Preparation Of Ni-base Composites Coated On Ni Foam Substrate For Electrocatalytic Hydrogen Evolution

Hydrogen energy was a kind of clean energy,electrocatalytic hydrogen evolution was an important produce hydrogen method.Electrode material was one of a critical factor of electrocatalytic hydrogen evolution production.Pt was an ideal electrode material for electrocatalytic hydrogen evolution,however,Pt was limited to practical application due to its low abundance and high price.The transition metal nickel had been extensively studied as an excellent electrocatalytic material,among them,Ni₃S₂ and NiO have many advantages: for example,facile preparation process,stable chemical properties,and good electrocatalytic performance.However,there were also prone to defects such as inferior stable store electrocatalytic performance in electrocatalytic hydrogen evolution process.In this paper,Ni₃S₂/Ni composites were synthesized by one step facile of hydrothermal method,and studying the performance of electrocatalytic hydrogen evolution.To improve the electrocatalytic hydrogen evolution performance of the Ni₃S₂/Ni composites,graphene was added to the composites.In addition,The NiO/Ni composites were synthesized by one step facile of hydrocarbonylation method,and also studying the performance of electrocatalytic hydrogen evolution.The main research contents were showing as follows:1.The Ni₃S₂/Ni composites were synthesized by one step of hydrothermal method using Ni foam and thiourea as raw materials.The composite materials exhibited a good performance of electrocatalytic hydrogen production and stability,it had a low overpotential of 279 mV and a tafel slope of 190mV/dec at a current density of 10mA/cm².2.The Ni₃S₂-GE/Ni composites were synthesized by one step of hydrothermal method using Ni foam,graphite oxide and thiourea as raw materials.The composite materials had a good performance of electrocatalytic hydrogen production and stability,it had a overpotential of 110 mV and a tafel slope of 170mV/dec at a current density of 10mA/cm².3.The NiO/Ni composite materials were synthesized by one step of oxidation method using Ni foam and potassium peroxydisulfate potassium persulfate as raw materials.The composite materials demonstrated a good performance of electrocatalytic hydrogen production and stability,it had a overpotential of 135 mV and a tafel slope of 182mV/dec at a current density of 10mA/cm².