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High-activity electrocatalysts play a crucial role in energy conversion through splitting water to produce hydrogen.Here we fabricate a C60(OH)n/CoP-codecorated CoP Nanosheet which acts as an electrocatalyst for hydrogen evolution reaction(HER).Structure and morphology characterizations reveal that the CoP nanoparticles are uniformly anchored on the CoP nanosheet as a quantum-dot form with a diameter of ca.5 nm.Furthermore,C60(OH)n/CoP-codecorated CoP nanosheet presents a ultra-high electrocatalytic activity with a current density of 10 mA cm-2 at the applied overpotential of 88 mV in 0.5 M H2SO4 and 124 mV in 1 M KOH,respectively.The electrochemical impedance spectroscopy confirms that C60(OH)n/CoP-codecorated CoP Nanosheet possesses faster charge-transfer kinetics and h