的SnO2纳米颗粒，该纳米颗粒在50次循环后显示出增强的锂存储性能，并具有5​​90 mAh g-1的高放电容量。通过X射线衍射（XRD）和透射电子显微镜（TEM）的研究表明，N掺杂的SnO 2纳米颗粒的晶体尺寸被控制在2-3nm。此外，N2吸附-解吸结果表明，具有超高比表面积（212.7 m2 g-1）的N掺杂SnO2纳米颗粒具有微孔（1.2 nm）和中孔（<5 nm）特征。元素分析仪测试的N掺杂浓度为2.7 at％.X射线光电子能谱（XPS）和电子顺磁共振（EPR）测量进一步证实N掺杂导致氧空位缺陷浓度的增加。 N掺杂SnO2纳米颗粒的增强的锂储存性能可以归因于超细颗粒尺寸，超高比表面积，高浓度的氧空位缺陷以及独特的分层多孔结构。所有结果表明，N掺杂的SnO2纳米粒子具有很大的潜力，可作为锂离子电池的负极。

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