Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7719598 | International Journal of Hydrogen Energy | 2014 | 10 Pages |
Abstract
Within the framework of this work, spinel-type ternary transition metal oxides of nickel, cobalt and iron with the composition FexNi1âxCo2O4 (0 â¤Â x â¤Â 1) were prepared and tested as promising electrocatalysts for the oxygen evolution reaction (OER) in alkaline water electrolysis. The hydroxide precipitation method was used for the synthesis. The morphology, structure and specific surface area of the prepared electrocatalysts were determined by means of scanning electron microscopy, X-ray diffraction, energy dispersive X-ray spectroscopy, the Brunauer Emmet Teller method and X-ray photo electron spectroscopy. The electrochemical properties were tested by thin-film technique on a rotating disk electrode and in a single-cell laboratory water electrolyzer coupled with electrochemical impedance spectroscopy. The OER studies indicate that substitution of Ni by Fe increases the electrocatalytic activity of the resulting material significantly. The highest activity was achieved for x = 0.1. Whereas the current density obtained using a pure nickel anode in the water electrolysis test was 54 mA cmâ2 at a cell voltage of 1.85 V, in the case of the anode modified with NiCo2O4 catalyst the value was 87 mA cmâ2. Using ternary transition metal oxides in the water electrolysis test and under identical conditions, the catalyst with the highest activity displayed a current density of 115 mA cmâ2.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Debabrata Chanda, JaromÃr Hnát, Martin Paidar, Karel Bouzek,