Study On The Properties Of Controllable Preparation And Derivatives Of One-Dimensional Composite Nano-Electrocatalytic Materials In Electrolytic Water Oxidation

With the increasing energy demand of mankind,electrolyzed Water splitting,as a green sustainable technology,is one of the most promising ways to achieve efficient energy conversion.As one of the semi-reactions of electrolyzed water technology,the oxygen evolution reaction?OER?involves complex multi-proton coupling and multi-electron transfer processes,resulting in slow oxygen evolution kinetics and thermodynamic processes,limiting the occurrence of this reaction,and requiring higher overpotentials to accelerate the reaction proceeds.Therefore,the preparation of high activity,low reaction overpotential OER catalysts is a key step in improving the efficiency of the overall hydrolysis technology.Due to the unique advantages of high specific surface area,high aspect ratio and high electrical conductivity,the one-dimensional nanowires use its high uniform uniformity as a template material to construct multi-dimensional materials on its surface?such as two-dimensional materials such as LDH?.Through fine component regulation,structural design,element doping allows it to fully expose more effective active sites.In this paper,based on the above considerations,we designed a material for the formation of high active sites exposed on the one-dimensional material and controlled by the effective components for efficient oxygen evolution reaction and urea oxidation reaction.The main research contents are as follows:1.A layered nickel-iron hydrotalcite nano-array?Ni Fe-LDH/Ag?was designed based on silver nanowires?Ag NWs?,and Ni Fe-O/Ag with uniform structure was prepared by one-step calcination of Ni Fe-LDH/Ag.Both TEM and XPS results indicated the presence of metallic Ag and Ni Fe-O heterointerfaces on Ni Fe-O/Ag.As revealed by electrochemical results,the above heterointerfaces could not only promote the charge transfer during OER but also optimize the electronic state of Ni Fe-oxides,thereby markedly enhancing the activity for OER.Besides,the hierarchical architecture of Ni Fe-O/Ag arrays can also enhance the activity for OER by exposing more active sites for OER.Benefiting the advantageous architecture and unique heterointerfaces,the Ni Fe-O/Ag arrays display outstanding performance for OER,such as a small overpotential 265 m V to achieve current density of 10 m A cm-2,a small Tafel slope of 47 m V dec-1,and a strong stability of 30 h,superior than most of non-precious metal electrocatalysts.2.The CoCo-PBAs were uniformly grown on the surface of Cu NWs by uniform coprecipitation,and the obtained product was CoCo-PBAs/Cu-NWs.Then,a P-doped Co O-Cu₂O/Cu-NTs nanotube containing interconnected nanoparticles was prepared by a simple two-step calcination route.A three-dimensional?3D?accessible surface is created.The 3D opened surface could favor both the active sites exposure and electrolyte transport for efficient electrocatalysis.further,as demonstrate by both of electrochemical tests and the oretic calculations,the P-doping was found to be an efficient way for optimizing the electronic structures of Co O,Thus enhancing the conductivity and promoting the in-situ formation of active Co OOH species during oxygen evolution reaction?OER?.results,the P-Co O-Cu₂O/Cu-NTs displayed excellent performance for OER and urea oxidation reaction?UOR?with overpotential of 261 and 203 m V at 10 m A cm-2,respectively,outperforming most non-precious metal electrocatalysts and precious Ru O2.Thus,the P-Co O-Cu₂O/Cu-NTs was a promising candidate instead of precious electrocatalysts for efficient OER and UOR.