Hydrothermal synthesis of cobalt telluride nanorods for a high performance hybrid asymmetric supercapacitor,RSC Advances

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Hydrothermal synthesis of cobalt telluride nanorods for a high performance hybrid asymmetric supercapacitor
RSC Advances ( IF 3.9 ) Pub Date : 2020-4-3 , DOI: 10.1039/c9ra08692g
M Manikandan ₁ , K Subramani _{2,

3} , M Sathish _{2,

3} , S Dhanuskodi ₁

Affiliation

Cobalt telluride nanostructured materials have demonstrated various applications, particularly in energy generation and storage. A high temperature and reducing atmosphere are required for the preparation of cobalt telluride-based materials, which makes this a difficult and expensive process. The development of a facile route for producing the desirable nanostructure of cobalt telluride remains a great challenge. We demonstrated a simple hydrothermal method for preparing cobalt telluride nanorods (CoTe NRs) and telluride nanorods (Te NRs) for supercapacitor applications. The morphology of CoTe NRs and Te NRs was analyzed using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The prepared CoTe NR electrode material exhibited a high specific capacity of 170 C g⁻¹ at a current density of 0.5 A g⁻¹ with an exceptional cyclic stability. The asymmetric supercapacitor was assembled using CoTe NRs and orange peel-derived activated carbon (OPAA-700) as a positive and negative electrode, respectively. The fabricated device delivered a high energy density of 40.7 W h kg⁻¹ with a power density of 800 W kg⁻¹ at 1 A g⁻¹ current density. When the current density was increased to 30 A g⁻¹, the fabricated device delivered a high power density of 22.5 kW kg⁻¹ with an energy density of 16.3 W h kg⁻¹. The fabricated asymmetric supercapacitor displayed a good cyclic stability performance for 10 000 cycles at a high current density of 30 A g⁻¹ and retained 85% of its initial capacity for after 10 000 cycles. The prepared materials indicate their applicability for high performance energy storage devices.

中文翻译：

用于高性能混合不对称超级电容器的碲化钴纳米棒的水热合成

碲化钴纳米结构材料已经展示了各种应用，特别是在能源产生和储存方面。制备碲化钴基材料需要高温和还原气氛，这使得该过程困难且昂贵。开发生产所需碲化钴纳米结构的简便途径仍然是一个巨大的挑战。我们展示了一种简单的水热法制备用于超级电容器应用的碲化钴纳米棒 (CoTe NRs) 和碲化物纳米棒 (Te NRs)。使用扫描电子显微镜 (SEM) 和透射电子显微镜 (TEM) 分析 CoTe NR 和 Te NR 的形态。制备的 CoTe NR 电极材料表现出 170 C g ^{-1的高比容量}在 0.5 A g ^-1的电流密度下具有出色的循环稳定性。不对称超级电容器分别使用 CoTe NRs 和橘皮衍生的活性炭 (OPAA-700) 作为正极和负极进行组装。制造的器件在 1 A g ^-1电流密度下提供 40.7 Wh kg ^-1的高能量密度和 800 W kg -1 的功率^密度。当电流密度增加到 30 A g ^-1时，制造的器件提供了 22.5 kW kg ^-1的高功率密度和 16.3 Wh kg -1 的能量^密度. ^{制造的非对称超级电容器在 30 A g -1}的高电流密度下 10 000 次循环表现出良好的循环稳定性能，并在 10 000 次循环后保持其初始容量的 85%。制备的材料表明它们适用于高性能储能装置。

更新日期：2020-04-03

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