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摘要：Transition metal phosphides have been extensively studied for catalytic applications in water splitting.Herein,we report an in situ phosphorization of zeolitic imidazole frameworks(ZIF-67) to generate amorphous cobalt phosphide/ZIF-67 heterojunction on a self-supporting copper foam(CF) substrate with excellent performance for hydrogen evolution reaction(HER).The needleleaf like copper hydroxide was anchored on CF surface,which acted as implantation to grow ZIF-67.The intermediate product was phosphorized to obtain final electrocatalyst(CoP/Cu_2O@CF) with uniform particle size,exhibiting a rhombic dodecahedron structure with wrinkles on the surface.The electrochemical measurement proved that CoP/Cu_2O@CF catalyst exhibited excellent HER activity and long-term stability in 1.0 mol·L~(-1) KOH solution.The overpotential was only 62 mV with the Tafel slope of 83 mV·dec~(-1) at a current density of 10 mA·cm~(-2),with a large electrochemical active surface area.It also showed competitive performance at large current which indicated the potential application to industrial water electrolysis to produce hydrogen.First-principle calculations illustrated that benefit from the construction of CoP/ZIF-67 heterojunction,the d-band center of CoP downshifted after bonding with ZIF-67 and the Gibbs free energy(ΔG_(H*)) changed from -0.18 to -0.11 eV,confirming both decrease in overpotential and excellent HER activity.This work illustrates the efficient HER activity of CoP/Cu_2O@CF catalyst,which will act as a potential candidate for precious metal electrocatalysts.

卷号：v.17

期号：10

是否译文：否