Fabrication and characterization of planar-type SOFC unit cells using the tape-casting/lamination/co-firing method

Corn-cob like nanofibres as cathode catalysts for an effective microstructure design in solid oxide fuel cells

“…This enhanced outcome was highly improved compare to our previous works and the tested performance of the commercial LSM-YSZ cathode with around 0.98 Wcm -2 . 12,20 Moreover, this achievement was even higher compare to the electrode by the opposite configuration of LSM and YSZ with the maximum power density of 0.91 Wcm -2 at a current density of 1.79 Acm -2 . It was found that the trend of the maximum power densities and resistances were consistent with the half-cell data for the corn-cob fibers and commercial cathode, as we discussed before ( Figure 5).…”

“…Two depressed arcs were observed at the tested temperature of 800 o C. The total resistance for the nanofiber with LSM shell and YSZ core was smaller than the upside one with the value of 0.309 Ω (vs. 0.359 Ω), which is much smaller than of other previous works. 12,20 Generally, the first arc (1) can be assigned to the charge transfer process and the second arc (2) provides an information about the dissociation of oxygen molecules and adsorption of oxygen gas into the cathode. 21,27,[38][39] Based on the same material compositions, there was no big difference in the intrinsic property of the cathode.…”

“…Higher performance based on the same cell composition may come from the better ORR activity, which is normally taken place at the TPB interface of oxygen gas, LSM and YSZ with the order of reactant transfer, catalytic reaction and charge transfer. [20][21][22][23][24][32][33][34] From this mechanism, it is clear for YSZ@LSM nanofibrous cathode that the improved microstructure provides oxygen adsorbed easily to the LSM. Furthermore, more number of active sites could be formed for LSM positioned at outside to catalytically react.…”

“…As the cathode reaction only take place at the three-phase boundary (TPB) sites where LSM-YSZ-gas phase meeting together, the microstructure design is an important process to increase the TPB sites from larger active sites and better connectivity for optimizing the cathode electrochemical reaction. [13][14][15] Many efforts have been made to optimize the microstructure of the cathode in order to gain an satisfied polarization resistance by changing various mixed ion/electron conductors, [16][17] production methods (infiltration, impregnation), [18][19][20] preparation conditions (temperature, time , etc), 21 and material morphology (particle size and shape).…”

Synthesis of LSM–YSZ–GDC dual composite SOFC cathodes for high-performance power-generation systems

“…The other possible reason is that the formation of the secondary phase reaction between LSM and YSZ mostly occurs at high temperature [13][14][15][16]. According to previous research findings the secondary phase of La 2 Zr 2 O 7 and SrZrO 3 , which has a large negative effect on the cathodic performance, occurs at 1400°C [29]. The structure change of LSM phases within the LSM/GDC-YSZ particles was analyzed by according to the cathode firing temperature because the temperature when the secondary phases are formed could be lowered due to the high activity of nano-sized particles.…”