Preparation Of Titanium-Based Oxygen Evolution Anode Materials And Its Application

With the development of economy,protecting the ecological environment has become a consensus of mankind.Chromium trioxide is an indispensable resource in the national economy,at present,the main production method of chromic anhydride at home and abroad is?sulfuric acid acidification method?,and the problems of serious pollution,low resource utilization rate and low product quality have been highly attention of the government.Electrochemical synthesis technology is being used for preparation of chromium trioxide due to its unique advantages.As an important part of the electrocatalytic process,the electrode is the key to the entire electrocatalytic process,which not only affects the ra te of electrochemical reaction and conversion rate,but also directly affects the production cost of the enterprise.?1??NiFe-LDH/RGO-PPy?composite was prepared by solvothermal method.And the composite was analyzed by XRD,TEM,XPS and other analytical methods.The electrochemical performance of NiFe-LDH/RGO-PPy was measure by cyclic voltammetry,linear voltammetry,et al.The results show that the NiFe-LDH/RGO-PPy composite shows excellent electrocatalytic activity,such as lower oxygen evolution overpotential?210 mV vs.Hg/HgO?,lower Tafel slope(38 mV·decade^-1)and better electrochemical stability in oxygen evolution reaction.?2?NiFe-LDH/RGO-PPy coating titanium anode with IrO₂ interlayer was prepared by thermal decomposition method,and it was used in electrocatalytic synthesis of sodium dichromate in self-made cell.The process parameters such as cell voltage,current efficiency and conversion of the quaternary coating titanium anode used in electrocatalytic synthesis of sodium dichromate were investigated.The results show that the coating titanium anode has a cell voltage of about 3.2 V,an average current efficiency of 94.50%,an average conversion of 95.01%,and direct current consumption of about 609.23 kW·h·t^-1 in the electrocatalytic synthesis of sodium dichromate,which is better than the traditional coating titanium anode.?3?Ir-Ta-Ti-Nb/Ti quaternary coating titanium anode with IrO₂ interlayer was prepared by thermal decomposition,which was used in electrocatalytic synthesis of chromium trioxide,and the process parameters such as cell voltage,current efficiency and conversion of the quaternary coating titanium anode used in electrocatalytic synthesis of chromium trioxide were investigated.The phase structures and surface morphology of titanium anode coating before and after electrolysis were analyzed.The results show that the Ir-Ta-Ti-Nb quaternary composite coated titanium anode with intermediate coating IrO₂ was prepared by thermal decomposition.The coating titanium anode has a cell voltage of about 6.6 V and direct current consumption of about 1926.21 kW·h·t^-1 in the electrocatalytic synthesis of chromium trioxide,which is better than the traditional coating tita nium anode.The composition and surface morphology of the coatings did not change before and after electrocatalysis.The two composite coating titanium anode materials investigated in this paper and their applications in electrocatalytic synthesis of chromic anhydride not only provide new ideas for those problems,such as expensive coatings,rare reserves,but also provide theoretical support for the green clean production of electrocatalytic synthesis of chromic anhydride Moreover,it has far-reaching significance for the current progress of the entire electrolysis industry and the promotion of ecological civilization.