Enhanced Electrolysis Of Modified Nickel-based Anode Catalyst System For Hydrogen Production By Reduction Of Urea

In recent years,with the continuous rapid development of the social economy,energyissue have become more and more prominent.However,the non-renewability and lack of fossil energy cannot meet the needs of social development.Therefore,the development of novel energy has become a common concern of the whole society.Hydrogen is one of the most ideal future energy sources due to its cleanliness and high energy density.The development of hydrogen can be one of the main ways to solve global energy problems.Hydrogen production from electrolyzed water is a relatively mature technology for the preparation of high-purity hydrogen.However,the electrolysis system requires a higher potential for anodization and a higher energy loss.Therefore,it is necessary to replace the reduction of anodization.Agents have become the main method to solve this problem.Urea,as a pollutant,can cause pollution to the atmosphere,water and soil,but urea has superior reducing performance.In the electrochemical system,urea is oxidized to N₂ and CO₂,which is harmless to the environment,and the hydrogen content of urea itself is higher.High,therefore,urea is an ideal auxiliary hydrogen production reducing agent.In this paper,urea is used as a reducing agent,a nickel-based electro-oxidation catalyst is used as an anode,and a graphite electrode is used as a cathode to construct a urea electro-oxidation system.The anode catalyst of the modified nickel-foam substrate is used to promote the oxidation of the anode urea and promote the cathode hydrogen evolution reaction.Provide new ideas for the treatment of urea wastewater and the development of hydrogen energy.In this paper,the electrodes were modified by Co and Co,Co,Zn and S by hydrothermal method.The materials were characterized by material characterization and electrochemical characterization.These elements were successfully loaded onto the surface of foamed nickel and the current density was 20 mA cm^-2.The Ni-Co electrode requires only 0.4V vs SCE potential.The Ni-Co electrode only needs 0.25V vs SCE,which is much lower than the foamed nickel,and the Ni-Co electrode degrades0.33mol/L of urea in the electrochemical reactor used in this experiment at a voltage of3.5V.The Ni-Co electrode only needs a voltage of 3V,indicating that the modification of the electrode by the transition metal oxide and the binary metal sulfide makes the electrode performance greatly improved.It provides a new idea for the treatment of urea wastewater and the preparation of hydrogen.