The Preparation And Electrolytic Hydrogen Evolution Performance Study Of Nano TiO₂-Ti Based Composite Cathode

Nowadays,with the emergency problem of energy consumption and environmental pollution,excavation and utilization of renewable energy arise great interest.So far,the best way to acquire hydrogen is electrocatalytic hydrogen evolution,cathode electrocatalysts are the key.Therefore the research on the common precious metal materials and supported materials is increasingly hot.However,carbon carrier is commonly used as it can be easily eroded in acidic and alkaline mediums,it is necessary to develop better cathode catalyst carriers.The important contents of this paper are included as follows:1.In order to improve the hydrogen evolution performance of electrolyzed water,the amorphous nickel phosphide was grown directly on the TiO2 nanotube arrays by cyclic voltammetry deposition.And the electrocatalytic hydrogen evolution performance was tested in 0.5 mol/L sulfuric acid solution.When the cycle number was at 50 times,the tafel slope was about 73 m V/dec,the hybrid electrodes generated cathodic currents of 10 m A/cm2 and 100 m A/cm2 at overpotentials of 146 m V and 276 m V,respectively.After that,the relationships between the electrodeposition parameters,morphology and performance of the catalyst were explored.2.To develop nanostructured TiO2 with better conductivity and electrocatalytic performance,TiO2 hollow nanorods(TiO2 HNRs)and TiO2 nanotubes(TiO2 NTs)were synthesized based on titanium plates by zinc oxide template method and anodic oxidation method,respectively.Thereafter,the electrocatalytic performances of these two nano TiO2 with different structures for hydrogen evolution reaction were evaluated in 0.5 mol/L sulfuric acid solution by electrochemical methods,compared with pristine titanium plate.The results showed that TiO2 HNRs had the lower overpotential for hydrogen evolution reaction.Meanwhile,TiO2 HNRs with a lower Tafel slope value was more conducive for the electrocatalytic reaction.The better electronic conductivity of TiO2 HNRs was confirmed by the electrochemical impedance spectroscopy(EIS).Therefore,compared with the TiO2 NTs and titanium plate,TiO2 HNRs had a best electrocatalytic performance for hydrogen evolution reaction.