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首页> 外文期刊>Chemical papers >Synthesis of Fe_3Se_4/ carbon composites from different metal–organic frameworks and their comparative lithium/sodium storage performances
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Synthesis of Fe_3Se_4/ carbon composites from different metal–organic frameworks and their comparative lithium/sodium storage performances

机译：Fe_3Se_4 /碳复合材料的合成不同的有机框架和他们比较锂/钠存储性能

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摘要

Synthesis of transition metal selenides from metal–organic frameworks (MOFs) has become one of the common methods, and their structure and properties are depended upon the MOFs. In this study, different Fe-based MOFs have been used to prepare Fe_3Se_4/ carbon composites by synchronous selenization and carbonization process. The Fe_3Se_4/ carbon composite obtained from Fe-Mil-88A possessing a rice-like structure is composed of numerous Fe_3Se_4 nanoparticles and abundant carbon, which has been observed by scanning/transmission electron microscope. X-ray photoelectron spectrums and thermogravimetric analysis indicate this Fe_3Se_4/ carbon composite composed of major Fe~(2+) and minor Fe~(3+) has a carbon content of 12.4wt%. As anode material of lithium-ion battery, the composite can deliver a discharge capacity of 707.4 mAh/g at 0.2 A/g after 100 cycles. Even at a high rate of 5 A/g, it still reaches a capacity value of 566.7 mAh/g. As anode material of sodium-ion battery, this composite retains a discharge capacity of 417.3 mAh/g at 0.2 A/g after 50 cycles, and a capacity value of 153.4 mAh/g can be reached at a high rate of 5 A/g. The good electrochemical performances are partially determined by high contribution of capacitive-controlled behaviors from the investigation on cyclic voltammetry. The electrochemical performance of this composite is better than that of the other one, which is derived from Fe-Mil-88B. The different energy storage performances determined by their structural difference also have been discussed in the text.
机译：过渡金属硒化物的合成(mof)已经成为有机框架常用的方法,它们的结构属性是取决于财政部。研究中,不同Fe-based财政部已经使用准备Fe_3Se_4 /碳复合材料同步selenization和碳化的过程。从fe - mil - 88 -拥有一个大米的结构是由无数Fe_3Se_4纳米粒子吗和丰富的碳,已观察到扫描透射电子显微镜。光电子光谱和热重分析表明这Fe_3Se_4 /碳复合材料由主要Fe ~(2 +)和次要Fe ~ (3 +)碳含量为12.4 wt %。锂离子电池复合可以交付放电容量0.2 707.4 mAh / g / g100年之后周期。它仍然达到566.7 mAh / g的容量值。作为钠电池的阳极材料,这复合保留放电容量为417.3mAh在0.2 A / g / g 50周期,和能力值为153.4 mAh / g可以达到在一个较高的水平5 A / g。表演部分由高的贡献capacitive-controlled行为从循环伏安法的调查。电化学性能的复合比另一个,这是来自fe - mil - 88 - b。存储性能由他们决定结构差异也被讨论文本。

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