On the kinetics of the hydrogen evolution reaction on Ni-MoOx composite catalysts in alkaline solutions

• Main Authors: Jović Borka M., Lačnjevac Uroš Č., Jović Vladimir D., Gajić-Krstajić Ljiljana M., Krstajić Nedeljko V.
• Format: Article
• Language: English
• Published: Serbian Chemical Society 2012-01-01
• Series: Journal of the Serbian Chemical Society
• Subjects: hydrogen evolution; nickel; molybdenum trioxide; composite catalyst; co-deposition
• Online Access: http://www.doiserbia.nb.rs/img/doi/0352-5139/2012/0352-51391100185J.pdf

MoO3 particles were co-deposited with Ni onto smooth or rough Ni supports from modified Watt’s baths of different compositions. Morphology and composition of the electrodeposits were characterized by means of cyclic voltammetry, X-ray diffraction, scanning electron microscopy, transmission electron microscopy and energy dispersive X-ray spectroscopy. The electrocatalytic activity of the composite catalysts for H2 evolution in alkaline solutions was determined by quasi-stationary polarization curves. Activity increases with MoOx content in the Ni deposit up to a limiting value. Composite Ni-MoOx catalyst performed high catalytic activity, similar to that of commercial Ni-RuO2 catalyst. Stability tests showed that Ni-MoOx codeposits are stable under condition of constant current and exhibit excellent tolerance to repeated short-circuiting.