Abstract
This work reports on oxygen evolution reaction (OER), studied at nickel wire electrode material. Electrocatalytic behavior of non-oxidized and electrooxidized Ni wire samples was evaluated in 0.1 mol dm-3 NaOH solution for the potential range: 1600-2000 mV vs. RHE. The performance of nickel electrodes was examined by alternating current (a.c.) impedance spectroscopy, cyclic voltammetry and Tafel polarization measurements. Electrochemical oxidation of Ni wire radically increased the kinetics of the OER, exhibited through reduced charge-transfer resistance parameter and considerably modified Tafel polarization slopes.
Highlights
The growth of environmental problems in regard to increasing demand for fossil fuels and energy encourages the world community to search for new energy technologies that will provide an acceptable level of pollution and, at the same time, would not slow down economic growth
An energydispersive X-ray spectroscopy (EDS) analysis was employed to determine the difference in the content of oxygen between “as received”
The Scanning electron microscopy (SEM) micrograph pictures of both electrodes did not show any visible difference between the electrodes (Figure 1c: “as received” and Figure 1d: oxidized Ni electrode)
Summary
The growth of environmental problems in regard to increasing demand for fossil fuels and energy encourages the world community to search for new energy technologies that will provide an acceptable level of pollution and, at the same time, would not slow down economic growth. *e-mail: tomasz.mikolajczyk@uwm.edu.pl alloys and Ni-based superalloys are used in aviation, shipbuilding and chemical industry).[15,16] Because of its low cost, high corrosion resistance in alkaline solutions and good electrocatalytic properties, Ni and its alloys are commonly used as materials for alkaline water electrolysis and, as a result, for the production of relevant equipment.[17,18,19,20,21] In this paper, the OER was conducted on nickel wire (nonoxidized and electrooxidized) electrodes in 0.1 mol dm-3 NaOH electrolyte, primarily by means of alternating current (a.c.) impedance spectroscopy examinations.
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