| 초록 |
Nanoscaled electrocatalysts have provided promising activity and stability because of its high surface areas, complicated morphologies. Behavior of degradation according to plating thickness for Oxygen Evolution Reaction(OER) was investigated. The Ni(OH)₂ catalysts were electrodeposited on carbon paper at -6mA for various times at room temperature, and OER was measured in 1M KOH between 0 and 0.9V(V vs Hg/HgO) at a scan rate of 5.0 mV/s. The oxidation states were investigated by in situ X-ray absorption near edge structure (XANES) for identify the OER mechanism of Ni(OH)₂. Also, stability was determined by the ratio of the first anodic current peak to cathodic current peak. Overall, it was demonstrated that for the first cycle, there is a phase conversion of α-Ni(OH)₂ to γ- NiOOH, and it is reduced to β-Ni(OH)₂, it changes to β-NiOOH for the rest of the cycle. In addition, the thinner the plating, the more reversible it is. |
