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C 60 -Decorated nickel-cobalt phosphide as an efficient and robust electrocatalyst for hydrogen evolution reaction.
Nanoscale 2018 December 5
High-activity electrocatalysts play a crucial role in energy conversion through splitting water to produce hydrogen. Here we report the synthesis of a bimetallic phosphide of Ni-Co-P coupled with C60 molecules which acts as an electrocatalyst for the hydrogen evolution reaction (HER). Powder X-ray diffraction (XRD) and transmission electron microscopy (TEM) characterization reveals that the synthesized C60-decorated Ni-Co-P nanoparticles have an average diameter of ∼4 nm with rich structural defects. Electrochemical tests show that the as-synthesized C60-decorated Ni-Co-P catalyst with a C60-content of 3.93 wt% presents a low onset overpotential of 23.8 mV, a small Tafel slope value of 48 mV dec-1, and excellent hydrogen-evolution stability with a slight increase of its η10 from 97 mV to 102 mV after 500 cycles. Additionally, electrochemical impedance spectroscopy (EIS) confirms that the C60-decorated Ni-Co-P electrode possesses faster charge-transfer kinetics and hydrogen-adsorption kinetics than the C60-free Ni-Co-P electrode during the HER process. The synthesis of a C60-decorated composite is feasible and the composite can be used as an efficient and robust Pt-free catalyst.
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