RuO₂ formation on electrodeposited black ruthenium at acidic and alkaline conditions

Authors

Marie Joshua Tapas National Institute of Physics, University of the Philippines Diliman
Mitch Irene Kate Galvan National Institute of Physics, University of the Philippines Diliman
Roland Sarmago National Institute of Physics, University of the Philippines Diliman

Abstract

Black ruthenium was electrodeposited on gold-plated silver substrates. Results show that plating at 0.090A for 5 mins at 65^oC yields a smooth, even, and well-adherent Ru deposit. Electrodes produced with these parameters were anodized in 0.50M H₂SO₄ and 0.50M KOH at varying anodization voltages (1.5V, 2V,2.5V and 3V) and varying anodization times (1min, 2mins, 3 mins and 30 mins). Anodization results show than Ru is stable in H₂SO₄ at potentials below or equal to 1.5V and heavily corrodes at potentials higher. At 3V almost complete removal of Ru deposit was observed after just 3 mins. In KOH, Ru dissolves at 1.5V which means Ru is more stable in acidic than in alkaline environment. Moreover, the surface morphology of Ru anodized in H₂SO₄ is smooth as opposed to that in KOH which has increased porosity and presence of voids. Hence, although XRD confirmed the presence of RuO₂ after anodization in both media, anodization in H₂SO₄is preferred due to heavy dissolution of Ru in KOH.

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Issue

2011: Proceedings of the 29th Samahang Pisika ng Pilipinas National Physics Congress

Article ID

SPP2011-PA-28

Section

Poster Session PA

Published

2011-10-24

How to Cite

[1]

MJ Tapas, MIK Galvan, and R Sarmago, RuO2 formation on electrodeposited black ruthenium at acidic and alkaline conditions, Proceedings of the Samahang Pisika ng Pilipinas 29, SPP2011-PA-28 (2011). URL: https://proceedings.spp-online.org/article/view/SPP2011-PA-28.