Catalytic System On The Surface And Interface Of Ceramic Electrode And Its Performance For High Temperature Electrolysis Carbon Dioxide Application

Solid oxide electrolyzer cell(SOEC)is a way to utilize solar energy,wind energy,tidal energy and other clean energy to generate electricity and realize carbon dioxide or water vapor in high temperature electrolysis for clean energy hydrogen or carbon monoxide electrochemical device,which can alleviate the energy crisis,but also can reduce the environmental problems.This paper mainly aimed to solve one of the key issues that traditional Ni cermet electrodes tend to be oxidized when being utilized as cathode materials for electrolyz cells.By controlling perovskite titanate cathode materials,the electrochemical process of high temperature electrolysis of carbon dioxide was studied.The principle,classification and key materials of solid oxide were introduced in this paper,and the research status of polarization loss and carbon dioxide electrolysis in electrolytic cell was briefly described.In this paper,a cathode material with catalytic activity of scandium as carbon dioxide electrolysis was studied on the(La,Sr)TiO3+? substrate with good oxidation and reduction stability.The conductivity of the reduced electrode decreased with the increase of the content of scandium at 800?,but the ionic conductivity increased gradually.The impedance spectrum of the symmetrical cell with different hydrogen partial pressure showed that the increase of scandium was beneficial to reduce the loss of polarization of the battery.The cathode material doped with scandium regulated oxygen vacancy concentration and reduced oxygen migration barrier.The current efficiency ofCO2 electrolysis with scandium doped cathode was higher than that of(La,Sr)TiO3+? cathode material adout 30%at 800 ?.Secondly,in the electrolytic cell cathode material,the B site of titanate matrix was doped with redox Mn((La,Sr)(Ti,Mn)O3+?),and then in-situ growth of nickel nano catalyst to improve the performance of carbon dioxide electrolysis.The in situ precipitation of nickel nanoparticles was characterized by X ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM)and photoelectron spectroscopy(XPS).The results of carbon dioxide electrolysis showed that Mn doped cathode material had better electrolytic performance than titanate electrode,due to the improved ionic conductivity and oxygen vacancy concentration by Mn.Moreover,with the increase of nickel content,the performance of carbon dioxide electrolysis increased.When the nickel content was 10mol%at 1.8V applied voltage,the current density reached 1.15A·cm-2,indicating that in situ grown nickel catalyst increased the catalytic activity site and improved the electrocatalytic performance of carbon dioxide.Finally,the NiyCui-y alloy catalyst was reversibly grown on the surface of ceramic electrode material((La,Sr)(Ti,Mn)O3+?),based on the synergistic effect of Ni metal catalytic activity and Cu metal CO transformation selectivity,regulating the catalytic performance of ceramic electrode for catalytic cracking.In addition to using XRD?SEM?TEM?XPS?TGA to describe the in situ growth of NiyCu1-y alloy nano particles,we also investigated the ionic conductivity of the studied electrode materials and carbon dioxide adsorption in physical and chemical forms.The results of carbon dioxide electrolysis showed that(La0.2Sr0.8)0.85Ti0.8Mn0.1(Ni0.5Cu0.5)0.1O3+?cathode material had the best electrolytic performance,and its current efficiency at 800? was close to 100%with an applied voltage of 1.6V.