Mengqi Bu,Li Yi,Yingjie Wen,Minli Wang,Hao Yang,Chaohao Chen,Dengsong Zhang,Xu Chen,Zhiyi Lu
Electro-activating peroxydisulfate (PDS) based on the cathode represents a highly promising advanced oxidation process; however, its longevity is constrained by cathode leaching. In this work, we demonstrate that the γ-FeOOH/Fe Foam and α-Fe 2 O 3 /Fe Foam obtained by engineering a protective layer containing iron and oxygen on Fe Foam exhibit significantly extended service life of 53 h and 47 h, 2.94-fold and 2.61-fold longer than that of the original Fe Foam (18 h), while showing similar pseudo-first-order kinetics. Structural evolution analysis and density functional theory simulations reveal that surface oxygen plays a crucial role in reducing the leaching of Fe from the cathode by immobilizing Fe ions and converting them in-situ into stable Fe 3 O 4 . The electro-activation mechanism of PDS on the cathode, the degradation pathways of atrazine (ATZ), and the effects of operating conditions are systematically investigated and elucidated. This work underscores the pivotal role of surface oxygen in prolonging the longevity of Fe-based cathodes, thereby contributing to the development of protective layers.
Designing and developing highly active and stable cathode materials is of great concern to large-scale commercial applications of solid oxide fuel cells (SOFCs). Herein, a series of perovskite oxides, La 0.5 Ba 0.5 Fe 1-x Zr x O 3-δ (LBFZ x O, x = 0∼0.075), are synthesized and systematically assessed. All LBFZ x O samples present cubic perovskite structure and possess better chemical compatibility with the SDC electrolyte. The introduction of Zirconium into the parent material yields lower thermal expansion coefficient and higher oxygen vacancy. Among all the components, La 0.5 Ba 0.5 Fe 0.95 Zr 0.05 O 3-δ achieves the lowest polarization resistant (0.076 Ω cm 2 ) and the highest power density (523 mWcm −2 ) at 800 °C, while rendering exceptional stability over a duration of 100 h. In addition, combining with the analyses of impedance and the distribution of relaxation times, the rate-determining steps for the entire oxygen reduction process are further clarified. The current research results highlight that La 0.5 Ba 0.5 Fe 0.95 Zr 0.05 O 3-δ is a viable cathode candidate for SOFCs.
危险品化学品经营许可证（带存储）