Wang Xintao,Zhong Jianyi,Li Zhanggui,Xiang Jiali,Hou Bingxue,Tan Zanxiong,Liu Lisha,Wang Cheng Cheng
The development of high-performance and chromium-tolerant stable hierarchical cathodes is crucial for practical applications of solid oxide fuel cells (SOFCs). This work presents a synergistic strategy to manufacture hierarchical cathodes, focusing on optimizing microstructural and electrochemical properties. By integrating advanced fabrication techniques, including nanostructuring and surface engineering, we achieved a significant enhancement in high entropy double perovskite cathode. The electrochemical activities and chromium tolerance of BaO impregnated on (La 0.2 Pr 0.2 Sm 0.2 Gd 0.2 Nd 0.2 )Ba 0.5 Sr 0.5 Co 1.5 Fe 0.5 O 5 (LPSGNBSCF) high-entropy double perovskite cathodes in SOFCs were investigated in this study. Here, an optimum coated amount of BaO-LPSGNBSCF-0.15 mol/L electrode exhibited smaller electrode polarization resistance ( R p ) of 0.22 Ω cm 2 than pure LPSGNBSCF electrode with R p of 0.5 Ω cm 2 operating at 800 °C in the presence of Cr 2 O 3 for 100 h. The synergistic catalyst coating of BaO-LPSGNBSCF-0.15 M could lead to less Cr deposition and SrCrO 4 formation on LPSGNBSCF after exposure to Cr 2 O 3 . Moreover, the cell delivered the maximum power density of 985.9 mW/cm 2 at 800 °C, higher than 803.1 mW/cm 2 of bare LPSGNBSCF single cell and showed good stability with 100 h in short-term test. This work elucidated a rational design of efficient and durable high-entropy-based chromium tolerant cathode for SOFCs.
Layered perovskite-related GdBaFe 2 O 5+ δ (GBF) and GdBaFeCoO 5+ δ (GBFC) oxides are systematically studied as advanced air electrodes for intermediate-temperature solid oxide fuel cells (IT-SOFCs). The characterizations of the samples are gauged with the assistance of a variety of techniques, involving X-ray diffractometer (XRD), O 2 -temperature programmed desorption (O 2 -TPD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and Fourier transform infrared spectrometry (FT-IR). Results of XRD demonstrate that GBFC has the exact same crystal structure as that of GBF, which displays slight lattice shrinkage. Substitution of Co for Fe increases the TEC from 9.87 × 10 −6 K −1 and 16.6 × 10 −6 K −1 at 150–700 °C. GBFC shows the highest conductivity of 500 S cm −1 at 520 °C, which complies with the requirement for the cathode of the fuel cell. The polarization resistance ( R p ) values of GBF and GBFC are 0.33 Ω cm 2 and 0.07 Ω cm 2 at 650 °C, respectively. Moreover, a single cell based on Sm 0.8 Ce 0.2 O 1.9 (SDC) electrolyte-supported is indicative of a peak power density of 0.28 W cm −2 for GBFC cathode at 700 °C. This single cell also exhibits a superior operational stability utilizing dry hydrogen fuel at 600 °C during the tested 220 h. Electrochemical impedance spectroscopy (EIS) and relaxation time distribution (DRT) results are suggestive of the slowly decreasing oxygen reduction kinetics of GBFC cathode with the introduction of CO 2 or gaseous Cr species, which may be connected with the formation of carbonate or Cr depositions. Compared to classic materials, GBFC cathode shows very good electrochemical stability and CO 2 /Cr tolerance.
危险品化学品经营许可证（带存储）