Preparation Of Cu/Ni-LSCM Anode And Its Methane Dry Reforming Performance

Solid oxide fuel cell(SOFC)is an all-solid-state device that directly converts chemical energy in fuel and oxidant into electrical energy.It is a promising energy conversion technology with low emission,high energy conversion efficiency and flexible application.In order to ensure good catalytic performance at the anode-electrolyte boundary,it is good technical route to use a porous anode material Cu/Ni-LSCM and a high-conductivity electrolyte La_0.9Sr_0.1Ga_0.8Mg_0.2O_3-?(LSGM)to make a half-cell.In this work,La_0.7Sr_0.3Cr_0.5Mn_0.5O_3-?(LSCM)anode powder and Cu/Ni-LSCM composite anode material prepared by impregnation method were studied.The effects of impregnation times and Ni/Cu atomic mass ratio on the properties of anode materials were discussed.Use X-ray diffraction analysis(XRD),field emission scanning electron microscope(FE-SEM),energy spectrum analysis(EDS),programmed temperature reduction(H₂-TPR),specific surface area(BET),porosity test(PT),conductance The test methods such as rate test(CT)and alternating current impedance test(EIS)characterize and analyze the performance of anode materials.The research results are as follows.La_0.7Sr_0.3Cr_0.5Mn_0.5O_3-?anode powder was synthesized by the glycine-nitrate process(GNP,Glycine-Nitrate Process).The experimental results show that the synthesized LSCM meets the structure expected before the experiment,that is,the perovskite structure.The specific surface area of the LSCM synthesized by the glycine-nitrate method is relatively larger than that of the LSCM synthesized by the solid-phase method.Cu O/Ni O-LSCM composite anode support sheets and Cu O/Ni O-LSCM powders with Ni and Cu atomic mass ratios of 3:1 to 6:1 were prepared by the impregnation method,and have good electrical conductivity and catalytic activity.Using 8wt%starch as a pore-forming agent,under the pressure of 10 MPa,the LSCM anode support sheet obtained by the tableting mechanism has a large specific surface area and a good microstructure.Four different mass ratios of Ni and Cu atoms were studied.The morphology of Cu/Ni-LSCM immersed three times and the particle size distribution of the surface Cu-Ni alloy.LSGM was prepared by solid-phase method.LSGM was continuously sintered at 1450?for 15hours in air atmosphere.LSGM-based LSCM anode functional layer and LSGM electrolyte layer were prepared by screen printing.The size of the screen mesh has a certain effect on the morphology of the film layer.Compared with 200 and 250 mesh,the film printed under 300mesh is denser and the effect is better.The anode of LSGM-based LSCM was sintered at 1200?and 1300?for 2h respectively.SEM results showed that 1200?sintering for 2h was a good condition for the preparation of LSGM anode film.Finally,Cu O/Ni O-LSCM/LSGM-LSCM/LSGM half-cells were successfully prepared.The catalytic efficiency of Cu O/Ni O-LSCM powders impregnated three times with Ni and Cu atomic mass ratios of 3:1 to 6:1 for 600/700?was studied.The BET characterization results show that the specific surface area of Cu O/Ni O-LSCM before and after reduction under 650?H₂atmosphere is the highest under the condition of 5:1,which are 18.373m₂/g,10.797m₂/g,and the specific surface area after reduction will somewhat decrease.Cu/Ni-LSCM is catalyzed continuously at 600/700?for 4h,compared with 700?,the methane conversion rate at 600?is significantly lower,with the maximum values of 69.10%and 89.00%,respectively.The continuous catalysis experiment was selected at 700?for a longer period of time.The catalyst was continuously catalyzed at 700?for 16 hours.No catalyst deactivation was observed during the catalysis.The highest conversion rate is 88.56%.