Kirkendall effect induced bifunctional hybrid electrocatalysts for high performance overall water splitting
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초록
내용
Here, we presented a bifunctional hybrid electrocatalyst consisting of Co9S8 and MoS2 each performing as OER and HER active material with structural merits 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, which facilitates effective accessibility of electrolyte.