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Water electrolysis has been regarded as a promising technology to produce clean hydrogen fuel with high purity.However,large-scale water electrolysis has been greatly hindered due to the lack of non-noble metal catalysts with high catalytic performance.Benefitting from unique hollow structures with large surface area and adjustable chemical compositions,hollow design plays an important role in improving the electrocatalytic perfor-mance for hydrogen evolution reaction(HER).Herein,we report an effective multi-step strategy to prepare hierar-chical Co-decorated Mo2C hollow spheres(CMCHSs)as electrocatalyst for HER.To be specific,the preparation process involves a metal-chelated polymerization and a subsequent surface modulation process.Owing to the unique hollow structure and incorporation of Co species,the as-prepared CMCHSs demonstrate largely enhanced HER performance with a low overpotential of 139 mV at the current density of 10 mA·cm-2 and good cycling durability in acid.The present research work highlights a new feasible strategy for the design of HER electrocatalyst via hollow designs and surface engineering.