Preparation And Characterization Of CoSn?CoFe And NiFe Bimetallic Compound For Electrocatalytic Oxygen Evolution Reaction

In the long run,non-renewable fossil fuels such as oil,coal and natural gas are not effective solutions to energy shortages and their associated problems.To completely solve the environmental problems associated with fossil fuels,such as air pollution and global warming,we must gradually replace fossil fuels with clean energy.Hydrogen from wind,solar or nuclear energy is one of the most effective ways to avoid using fossil fuels.Due to the large reservation of water on the earth,the splitting of water for hydrogen production has become a hot area of current research.Water splitting includes two main reactions,hydrogen evolution reaction?HER?and oxygen evolution reaction?OER?,but the main bottleneck problem of water splitting is mainly the oxygen evolution reaction?OER?.RuO₂ and IrO₂ are the state-of-art catalysts for the oxygen evolution reaction?OER?,but RuO₂ and IrO₂ are rare and expensive noble metal-based materials.Therefore,the researchers have been committed to the development of low-cost and efficient electrocatalysts.The bimetallic compounds?BCs?catalyst is a common anode catalyst.The modification of the active metal with the second metal is a very effective method.The resulting bimetallic compounds have enhanced OER activity due to uniform atomic dispersion.In addition,the electronic effect and synergistic effect of bimetallic compounds can also enhance the catalytic activity.In this paper,Co-Fe,Ni-Fe,Co-Sn bimetallic compounds were prepared by the introduction of tin and iron,and the oxygen evolution properties of bimetallic compounds were explored.Different proportions of Co-Sn bimetallic compounds were prepared by solvothermal method.The physicochemical properties of the materials were characterized by XRD,ICP,SEM,XPS and TEM.The oxygen evolution reaction?OER?electrochemical performance of materials was also investigated.It was found that the oxygen evolution performance of the CoSn bimetallic compound with the ratio of 1:1 was the best.The introduced Sn element may be responsible for the lower overpotential and Tafel slope of CoSn in 1.0 M KOH solution due to the electron effect that can help increase the conductivity of the catalyst.In addition,CoSn shows the best stability because there is no significant loss of active site on the catalyst surface after 10 h.Lower overpotential and Tafel slope and better stability make it a promising electrocatalyst for OER.Different proportions of Co Fe and NiFe bimetallic compounds were prepared by coprecipitation method.The physicochemical properties of the materials were characterized by XRD,ICP,XPS and TEM.The oxygen evolution reaction?OER?electrochemical performance of materials was also investigated.It has been found that CoFe and NiFe bimetallics have no Oxygen Evolution Reaction performance advantage over RuO₂.By XPS and TEM characterization,It was found that the surface of the catalyst particles had been oxidized.CoFe and NiFe bimetallic compounds had serious particle agglomeration,the above reasons cause CoFe and NiFe bimetallic compounds oxygen evolution performance much lower than IrO₂ and RuO₂.