부산대학교 도서관

This study was presented in 2 ways to improve the performance of the water electrolysis catalyst.Firstly, The novel solution route based on metal-organic decomposition (MOD) process is successfully developed for a facile preparation of CoFe2O4. It was deposited on carbon fiber papers (CFPs) and was thermally calcined at various temperatures (300 – 450℃) in a tube furnace under air, in order to evaluate the electrocatalytic OER properties. It is significantly found that a drastic cation redistribution in active sites within the spinel structure of 450 °C-calcinated CoFe2O4 leads to the dramatic enhancement in hole density and concomitant OER activity, including an overpotential (η10) of 359 mV at10 mA cm-2 and a Tafel slope of 53.8 mV dec-1 in 1 M KOH aqueous solution. Based on this work, elucidation of structure-OER activity relationships in spinel-type CoFe2O4 electrocatalysts will be able to advance further.Secondly, The effects of OER and HER catalysts due to phase change on VO2(M) were studied. The effect of the catalyst due to phase transition was greatly improved, which suggested usability as a catalyst for high-temperature metal phases.