| 초록 |
The water splitting process with electrocatalytic and photocatalytic, as one of the next generation energy conversion technology for producing hydrogen and oxygen molecules have been widely considered candidates to solve energy and environmental problems. Up to date, precious metal based oxide materials (RuO2 and IrO2) as the efficient active catalyst for the half reaction of the oxygen evolution reaction (OER) have been used, however, the high cost, poor stability, and scarcity of these metals hinder their widespread practical and technical use. Hence, extensive research activities have focused on the inexpensive earth-abundant metal based materials such as multi-composite transition metal (Ni, Fe, Mn Co, Mn, etc.) compounds (nitride, oxide and hydroxide) as candidate catalysts for efficient OER electrocatalyst. For the most Co based materials (semiconductors and insulators), the poor intrinsic conductivity lead to limit efficient OER performance. Surprisingly, metal nitrides (Co-Mo-N, Ni2Fe2N, Ni3N and CoxN) with metallic properties show high electrocatalytic abilities towards the HER and OER due to the superior intrinsic conductivity. Despite their promising OER performance, one of the challenging issues to improve electrolytic property is thus control of the morphology and shape including highly exposed reaction sites, surface permeability and enhanced cycling performance. In this study, we focused on the monodispersed and mesoporous CoxN nanocubes based on simple nitridation via Prussian blue analogue (PBA) of Co3[Co(CN)6]2 nanocube precursors for efficient OER application. |
