Ni was activated by spontaneous deposition of Ru carried out in solns. of HCl contg. RuCl3. The occurrence of Ru deposition was confirmed by EDX and XPS and followed as a function of deposition time by cyclic voltammetry and Tafel lines for H2 evolution in 1 mol dm-3 KOH. Expts. were performed by varying temp., HCl as well as RuCl3 concn. The criticity of the presence of O2 in soln. was demonstrated. Ni activation by Ru is manifested by the appearance of H adsorption peaks in the voltammetric curve, and by the decrease of the Tafel slope for H2 evolution from a 120 mV for bare Ni to ca. 40 mV.
Electrocatalytic activation of Ni for H2 evolution by spontaneous deposition of Ru / I. Bianchi, E. Guerrini, S. Trasatti. - In: CHEMICAL PHYSICS. - ISSN 0301-0104. - 319:1-3(2005), pp. 192-199. [10.1016/j.chemphys.2005.06.042]
Electrocatalytic activation of Ni for H2 evolution by spontaneous deposition of Ru
I. Bianchi;E. Guerrini;S. Trasatti
2005
Abstract
Ni was activated by spontaneous deposition of Ru carried out in solns. of HCl contg. RuCl3. The occurrence of Ru deposition was confirmed by EDX and XPS and followed as a function of deposition time by cyclic voltammetry and Tafel lines for H2 evolution in 1 mol dm-3 KOH. Expts. were performed by varying temp., HCl as well as RuCl3 concn. The criticity of the presence of O2 in soln. was demonstrated. Ni activation by Ru is manifested by the appearance of H adsorption peaks in the voltammetric curve, and by the decrease of the Tafel slope for H2 evolution from a 120 mV for bare Ni to ca. 40 mV.
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