The cathodic evolution of hydrogen on nickel in artificial seawater

Gabriela Elena Badea, Ioana Maior, Anca Cojocaru and Ion Corbu ()

MPRA Paper from University Library of Munich, Germany

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.

Keywords: Hydrogen; nikel; seawater (search for similar items in EconPapers)
JEL-codes: L61 L74 L94 L97 O31 O32 O33 (search for similar items in EconPapers)
Date: 2007-09-26
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Persistent link: https://EconPapers.repec.org/RePEc:pra:mprapa:117293

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