Work

Kinetic analysis of Ni Co electrodeposition with saccharin using electrochemical impedance spectroscopy

Year: 2025

Type: article

Abstract: The reaction kinetics of nickel-cobalt alloy electrodeposition is investigated through Electrochemical Impedance Spectroscopy (EIS). Results revealed two primary effects of saccharin additives: reducing competition between hydrogen and metal adsorption, and inhibiting reaction by blocking active sites. At low saccharin concentrations, reduced competition led to rapid hydrogen evolution, resulting in non-uniform and rough microstructures. Conversely, saccharin's strong inhibition effect at higher concentrations yielded fine microstructures with mirror-like appearance. These microstructural changes significantly enhanced the mechanical and tribological properties of the electrodeposited film. Furthermore, the suppression of hydrogen reactions stabilized the local pH during the electrodeposition, producing high-quality metallic films with reduced oxide/hydroxide impurities. This study paves the way to understand the complex interplay of electroplating additives in metallic-alloy electrodeposition to optimize microelectronics fabrication.

Source: Electrochemistry Communications

DOI: 10.1016/j.elecom.2025.107912

Authors: Jae-Ik Choi, Inyeol Park, Suyeon Park, Min Jun Yi, Wonbong Jang, Jong Hyun Seo

Institutions: Purdue University West Lafayette, Korea Aerospace University

Language: English

Topic: Electrodeposition and Electroless Coatings

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,630

Funders: Ministry of Trade, Industry and Energy, National Research Foundation of Korea