As an energy conversion device, Direct carbon solid oxide fuel cell (DC-SOFC) can efficiently convert the chemical energy contained in carbonaceous fuels into electricity. It may be an efficient and clean way to utilize carbon fuels. In this paper, (PrBa)0.95Fe1.7Ti0.2Co0.1O6-δ (PBFTC), a perovskite oxide with A-site ordered layered structure, is successfully prepared via a sol-gel method and it has been studied as the DC-SOFC anode material. Doping of Ti and the ordered layered structure make PBFTC achieve good structural stability. The phase structure of PBFTC remained unchanged after being treated in both H2 and carbon reducing atmosphere so that it can be applied in DC-SOFC anode. Using PBFTC as the anode material, a peak power density as high as 386 mW·cm−2 is achieved at 800 °C when using pure activated carbon as fuel.
Direct carbon solid oxide fuel cells (DC-SOFCs), which can efficiently convert chemical energy of carbonaceous fuels into electricity, have recently gained much research attention as they offer an effective way to address future economic and environmental challenges. Herein, B-site Ti-substituted (PrBa) 0.95 Fe 2−x Ti x O 6−δ (PBFT x , x = 0−0.3) materials are synthesized via a sol−gel combustion method and evaluated as anode materials for DC-SOFCs. Ti doping enhances the phase structure stability of the material under a reducing atmosphere. Xray diffraction, scanning electron microscopy, and transmission electron microscopy analyses demonstrate the exsolution of metallic Fe nanoparticles on the surface of the PBFT x perovskite lattice after the materials are treated under a reducing atmosphere, which can improve the catalytic performance of DC-SOFC anode. Among the Ti-doped samples (x = 0.1−0.3), PBFT 0.2 shows the largest adsorption capacity for CO and the highest electrical conductivity in air. Using pure nano-activated carbon as a fuel, the single cell supported by La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 3 electrolyte with PBFT 0.2 as an anode achieves the maximum power densities of 527, 281, and 146 mW•cm −2 at 800, 750, and 700 °C, respectively. The above excellent performance of PBFT 0.2 indicates that it has great potential for application in DC-SOFC anode.
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