| 초록 |
Here, we present a bifunctional hybrid electrocatalyst consisting of Co9S8 and MoS2 each performaing as OER and HER active material with structural metris of hierarchical morphology, huge electrocatalytic active sites and enhanced charge transfer ability. The structural features were derived from metal organic framework precursor and elaborately controlled by the calcination temperature dependent-Kirkendall diffusion effect. Specifically, the imbalance in diffusion rates between Co and S confined in the carbon frame triggered outward growth of Co9S8 species while suppressing bulk growth of MoS2 at outer surface. As a result, the hybrid electrocatalyst exhibits low overpotential of 126 mV for HER and 233 mV for OER to generate current density of 10 mA cm-2, resepctively. |
