Tailoring Structural and Electrochemical Properties of Composite Ni-Based Electrocoatings

Abstract:

Oxygen electroevolution reaction (OER) was studied in alkaline medium on the Ni-P+TiO₂ composite electrocoatings obtained from the Watts type bath containing the suspension of TiO₂ particles. The comparable Ni-P coatings were electrodeposited from the supporting electrolyte without titanium dioxide. The galvanostatic electrodeposition of all coatings was conducted on a polycrystalline copper substrate at the deposition current density of 240 mA cm^-2 for 30 min. The electrolysis process was carried out at temperatures of 293-333 K. It was found that the mass increment and the content of TiO₂ in the obtained coatings is a decreasing function of the electrodeposition temperature. It was also acertained that the built-in TiO₂ as the composite component into the Ni-P matrix has no effect on the improvement of the electrocatalytic properties of the Ni-P+TiO₂ composite electrodes towards OER probably due to limitation of the size of the electrochemically active surface area of the electrode material obtained under proposed conditions.

• Periodical: Solid State Phenomena (Volume 228)
• Pages: 200-206
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.228.200
• Online since: March 2015
• Authors: Bożena Łosiewicz*, Magdalena Popczyk
• Keywords: Composite Electrocoatings, Ni-P+TiO₂, Oxygen Electroevolution Reaction

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