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    					In situ growth of phosphorized ZIF-67-derived amorphous CoP/Cu2O@CF electrocatalyst for efficient hydrogen evolution reaction  | 
  					 
  					  										
						Ruiwen Qi, Xiao Liu, Hongkai Bu, Xueqing Niu, Xiaoyang Ji, Junwei Ma( ), Hongtao Gao( ) | 
					 
															
						| Key Laboratory of Optic-Electric Sensing and Analytical Chemistry for Life Sciences, MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China | 
					 
										
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													     		                            						                            																	    Abstract  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 needle-leaf 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/Cu2O@CF) with uniform particle size, exhibiting a rhombic dodecahedron structure with wrinkles on the surface. The electrochemical measurement proved that CoP/Cu2O@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 (ΔGH*) 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/Cu2O@CF catalyst, which will act as a potential candidate for precious metal electrocatalysts. 
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															| Keywords 
																																																				CoP/Cu2O@CF  
																		  																																				electrocatalyst  
																		  																																				phosphorization  
																		  																																				HER  
																		  																																				DFT  
																																			  
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																																Corresponding Author(s):
																Junwei Ma,Hongtao Gao   
																													     		
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																															Just Accepted Date: 15 May 2023  
																																														Online First Date: 30 June 2023   
																																														Issue Date: 07 October 2023
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