Title Electrocatalytic reduction of water clusters on binary alloys of molybdenum with iron subgroup metals in an alkaline medium /
Translation of Title Електрокаталітичне відновлення кластерів води на бінарних сплавах молібдену з металами підгрупи заліза в лужному середовищі.
Authors Nikitenko, V. N ; Babenkov, E. A ; Bersirova, Oksana ; Kublanovsky, V. S
DOI 10.15407/hftp15.01.035
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Is Part of Xімія, фізика та технологія поверхні = Chemistry, physics and technology of surface.. Kyiv : Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine. 2024, vol. 15, no. 1, p. 35-42.. ISSN 2079-1704. eISSN 2518-1238
Keywords [eng] binary alloys Co-Mo ; electrocatalysis ; Fe-Mo ; hydrogen evolution reaction ; Ni-Mo ; system reorganization energy ; water clusters
Abstract [eng] The total reorganization energy of the system and its components, the solvent reorganization energy and the transformation energy of reactants (water clusters [(H2O)nOH]–), during electrocatalytic hydrogen evolution on binary alloys of molybdenum with iron subgroup metals (Fe, Co, Ni) in an alkaline medium (30 wt. % NaOH solution) have been calculated. The calculated values of the solvent reorganization energy and the reorganization energy of water clusters are in agreement with the Marcus – Dogonadze – Kuznetsov theory. The dependence of the total reorganization energy of the system, the solvent reorganization energy, and the reorganization energy of discharging species (water clusters) on the electrolyte temperature has been calculated. It was shown that the total reorganization energy of the system and the activation energy of the electron-transfer reaction of electrocatalytic hydrogen evolution (HER) on binary alloys of molybdenum with iron subgroup metals in an alcaline vedium (30 wt. % NaOH solution) decrease linearly with increasing electrolyte temperature in the following order: Fe-54 at. % Mo > Ni-54 at. % Mo > Co-52 at. % Mo. The temperature dependences of the water cluster discharge reorganization energy and the activation energy on binary molybdenum alloys are linear and intersect in the boiling point region of 30 wt. % NaOH solution 384.7 K. At this temperature, the electrode process is limited by the diffusion of regenerating water clusters to the electrode surface. The calculated diffusion activation energy Ad is 9.9 kJ∙mol–1. The value of the system reorganization energy λt is 39.8 kJ∙mol–1, which is consistent with the theory of Markus – Dogonadze – Kuznetsov. Electrocatalytic activity of binary alloys of molybdenum with iron subgroup metals at 30 wt. % NaOH solution at this temperature is maximum and does not depend on the nature of the alloy.
Published Kyiv : Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine
Type Journal article
Language English
Publication date 2024
CC license CC license description