Freestanding 3D Graphene–Nickel Encapsulated Nitrogen‐Rich Aligned Bamboo Like Carbon Nanotubes for High‐Performance Supercapacitors with Robust Cycle Stability

Abstract

3D hierarchical structures are reported based on graphene–nickel encapsulated nitrogen‐rich aligned bamboo like carbon nanotubes, which show not only high‐performance supercapacitance behavior but also a great robust cyclic stability. A facile synthesis route is developed of 2D nickel oxide decorated functionalized graphene nanosheets (2D‐NiO‐f:GNSs) hybrids and 3D nitrogen doped bamboo‐shaped carbon nanotubes (NCNTs) vertically standing on the functionalized graphene nanosheets (3D‐NCNT@f:GNSs) by using a thermal decomposition method. The chemical reduction and morphology‐dependent electrochemical response are investigated. The enhanced specific capacitance of 3D‐NCNT@f:GNSs as compared to that of 2D‐NiO‐f:GNSs suggests the synergistic effects and indicates the importance of energy storage and superior long‐term cycling performance that are achieved. This 3D‐NCNT@f:GNSs hybrid shows a remarkable cycling stability with a maximum power density of 12.32 kW kg−1 and maximum energy density of 109.13 Wh kg−1 due to the good connection of NCNT and f:GNSs. This unique 3D nano network architecture enables the availability of large surface areas of NCNT, thus endowing the nanohybrids with high specific capacitance and excellent reusability.

Synthesis, characterization, and application of nickel oxide/CNT nanocomposites to remove Pb2+ from aqueous solution

“…In recent years, metal oxide nanoparticles especially metal oxide/CNT nanocomposites have attracted a good deal of persistent interest because of their unique chemical, physical, electrical, and thermal properties [4][5][6]. These materials are widely used in several areas, including chemistry, physics, material science, biology, medicine, and environment [7,8].…”

Fabrication of interdigitated micro-supercapacitor devices by direct laser writing onto ultra-thin, flexible and free-standing graphite oxide films

“…Among the devices developed for better energy harvesting and storage, electrochemical supercapacitors have been extensively studied and proved to be an excellent option for energy storage. [1][2][3] Electrochemical supercapacitors have attracted vast attention due to higher power density and longer life cycle compared to batteries, and higher energy density than conventional dielectric capacitors. 4 The development of high performance electrical energy storage systems has been a major concern for industries as well as societies for the last few decades.…”

Hierarchically nanostructured transition metal oxides for supercapacitors

“…Thus, considerable efforts have been made to enhance the SC performance by creating composites of TMOs and carbon materials, such as TMOs/graphene and TMOs/ carbon nanofibers (CFs) [154][155][156][157][158][159][160][161][162][163][164][165][166][167]. The synthesized multi-component composites can maximize the benefits from all components [154][155][156][157][158][159][160][161][162][163][164][165][166][167][168][169].…”