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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >A novel spitball-like Co-3(NO3)(2)(OH)(4)@Zr-MOF@RGO anode material for sodium-ion storage
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A novel spitball-like Co-3(NO3)(2)(OH)(4)@Zr-MOF@RGO anode material for sodium-ion storage

机译：一种新型的烟球状二氧化碳（NO3）（2）（OH）（4）@ ZR-MOF @ RGO阳极材料，用于钠离子储存

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摘要

Metal-organic frameworks (MOFs) with 3D structure and tunable composition can provide more electrochemical active sites for redox reactions. They are expected to achieve stable cycles for reversible sodium ion storage. In this work, a novel spitball-like anode material for sodium-ion batteries (SIBs) has been prepared by a facile solvothermal method followed by the spray drying, in which the reduced graphene oxide (RGO) is coated on the composite of cobalt hydroxidenitrate (Co-3(NO3)(2)(OH)(4)) combined with the zircomiun based MOFs (Zr-MOF). The combination of Co-3(NO3)(2)(OH)(4) with Zr-MOF can not only improve the structural stability but also enlarge the specific surface area of anode materials. Meanwhile, the coating of spitball RGO can further improve the electric conductivity and the cycling stability of Co-3(NO3)(2)(OH)(4)@Zr-MOF composite effectively. As a result, such a composite anode can exhibit a high reversible capacity of 555 mAh g(-1) at 0.1 A g(-1) as well as a capacity retention ratio of 94.3% with discharge capacity of 525 mAh g(-1) after 100 cycles. Notably, the Co-3(NO3)(2)(OH)(4)@Zr-MOF@RGO anode can also deliver a high-rate capacity of 340 mAh g(-1) at 1 A g(-1). These results suggest that the Co-3(NO3)(2)(OH)(4)@Zr-MOF@RGO material is a promising anode to build the high-rate and long-life SIBs. (C) 2020 Elsevier B.V. All rights reserved.
机译：金属有机框架（MOF）具有3D结构和可调谐组合物可以为氧化还原反应提供更多的电化学活性位点。预计它们将实现可逆钠离子储存的稳定循环。在这项工作中，通过体面的溶剂热法制备了一种用于钠离子电池（SIBs）的新型烟球状阳极材料，然后通过喷雾干燥，其中将还原的石墨烯（RGO）涂覆在钴羟基硝酸钴的复合物上（CO-3（NO 3）（2）（2）（OH）（4））与基于锆芯片的MOF（ZR-MOF）相结合。 CO-3（NO 3）（2）（2）（OH）（4）的组合具有ZR-MOF，不能改善结构稳定性，而是扩大阳极材料的比表面积。同时，喷球rgo的涂层可以有效地提高CO-3（2）（2）（2）（2）（4）（4）+ Zr-MOF复合的循环稳定性。结果，这种复合阳极可以在0.1Ag（-1）下表现出555mAhg（-1）的高可逆容量，并且容量保持比为94.3％，放电容量为525mAhg（-1 ）100次循环后。值得注意的是，CO-3（NO 3）（2）（OH）（OH）（4）@ ZR-MOF @ RGO阳极还可以在1A（-1）下提供340mAhg（-1）的高速容量。这些结果表明CO-3（NO3）（2）（OH）（OH）（4）@ ZR-MOF @ RGO材料是一个有前途的阳极，以构建高速率和长寿命的SIB。 （c）2020 Elsevier B.v.保留所有权利。

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