原位双金属纳米颗粒YST复合阳极的构筑及其直接碳催化性能研究

In this paper, the structure and performance of in-situ Cu precipitation and CuCo bimetallic precipitation of yttrium-doped strontium titanate (YST) materials as direct carbon fuel cell (DC-SOFCs) anodes were studied. A series of Co doped Y_0.08Sr_0.92Ti_0.9-xCu_0.1Co_xO_3-δ (x = 0, 0.1, 0.2, 0.3) anode materials are prepared by combustion method. XRD, SEM and TEM techniques are used to study the anode materials' microstructure. When Co doping content reaches to 0.2, the CuCo bimetal nanoparticles are uniformly precipitated on anode after hydrogen reduction. The conductivity test shows that CuCo bimetallic nanoparticles can effectively improve the conductivity of the material. The impedance test in CO atmosphere showed that the smallest polarization impedance is obtained for Co0.2 anode material with precipitated CuCo bimetallic nanoparticles, and its catalytic activity is better than that of other samples. Then, the cell using Y_0.08Sr_0.92Ti_0.7Cu_0.1Co_0.2 material as the anode exhibits good stability and excellent electrochemical performance at 800℃, with a maximum power density of 591 mW•cm^-2. It is shown that the Y_0.08Sr_0.92Ti_0.7Cu_0.1Co_0.2 is an excellent DC-SOFC anode material.