Designing Core‐Shell Ni(OH)₂@CuO Nanowire Arrays on 3D Copper Foams for High‐Performance Asymmetric Supercapacitors

Abstract

Core-shell Ni(OH) 2 @CuO electrodes grown on three-dimensional copper foams were synthesized by a facile thermal oxidation and chemical bath deposition method. The electrochemical experiments present that the Ni(OH) 2 @CuO electrode delivers large areal capacitance (1.625 F cm À 2 at 3 mA cm À 2 ), excellent rate capacity (1.285 F cm À 2 at 30 mA cm À 2 ), and brilliant cycling stability (retaining 96.4 % after 5000 cycles). In addition, an asymmetric supercapacitor (ASC) device was designed taking Ni (OH) 2 @CuO electrode and active carbon (AC) as a positive and negative electrode, respectively. The ACS device exhibits a high voltage of 1.6 V and remarkable energy density up to 58.59 Wh kg À 1 at a power density of 686.45 W kg À 1 . This work may serve to develop new areas of low-cost materials for energy storage and conversion system.

Synthesis Ni-doped CuO nanorods via Successive Ionic Layer Deposition method and their capacitive performance

“…As shown in Fig. 5(a), two major peaks with binding energy 934.1 eV and 954.1 eV are corresponding to Cu 2p 3/2 and Cu 2p 1/2 , indicating that element Cu is the chemical state of 2+ in the sample [28]. The Ni 2p spectra (Fig.…”

Critical Aspects of Various Techniques for Synthesizing Metal Oxides and Fabricating Their Composite-Based Supercapacitor Electrodes: A Review

“…The Ni(OH) 2 nanoflake shell growth increased the number of electroactive sites available for redox reactions, and the resulting electrode exhibited an areal capacitance of 1.625 F cm −2 at a current density of 3 mA cm −2 . An SC device fabricated using Ni(OH) 2 @CuO and AC as a cathode and anode, respectively, exhibited a high energy density of 58.59 W h kg −1 at a power density of 686.45 W kg −1 [ 152 ]. Owing to their good electrical conductivities, high pseudocapacities, and chemical stabilities, binary MOs, such as MnCo 2 O 4 , ZnCo 2 O 4 , and NiCo 2 O 4 , are promising SC-electrode materials [ 153 , 154 , 155 ].…”

Facile fabrication of nanocomposites of nickel hydroxide and copper oxide for high performance asymmetric supercapacitors

“…There are several approaches to fabricate the electrode materials for HSs including (i) composite fabrication of carbonaceous materials with conducting polymers and/or transition metal oxides, [5] (ii) asymmetrically coupling an electrode active material of EDLCs with a battery-type electrode active material, [6] and (iii) fabrication of rechargeable battery-type nanomaterials, which possess novel structures to promote faster reactions between electroactive materials and electrolytes. [7] In the energy field, nanostructured transition metal oxides, metal hydroxides and phosphides are considered as promising candidates for diversity applications, such as, supercapacitors, lithium-ion batteries, gas sensors, and electrocatalysts. Among various materials for the supercapacitors, in specific, also referred to a promising positive electrode material for SPs due to its environmental friendliness and high theoretical specific capacity of 2358 F.g -1 .…”