Study On Preparation And Properties Of Electrocatalytic Electrode For Hydrogen Produced From Bunsen Reaction Products

With the development of society,human beings have more and more demand for energy,and in view of the depletion of fossil fuels,it has become a contemporary mission to find alternatives to fossil fuels.Hydrogen is a green sustainable energy source,and people have high hopes for it.Electrolysis of hydrogen from the Bunsen reaction product is one of the most promising ways to achieve industrial hydrogen production,but the hydrogen production of the Bunsen reaction product is inseparable from the use of a catalyst.Precious metal based catalysts are recognized as the best electrolytic catalysts in the world.However,the widespread use of such catalysts is greatly limited by the disadvantages of high cost and low reserves.Therefore,in order to reduce the cost and increase the efficiency of electrolytic HI,it is urgent to develop a non-precious metal catalyst composed of an element having a high crustal content.The amount of surface active sites of the catalyst and the intrinsic activity of the active site of the catalyst are two factors that determine the catalytic activity of the catalyst.The performance of the catalyst is closely related to its chemical element composition and surface microstructure.In this paper,a variety of high-efficiency non-precious metal electrolytic HI catalysts have been successfully synthesized by simple hydrothermal reaction on the surface of Ti substrate and Ni foam.This thesis has achieved the following research results:1.S-TiO₂ nanosheets were uniformly grown on the surface of the Ti foil by a simple hydrothermal method.Since the doping of S reduces the band gap of TiO₂,S-TiO₂/Ti exhibits excellent electrocatalytic performance in the iodine precipitation reaction.The current density of S-TiO₂/Ti can reach 100 mA/cm² at an overpotential of only 1.05 V,which is almost close to the catalytic activity of noble metal platinum.Under acidic conditions,it also has better long-term electrolytic stability than pure Ti foil.At a constant voltage electrolysis of 1.30 V,the current efficiency of the S-TiO₂/Ti composite is also close to 100%.This work has injected new impetus into the design and synthesis of inexpensive,highly efficient non-precious metal electrolytic HI catalysts.2.MoS₂ is a kind of electrolytic catalyst that is highly expected.In this paper,MoS₂catalyst is modified on the surface of Ti.Under strong acidic conditions,the composite material（MoS₂/Ti-6）with a reaction time of 6 hours exhibited high catalytic hydrogen production performance.The MoS₂/Ti-6 composite can reach a current density of 100mA/cm² at an overpotential of 302 mV.In the acidic solution,it can work at least continuously and stably for 24 h,and the hydrogen production Faraday efficiency is close to 100%.Electrochemical performance indicates that MoS₂ modification is one of the effective ways to improve the electrocatalytic hydrogen production performance of Bunsen reaction products.3.Ni-based materials have become a hot research topic due to their superior catalytic activity and good stability.In this paper,a stable hydrothermal reaction was used to grow stable Ni₃S₂ on foamed nickel.The composite material（Ni₃S₂/NF-18）with a reaction time of 18 hours has the best catalytic hydrogen production performance.The current density of Ni₃S₂/NF-18 composites during electrocatalytic hydrogen production reached 100 mA/cm²and the overpotential was only 291 mV.In the electrochemical test of composite materials,it was found to have good electrocatalytic stability,and the current efficiency was close to100%.The Ni₃S₂/NF-18 composite can be used as a highly efficient and stable electrolytic hydrogen production catalyst.