| Solid oxide fuel cell?SOFC?is an electrochemical energy conversion device that directly converts the chemical energy of fuel into electrical energy,it has the advantages of high efficiency and fuel flexibility.Anode material is an important component of SOFC.Conventional Ni-based anode materials can produce carbon deposition and sulfur poisoning when using hydrocarbon as fuels,resulting in poor SOFC performance.Therefore,it is of great significance to study and develop SOFC anode materials that resist carbon deposition and sulfur poisoning.In this paper,the Ni doping in B-site of NdBaFe2O5+?material was used to synthesize the double-perovskite anode material NdBaFe1.9Ni0.1O5+?.Based on the above results,the double-perovskite anode materials Nd1-xBaFe1.9Ni0.1O5+??x=0.02,0.04,0.06?are prepared through the introduction of Nd3+deficiency.The effect of different Nd3+-deficient contents on the properties of Nd1-xBaFe1.9Ni0.1O5+?materials was studied.It is expected that the Nd1-xBaFe1.9Ni0.1O5+?with in-situ exsolution of metallic nanoparticles in reducing atmosphere can obtain in order to improve the anodic catalytic performance,so as to improve the performance of single cell.The main research contents and conclusions of this paper are as follows:The NdBaFe1.9Ni0.1O5+?material with double perovskite structure was synthesized by sol-gel method.The results show that the double-perovskite NdBaFe1.9Ni0.1O5+?material with an orthorhombic structure can be obtained by reducing the sample in 5%H2/Ar atmosphere for 10 h at 1050°C.The compatibility test result shows that the NdBaFe1.9Ni0.1O5+?has good chemical compatibility with the common electrolytes such as SDC and LSGM.Under the 5%H2/Ar atmosphere,30-1000°C temperature range,the average thermal expansion coefficient of NdBaFe1.9Ni0.1O5+?is 16.9×10-66 K-1.At 850°C,under H2atmosphere,the polarization resistance of NdBaFe1.9Ni0.1O5+?on LSGM electrolyte is1.58?cm2.The performance of NdBaCo2/3Fe2/3Cu2/3O5+?|LSGM|SDC|NdBaFe1.9Ni0.1O5+?single cell at 850°C is 570.7 mW cm-22 with the hydrogen as fuel,when synthetic gas is used as fuel,the maximum power density reaches 450.4 mW cm-2.The Nd3+-deficient double perovskite anode materials Nd1-x-x BaFe1.9Ni0.1O5+??x=0.02,0.04,0.06?were prepared by sol-gel method.The single-phase Nd1-x-x BaFe1.9Ni0.1O5+??x=0.02,0.04,0.06?materials were obtained by sintering the samples at 1050°C in the 5%H2/Ar atmosphere for 10 h.The Nd1-x-x BaFe1.9Ni0.1O5+??x=0.02,0.06?materials have a tetragonal double-perovskite structure,and the Nd1.96BaFe1.9Ni0.1O5+??x=0.04?material is an orthorhombic double-perovskite structure.The SEM test results show that the Nd3+-deficient double perovskite with of exsolution metallic nanoparticles on its surface is observed,and size of anoparticles is 40-70 nm,suggesting that the introduction of Nd3+-deficiency was beneficial to generate the exsolution of metallic nanoparticles.In the 30-1000°C temperature range,the average thermal expansion coefficients of Nd1-x-x BaFe1.9Ni0.1O5+??x=0.02,0.04,0.06?samples at 5%H2/Ar atmosphere are 15.0×10-6,12.3×10-66 and 13.4×10-66 K-1.Under H2 atmosphere,the maximum conductivity values of the Nd1-x-x BaFe1.9Ni0.1O5+??x=0.02,0.04,0.06?samples are 22.9,10.4 and 20.8 S cm-11 at 850°C,respectively.The electrochemical impedance study shows that the polarization resistance of Nd1-x-x BaFe1.9Ni0.1O5+??x=0.02,0.04,0.06?anode on the LSGM electrolyte are 0.47,0.53 and 1.61?cm2 at 850°C under H2atmosphere,respectively.The sample with defect quantity x=0.02 has the lowest polarization impedance.The maximum power density of NdBaCo2/3Fe2/3Cu2/3O5+?|LSGM|SDC|Nd0.98BaFe1.9Ni0.1O5+?single cell is 642.2 mW cm-22 at 850°C with H2 as the fuel. |
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