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A new class of Co9S8@MoS2 core–shell structures formed on carbon nanofibers composed of cubic Co9S8 as cores and layered MoS2 as shells is described. The core–shell design of these nanostructures allows the advantages of MoS2 and Co9S8 to be combined, serving as a bifunctional electrocatalyst for H2 and O2 evolution.
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