Rationally engineered 3D-dendritic cell-like morphologies of LDH nanostructures using graphene-based core\u2013shell structures

Karthik Kiran Sarigamala,Sumit Saxena,Shobha Shukla,Alexander Struck

doi:10.1038/s41378-019-0114-x

Abstract

Functionalization of graphene-based materials using chemical moieties not only modify the electronic structure of the underlying graphene but also enable in limited enhancement of targeted properties. Surface modification of graphene-based materials using other nanostructures enhances the effective properties by minimally modifying the properties of pristine graphene backbone. In this pursuit, we have synthesized bio-inspired hierarchical nanostructures based on Ni–Co layered double hydroxide on reduced graphene oxide core–shells using template based wet chemical approach. The material synthesized have been characterized structurally and electrochemically. The fabricated dendritic morphology of the composite delivers a high specific capacity of 1056 Cg−1. A cost effective solid state hybrid supercapacitor device was also fabricated using the synthesized electrode material which shows excellent performance with high energy density and fast charging capability.

Highlights

The increasing demand for non-conventional energy generation and storage has led to urgent need for exploration of novel materials systems and morphologies[1,2,3,4,5,6,7]
Even though carbon core–shell-based materials have been explored for lithium-ion batteries, their application in supercapacitors is limited21,22. 3D core–shell nanostructured NiCo-LDH@CNTs carbon as electrode materials for supercapacitors exhibit a high specific capacitance of 1023 Cg−1 at 1 Ag−1due its unique structural design, Sarigamala et al Microsystems & Nanoengineering (2019)5:65 good electrical conductivity and large specific surface area[23]
LDH lamellae which are radially self-assembled over the reduced graphene oxide (rGO) core structures show enhanced electrochemical performances due to good electrical conductivity, high specific surface area and good stability

Summary

Introduction

The increasing demand for non-conventional energy generation and storage has led to urgent need for exploration of novel materials systems and morphologies[1,2,3,4,5,6,7]. 3D core–shell nanostructured NiCo-LDH@CNTs carbon as electrode materials for supercapacitors exhibit a high specific capacitance of 1023 Cg−1 at 1 Ag−1due its unique structural design, Sarigamala et al Microsystems & Nanoengineering (2019)5:65 good electrical conductivity and large specific surface area[23]. LDH lamellae which are radially self-assembled over the rGO core structures show enhanced electrochemical performances due to good electrical conductivity, high specific surface area and good stability. They provide large number of active sites for participating in the redox process to obtain high specific capacitance.

Methods

Results

Conclusion