RuO₂ formation on electrodeposited black ruthenium at acidic and alkaline conditions

Authors

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