Electrodeposition of Nanoporous Nickel Layers Using Inductive Voltage Pulses

International Conference on Functional Materials and Nanotechnologies 2013

材料科学;物理学

Vanags, Martins^1 ; Kleperis, Janis^1 ; Bajars, Gunars^1 ; Nemcevs, Vladimirs^1

Institute of Solid State Physics, University of Latvia, Latvia^1

关键词: Efficient electrolysis;    Electrochemical impedance spectra;    Electrochemical measurements;    Electrode surfaces;    Hydrogen evolution reactions;    Inductive voltages;    Microscopic methods;    Variable amplitudes;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/49/1/012008/pdf
DOI  :  10.1088/1757-899X/49/1/012008

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

We used inductive voltage pulses for electro-deposition of porous nickel thin film onto steel electrode. Short pulses (tp2) were applied to electrode and resulting coating were analyzed with electrochemical and microscopic methods. At lower current densities only smooth nickel coatings growth, while at higher current densities the bubbles appear and porous layer was formed. Electrochemical impedance spectra of smooth and porous layers are measured in deionized water and in 1M KOH solution. The capacity in equivalent scheme is proportional to electrode surface, and from impedance spectra it is calculated that porous layer has 20 times larger active surface comparing to smooth layer (in KOH solution). From electrochemical measurements it is estimated that more efficient hydrogen evolution reaction occurs on electrode with porous nickel layer obtained at 223 A/dm2. It is shown in this work that inductive short pulse method can be used to obtain nano-porous nickel coatings on electrodes for efficient electrolysis cell.