Facile synthesis of Ni(OH)₂ nanoarrays on graphene@carbon fabric as dual-functional electrochemical materials for supercapacitors and capacitive desalination

Abstract

This work reported the synthesis of dual-functional electrode Ni(OH)2 nanoarrays on RGO@carbon fabric nanocomposites with hierarchical nanostructures. The electrode showed decent performance on both supercapacitor and CDI.

Probing the Synergy of Ni(OH)2/NiO Nanoparticles Supported on rGO for Battery‐Type Supercapacitors

“…Under positive current density, the anodic peak appeared for Ni(OH) 2 at 0.42 V and for NiO at 0.38 V (vs. Ag/AgCl), indicating an oxidation process, whereas the cathodic peak appeared for Ni(OH) 2 at 0.16 V and NiO at 0.21 V against the reference electrode, anticipating the reduction process. The Faradaic reaction can be illustrated by Equation (1).…”

“…To address the current problems of pollution, there is an urgent need for a cost‐effective and environmentally friendly renewable energy source. [ 1,2 ] Therefore, energy storage devices have gained a significant interest and are considered to be candidates to meet the growing demands for power. Supercapacitors could be a promising energy storage technology with numerous applications.…”

Recent advances in Ni-materials/carbon nanocomposites for supercapacitor electrodes

“…In supercapacitors based on Ni(OH) 2 /carbon nanomaterials, the performance characteristics are improved. [49][50][51][52][53][54] The specific capacitance, power density, energy density, and cycle stability are important parameters in the classification of supercapacitors. Cycle stability refers to their ability to maintain a consistent performance over repeated charge and discharge cycles without significant degradation.…”

High-Performance Asymmetric Supercapacitor Using Ni(OH)2–Carboxyl Graphene Porous Nanomaterial with a Nanosheet-Assembled Microstructure

“…10−12 Nevertheless, small specific surface area and low conductivity lead to limited ion transport in Ni(OH) 2 , and its cycling stability is also affected as a result of structural damage resulting from changes in material volume during the charging/discharging cycle. 13 Hence, researchers have studied various modifications of Ni(OH) 2 electrode material: (i) increasing the charging/discharging rate by improving the specific surface area via microstructural adjustment, 14 (ii) enhancing the conductivity of carboxyl graphene (CG) and reducing the Ni(OH) 2 −CG intrinsic resistance via introduction of new functional groups to graphene, 15 and (iii) achieving a broad electrochemical window by selecting appropriate positive and negative electrode materials in asymmetric supercapacitors. 16 The currently used strategy to address this issue is to prepare composite material of nanocrystallized Ni(OH) 2 with conductive materials, like carbon nanotubes (CNTs), 17,18 activated carbon, 19−21 24 Zhang et al combined the one-step hydrothermal method with radio frequency (RF) magnetron sputtering to prepare a binder-free G@Ni(OH) 2 /NF electrode and were able to achieve a good rate performance.…”

“…In the past few years, supercapacitor electrode materials, such as transition metal oxide/hydroxide materials, transition metal sulfides, and carbon materials, have received extensive attention. Among them, hydroxide materials, especially Ni­(OH) 2 , have attracted great attention and have been a propitious concept for supercapacitor materials, owing to the high theoretical specific capacitance and environmental friendly nature. − Nevertheless, small specific surface area and low conductivity lead to limited ion transport in Ni­(OH) 2 , and its cycling stability is also affected as a result of structural damage resulting from changes in material volume during the charging/discharging cycle . Hence, researchers have studied various modifications of Ni­(OH) 2 electrode material: (i) increasing the charging/discharging rate by improving the specific surface area via microstructural adjustment, (ii) enhancing the conductivity of carboxyl graphene (CG) and reducing the Ni­(OH) 2 –CG intrinsic resistance via introduction of new functional groups to graphene, and (iii) achieving a broad electrochemical window by selecting appropriate positive and negative electrode materials in asymmetric supercapacitors .…”