Ni(OH)2@Ni core-shell nanochains as low-cost high-rate performance electrode for energy storage applications

Abstract

Energy storage performances of Ni-based electrodes rely mainly on the peculiar nanomaterial design. In this work, a novel and low-cost approach to fabricate a promising core-shell battery-like electrode is presented. Ni(OH) 2 @Ni core-shell nanochains were obtained by an electrochemical oxidation of a 3D nanoporous Ni film grown by chemical bath deposition and thermal annealing. This innovative nanostructure demonstrated remarkable charge storage ability in terms of capacity (237 mAh g −1 at 1 A g −1 ) and rate capability (76% at 16 A g −1 , 32% at 64 A g −1 ). The relationships between electrochemical properties and core-shell architecture were investigated and modelled. The high-conductivity Ni core provides low electrode resistance and excellent electron transport from Ni(OH) 2 shell to the current collector, resulting in improved capacity and rate capability. The reported preparation method and unique electrochemical behaviour of Ni(OH) 2 @Ni core-shell nanochains show potential in many field, including hybrid supercapacitors, batteries, electrochemical (bio)sensing, gas sensing and photocatalysis.

High intrinsic activity of the oxygen evolution reaction in low-cost NiO nanowall electrocatalysts

“…4,5,11,[14][15][16] NiO-based nanostructures have already shown very proficient catalytic actions in sensing, electrochromical smart windows, supercapacitors and energy applications. [17][18][19][20][21][22][23] Such materials have great potential to work also as an efficient backboneplatform electrocatalyst for both the HER and the OER. Doping or alloying with Fe, Co, and Mn shows a large improvement in the performance of the Ni electrocatalyst for the OER, probably due to the optimization of the OH À bonding within the active sites.…”

“…These data and relative discussion shed a new light on the basic mechanisms of the OER process in Ni-based nanostructures. 22 The solution was heated up to 50 1C and kept at this temperature using a bain-marie setup. The substrates were immersed in CBD solution for a period of time ranging from 3 to 20 min, in order to achieve growth of Ni(OH) 2 NW films with different thicknesses.…”

Electrochemical Synergies of Heterostructured Fe2O3-MnO Catalyst for Oxygen Evolution Reaction in Alkaline Water Splitting

“…The current density and peak area in the CV curve are closely related to the reversible redox reaction and the electrical active surface area [30]. In all NF-based catalysts, the peak area is expanded by increasing the volume of Ni(OH) 2 /NiOOH with cyclic repetition according to the following equations [31].…”

Electrochemical Synergies of Heterostructured Fe₂O₃-MnO Redox Couple for Oxygen Evolution Reaction in Alkaline Water Splitting

“…The current density and peak area in the CV curve are closely related to the reversible redox reaction and the electrical active surface area [18]. In all NF-based catalysts, the peak area is expanded by increasing the volume of Ni(OH)2/NiOOH with cyclic repetition according to the following equations [19].…”