使用层状LDH纳米结构的氧化石墨烯壳的表面工程,ACS Applied Materials & Interfaces

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使用层状LDH纳米结构的氧化石墨烯壳的表面工程
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-05-15 00:00:00 , DOI: 10.1021/acsami.8b21265
Sarigamala Karthik Kiran ₁ , Shobha Shukla ₂ , Alexander Struck ₃ , Sumit Saxena ₂

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氧化石墨烯（GO）的发现由于其出色的物理化学性质，对各种研究领域都产生了深远的影响。然而，这些纳米结构的表面工程是提高表面性能的关键。在这里，我们介绍了通过在rGO壳上径向接枝Ni-Co层状双氢氧化物（LDH）薄片以形成Ni-Co的还原GO（rGO）壳的表面工程技术，从而形成了Ni-Co。树突状细胞状三维（3D）分层形态。二氧化硅纳米球在GO壳还原过程中形成自我牺牲模板，从而在模板辅助合成过程中形成rGO壳。LDH薄层在GO壳上进行水热过程期间的径向生长提供了访问大量额外的活性氧化还原位点的途径，并在GO还原形成rGO壳的过程中过度补偿了伪电容电荷存储中心的损失。这使得能够合成新颖的表面工程化rGO纳米壳，该壳具有大的表面积，增强的氧化还原位点，高孔隙率和易于离子运输的特性。Ni-Co的这些合成的3D树突状细胞状形态[受电子邮件保护]显示约2640 F g的高电容^–1。使用这种纳米材料制造的柔性混合器件在1 A g ^–1下显示出约35 Wh kg ^–1的高能量密度和750 W kg ^–1的功率密度。在弯曲条件下，没有观察到器件性能的明显下降。此合成策略可用于开发对潜在应用有用的功能材料，包括传感器，催化剂和能量存储。

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Surface Engineering of Graphene Oxide Shells Using Lamellar LDH Nanostructures

The discovery of graphene oxide (GO) has made a profound impact on varied areas of research due to its excellent physicochemical properties. However, surface engineering of these nanostructures holds the key to enhanced surface properties. Here, we introduce surface engineering of reduced GO (rGO) shells by radially grafting Ni–Co layered double hydroxide (LDH) lamella on rGO shells to form Ni–Co [email protected] The morphology of synthesized Ni–Co [email protected] mimics dendritic cell-like three-dimensional (3D) hierarchical morphologies. Silica nanospheres form self-sacrificial templates during the reduction of GO shells to form rGO shells during the template-assisted synthesis. The radial growth of LDH lamellae during hydrothermal process on GO shells provides access to a significantly larger number of additional active redox sites and overcompensates the loss of pseudocapacitive charge storage centers during the reduction of GO to form rGO shells. This enables in the synthesis of novel surface-engineered rGO nanoshells, which provide large surface area, enhanced redox sites, high porosity, and easy transport of ions. These synthesized 3D dendritic cell-like morphologies of Ni–Co [email protected] show a high capacitance of ∼2640 F g^–1. A flexible hybrid device fabricated using this nanomaterial shows a high energy density of ∼35 Wh kg^–1 and a power density of 750 W kg^–1 at 1 A g^–1. No appreciable compromise in device performance is observed under bending conditions. This synthesis strategy may be used in the development of functional materials useful for potential applications, including sensors, catalysts, and energy storage.

更新日期：2019-05-15

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