Title : Magnetic field assisted electrochemical synthesis of Co-Ru nanorods for water splitting reaction
The article presents results of tests on potentiostatic electrodeposition of ruthenium and Co-Ru alloys. The tests applying cyclic voltammetry method with the use of gold disk electrode (RDE) allowed to define a potentials range in which it is possible to obtain ruthenium and its alloys with cobalt from acid chloride electrolytes. The influence of electrodeposition parameters and the electrolyte composition on the composition, morphology and structure of the obtained deposits was determined. Co-Ru alloys underwent XRD tests, an analysis with the XRF method and observations using scanning electron microscopy (SEM). Hydrogen evolution tests have been also performed.Then, cobalt-ruthenium nanorods have been successfully synthesized by electrochemical deposition using an aluminum oxide membrane template with superimposed external magnetic field. The length and average diameter of cobalt alloy nanorods arrays are 4,5 - 9 µm and 100 nm, respectively. For nanorods deposited in applied external magnetic field of 0.6T we observe higher saturation magnetization and slightly higher coercivity field. This method offers a convenient and efficient path to synthesize metal array nanostructures with designed composition.