Preparation Of Co-Ni Based Phosphates And Study On The Performance Of Electrocatalytic Oxygen Evolution

Electrolysis of water to hydrogen is an important strategic measure to realize the large-scale development and application of hydrogen energy.Oxygen evolution in water oxidation reactions is the core reaction for all these systems to undergo reversible processes.Among them,oxygen evolution reaction mainly involves the process of 4 electron transfer and the formation of O=O bond,which is a complex and slow dynamic process,seriously hindering the progress of water decomposition.Therefore,the development of a catalyst with high catalytic activity and low potential is the main way to solve this problem.At present,the most commonly used catalysts are the oxides or alloys of the precious metals ruthenium?Ru?and iridium?Ir?.However,the low reserves and high prices of precious metals in nature seriously restrict the large-scale production of hydrogen.Therefore,the key to solve this problem is to design and develop non-noble metal catalysts with low cost,high efficiency.In this paper,nickel,cobalt based materials with low price,high activity and strong stability are selected as the focus of anode catalyst research.?1?Monometallic hydroxides were prepared by hydrothermal method,and it was found that nitrates of Ni and Co could easily be assembled into two-dimensional nanometer tablets under hydrothermal conditions,with a certain OER catalytic performance.?2?NiCo bimetal layered hydroxide?Ni Co-LDH?precursor was prepared on the nickel foam.After phosphating treatment,Ni Co bimetal phosphates were prepared and used as OER working electrodes under alkaline conditions.The effect of different metal proportions on THE OER performance of Ni Co bimetal phosphates is also studied.?3?When it reaches the current density of 10 m A·cm^-2and 1T-Mo S₂prepared by hydrothermal synthesis method,the overpotential is 250 m V;Using Ni Co P as the anode and1T-Mo S₂as the cathode,a two-electrode fully decomposed water reaction system was coupled to construct.Under the applied voltage of 1.78V,the current density reached 10.3m A·cm^-2.