Hierarchical Ni–Co layered double hydroxide nanosheets entrapped on conductive textile fibers: a cost-effective and flexible electrode for high-performance pseudocapacitors

Abstract

Hierarchical three-dimensional (3D) porous nanonetworks of nickel-cobalt layered double hydroxide (Ni-Co LDH) nanosheets (NSs) are grown and decorated on flexible conductive textile substrate (CTs) via a simple two-electrode system based electrochemical deposition (ED) method. By applying a proper external cathodic voltage of -1.2 V for 15 min, the Ni-Co LDH NSs are densely deposited over the entire surface of the CTs with good adhesion. The flexible Ni-Co LDH NSs on CTs (Ni-Co LDH NSs/CTs) architecture with high porosity facilitates enhanced electrochemical performance in 1 M KOH electrolyte solution. The effect of growth concentration and external cathodic voltage on the electrochemical properties of Ni-Co LDH NSs/CTs is also investigated. The Ni10Co5 LDH NSs/CTs electrode exhibits a high specific capacitance of 2105 F g(-1) at a current density of 2 A g(-1) as well as an excellent cyclic stability as a pseudocapacitive electrode due to the advantageous properties of 3D interconnected porous frameworks of Ni10Co5 LDH NSs/CTs. This facile fabrication of bimetallic hydroxide nanostructures on CTs can provide a promising electrode for low-cost energy storage device applications.

Hierarchical ultrathin NiAl layered double hydroxide nanosheet arrays on carbon nanotube paper as advanced hybrid electrode for high performance hybrid capacitors

“…This means that the interfacial redox reactions are rapid enough under the given scan rates [19]. In addition, as plotted in the inset of Fig.…”

“…However, LDH suffers from its intrinsic low electrical conductivity and highly packed morphology, resulting in low rate performance and poor cycle life in supercapacitors [14,15]. To overcome this drawback, an effective approach is to design a binder-free electrode incorporating LDH with a conductive substrates such as conductive textile fibers [19], titanium plate [20], stainless steel [21] as well as nickel foam (NF) [22,23]. In such binder-free electrode approach, the traditional manufacture process of the slurry-derived electrode is neglected.…”

Ni(OH)2 nanosheets grown on porous hybrid g-C3N4/RGO network as high performance supercapacitor electrode

“…As presented in inset of Fig. 9D, the CNRG/Ni(OH) 2 displays a much smaller semicircle over the high frequency range, and a more upright line than those of pure Ni(OH) 2 , implying this hybrid composite possesses faster ion diffusion process and lower charge transfer resistance during the faradic reaction63. It can be concluded that the high electronic conductivity of the CNRG/Ni(OH) 2 can be ascribed to the unique structure of CNRG with large surface area and porous feature, which can make Ni(OH) 2 nanosheets keep highly interconnected with each other to facilitate the electron transport.…”

Ultrathin nickel hydroxide nanosheet arrays grafted biomass-derived honeycomb-like porous carbon with improved electrochemical performance as a supercapacitive material

“…Cyclic voltammetry (CV), galvanic charge-discharge (GCD) measurements and electrochemical impedance spectroscopy (EIS) were performed by using an IVIUMSTAT (The Netherlands) electrochemical interface system. The specific capacitance of the electrode materials was measured by GCD curves and can be estimated based on the following equation:25…”

“…Typically, the carbon-based materials (such as activated carbon and graphene materials) in EDLCs and transition metal oxides/hydroxide (Co 3 O 4 , MnO 2 , NiCo 2 O 4 , Co(OH) 2 , Ni(OH) 2 , etc.) in pseudocapacitors are being extensively investigated because of their low cost, less toxicity and versatility in structure and morphology171819202122232425. Despite the significant developments achieved in electroactive materials for EDLCs and pseudocapacitors, the suitability of these materials for practical applications is still limited because of their poor specific capacitance in carbon-based materials, while the relatively low power density and poor cycling stability usually occur in transition metal oxide/hydroxides31426.…”