Journal of the Serbian Chemical Society 2012 Volume 77, Issue 2, Pages: 211-224
doi:10.2298/JSC110621185J
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On the kinetics of the hydrogen evolution reaction on Ni-MoOx composite catalysts in alkaline solutions

Jović Borka M., Lačnjevac Uroš Č., Jović Vladimir D., Gajić-Krstajić Ljiljana M., Krstajić Nedeljko V.

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.

Keywords: hydrogen evolution, nickel, molybdenum trioxide, composite catalyst, co-deposition