Template-Free Electrochemical Deposition and Characterization of Ni Nano/Microrod Arrays

Abstract

Vertical aligned arrays of Ni nano/microrods have been successfully fabricated via a galvanostatic electrolysis on Ti substrates without any hard templates and surfactants. Electrodeposition and cyclic voltammetry were conducted in a conventional three-electrode glass cell. Cyclic voltammetry was used to study the electrochemical reactions relevant to the film growth. The transfer coefficient and diffusion coefficient of Ni(II) became smaller with the decrease of the reaction temperature. SEM images indicate that the aspect ratio of the nano/microrods is about 11 and 3, respectively. It is found that the various morphologies of the products are dependent on the electrodeposition conditions, such as the deposition current densities, kinds of additives, substrates, pH, and deposition temperature. X-ray diffraction patterns show that the as-deposited nano/microrods are all cubic phase of Ni. TEM analyzes confirm the Ni microrods are single crystal and nanorods polycrystalline, respectively. The anti-corrosion property of Ni film with a polycrystalline structure is poor for its high degree of surface defects. Both the Ni nano/micro arrays exhibit excellent soft magnetic properties at room temperature and ferromagnetism at 5 K.

Hydrothermal Synthesis of Nickel Oxide Nanosheets for Lithium‐Ion Batteries and Supercapacitors with Excellent Performance

“…The electrode had a specific capacity of 1096 mA h g À1 after 40 cycles, which was much higher than that in previous reports. [27][28][29] This result indicated that the unique 2D, porous, layered NiO nanosheet structure could enhance the electrochemical properties, owing to the increased surface area. As a result, large contact interfaces between the electrode and electrolyte facilitate the reaction between lithium ions and NiO.…”

Investigation of structural and optical properties of ternary polyaniline–polypyrrole–nickel oxide (PANI‐PPy‐NiO) nanocomposite for optoelectronic devices

“…12,13 Specifically, nickel oxide (NiO) nanoparticles are considered as one of the most promising prospective fillers due to their excellent electrical and optical properties which provide a huge range of applications such as supercapacitors, electrochromic films, optoelectronic devices and fiber-optic gas sensors. 14,15 For instance, Suresh et al successfully prepared NiO nanoparticles by a co-precipitation method and studied their structural, morphological and optical properties. 16 Deshpande et al 17 synthesized NiO nanoparticles through the sol-gel method for optoelectronic device application.…”

Quantum Chemical Studies on NiO Nanoclusters

“…Nickel oxide has many applications such as in batteries [3], in electro chromic material [4], as an electrode in fuel cells [5] , in gas sensors [6], in thermistors [7], in optoelectronic devices [8], in gamma radiation sensors [9] and as catalyst [10]. Nickel oxide are good capacitors [11] and also act as a resistor [12].…”