Effects of Boric acid and Hydrogen Evolution Reaction on the Morphology and Magnetic Property of Co-Ni on ITO Substrate

• Main Authors: Wei-Yan Lin, 林威延
• Other Authors: Huei-Ying Ho
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/05712687424247538488

碩士 === 國立臺北教育大學 === 自然科學教育學系碩士班 === 101 === In this study, we used indium-tin-oxide (ITO) as working electrode and plated magnetic cobalt-nickel nanoparticles on it. We added different concentration of boric acid into the electrolyte and applied different working potential to vary the surface morphology and the magnetic properties of the Co-Ni nanoparticales. We used energy dispersive X-ray fluorescence (EDXRF) to measure the composition of Co-Ni nanoparticles; we used X-ray diffraction (XRD) to determine the structure with alloy phase diagram, we used scanning electron microscopy (SEM) to study the surface morphology. We investigated hysteresis curve and coercivity by using vibrating sample magnetometer (VSM). We found that boric acid acts as not only a buffering agent but also a diffusion barrier . Boric acid can adsorb on ITO and decrease current density. When the applied working potential is negative enough, hydrogen evolution reaction (HER) reacts on magnetic nanoparticles which makes the adsorbed boric acid to dissociate. This obviously affects the nucleation and growth modes of Co-Ni nanoparticles.