| 초록 |
We fabricated three-dimensional NiCo-N-C bi-functional catalysts with a hierarchical structure for overall water splitting at high current density. Nickel and cobalt hydroxide nanosheets were firstly grown on carbon cloth substrate, followed by the subsequent reaction to NiCo-MOF by immersing into 2-methylimidazole solution. During this conversion process, one-dimensional (1D) bimetallic-imidazolate complexes were grown onto the surface of NiCe nanosheets to filling the matrix between micrometer-size 2D nanosheets. Finally, NiCo-MOF were annealed with melamine powder under argon flow at 800 oC, and melamine-assisted growth of tiny carbon nanotubes (CNTs) were observed, exhibiting 3D carbon matrix of bulk electrodes. The 3D metal-nitrogen-carbon (M-N-C) electrodes were directly applied to alkaline water electrolyzer, used as the catalytic electrodes toward both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) simultaneously. |
