Study Of Metal Catalyst Preparation On Ceramic Electrode Surface And Electrochemical Process Of High Temperature Electrolysis

Renewable energy has been paid a lot of attention in the research which provides a promising way to solve the energy crisis. Solid oxide electrolyzer is a novel and efficient device which can produce clean energy, such as hydrogen, carbon monoxide and so forth. In this study, the performance of the cathode composed with active metal has been investigated for the utilization in the cathode of the solid oxide electrolyzer.This study has investigated the Ni impregnated La0.75Sr0.5Cr0.5Mn0.5O3-δ (LSCM) porous electrode for high temperature steam electrolysis. The cathode materials are reduced by 5%H2/Ar at high temperature to form the Ni-LSCM composite cathode. The solid oxide electrolyzers with cathodes based Ni-LSCM show improved polarization resistance and voltage-current curves imply the higher current density, in addition, Faraday efficiencies are enhanced by approximate 20% in contrast to the bare LSCM in carbon dioxide at 800 ℃. For further confirming the improvement of the nano-metal ceramic composite electrode, perovskite vanadate Lao.7Sro.3VO3-δ (LSV) is employed as the ceramic cathode for performance tests of polarization and catalytic property for steam electrolysis in which the nano-metal Ni and Fe are impregnated into the cathode of the solid oxide electrolyzer.In-situ growth of the active nano-metal from the ceramic substrates can benefit the anchorage of the metal and ceramics. (Lao.75Sro.25)(Cro.5Feo.5)03-δ (LSCrF) has been employed as substrate and A-site deficient, B-site excess (Lao.75Sro.25)o.85(Cro.5Feo.5)o.85Feo.1503-δ(LSCrFF) is designed which is reduced to grow the Fe nano-metal catalyst on the surface of the ceramics. The material is used for the cathode material of the solid oxide electrolyzer which is operated to electrolysis the steam. It is found that the polarization resistance is largely reduced; furthermore, the Faraday efficiency is enhanced by approximate 20%. For further confirmation of the research above, the (Lao.2Sro.8)(Tio.9Mno.1)03-δ (LSTM) is utilized as the substrate and (La0.2Sr0.8)0.9(Ti0.9Mn0.1)0.9Ni0.1O3-δ(LSTMN) is designed which is employed in the application of the cathode materials for high temperature carbon dioxide electrolysis.