The cathodic evolution of hydrogen on nickel in artificial seawater

BADEA, Gabriela Elena and MAIOR, Ioana and COJOCARU, Anca and CORBU, Ion (2007): The cathodic evolution of hydrogen on nickel in artificial seawater. Published in: Revue Roumaine de Chimie, 2007, 52(12), 1123–1130 (13 May 2023)

Abstract

The hydrogen evolution reaction (HER) on Ni electrode in artificial seawater was investigated by steady-state polarisation curves and electrochemical impedance spectroscopy methods at the room temperature and at high temperatures (30–60oC). The electrochemical kinetics parameters of the HER – Tafel slope, charge transfer coefficient and exchange current density – were evaluated in accordance with the potential scan direction and temperature. The Tafel slopes are significantly higher than 120 mV/decade and they increase with the increasing of the solution temperature. The charge transfer coefficient is lower than 0.5 and it decreases with temperature. The exchange current density has a magnitude order of 10-5 A·cm-2 and its value is increasing with increasing solution temperature. The activation energy of the HER has a moderate value, that slowly decreases with the cathodic polarisation increase. The HER is controlled by the charge transfer step and by the mass transfer of the intermediate reaction product Hads on the electrode surface.

• Item Type: MPRA Paper
• Language: English
• Keywords: Hydrogen, nikel, seawater
• Subjects: L - Industrial Organization > L6 - Industry Studies: Manufacturing > L61 - Metals and Metal Products ; Cement ; Glass ; Ceramics; L - Industrial Organization > L7 - Industry Studies: Primary Products and Construction > L74 - Construction; L - Industrial Organization > L9 - Industry Studies: Transportation and Utilities > L94 - Electric Utilities; L - Industrial Organization > L9 - Industry Studies: Transportation and Utilities > L97 - Utilities: General; O - Economic Development, Innovation, Technological Change, and Growth > O3 - Innovation ; Research and Development ; Technological Change ; Intellectual Property Rights > O31 - Innovation and Invention: Processes and Incentives; O - Economic Development, Innovation, Technological Change, and Growth > O3 - Innovation ; Research and Development ; Technological Change ; Intellectual Property Rights > O32 - Management of Technological Innovation and R&D; O - Economic Development, Innovation, Technological Change, and Growth > O3 - Innovation ; Research and Development ; Technological Change ; Intellectual Property Rights > O33 - Technological Change: Choices and Consequences ; Diffusion Processes

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