| 초록 |
In this study, we prepared a bifunctional hybrid electrocatalyst consisting of MoS2 and Co9S8 each performing as HER and OER active materials with structural merits of hierarchical morphology, huge electrocatalytic active sites and enhanced charge transfer ability. The structural features were derived from metal organic framewokr 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, which facilitates effective accessibility of the electrolyte. As a result, the as-prepared hybrid electrocatalyst exhibits low overpotential of 126 mV for HER and 233 mV for OER to generate current density of 10 mA cm-2, respectively. |
