Oxygen nonstoichiometry and thermodynamic quantities of Perovskite-Type La1- xSrxFeO3-δ(x=0.2, 0.5, 0.8)

In this work, the defect structure analysis of La1-xSrxFeO3-δ (x=0.2, 0.5, 0.8) was presented. Thermogravimetric measurements were performed to determine the change in oxygen nonstoichiometry (Δδ) with oxygen partial pressure (pO2) in 10-19 ≤ (pO2/atm) ≤ 0.21 and temperature in 750 ≤ (T/℃) ≤ 900 range. La1-xSrxFeO3-δ showed a clear electronic stoichiometric point around δ»3-x/2. The relative partial molar enthalpy (ho-hoo) and entropy (so-soo) of oxygen were calculated from δ-pO2-T relation by using Gibbs-Helmholtz equation. The negative sign of ho-hoo and so-soo indicated that the incorporation of oxygen was an exothermic process and showed that the experimentally observed variations in ho-hoo and so-soo with δ matched well with the statistical thermodynamic model proposed by Mizusaki[1]. The defect diagram analysis showed that in n-type regime Fe2+ concentration varied with (pO2)-1/4 whereas in p-type regime Fe4+ concentration varied with (pO2)1/4. Reference [1] J. Mizusaki et al. J. Solid State Chem. 67 (1987) 1-8

Evaluation of the high temperature solid Oxide cells using La0.1Sr0.9Co0.8Fe0.2O3-δ

The performance of the SOCs using La0.1Sr0.9Co0.8Fe0.2O3-δ (LSCF1982) was characterized by I-V measurement and electrochemical impedance spectroscopy (EIS). The distribution function of relaxation times of EIS was used to analyze the polarization resistance of the cells. The fitting was performed using the appropriate equivalent circuit through DRT analysis. Furthermore, we co-electrolyzed CO2 and H2O to obtain H2 / CO syngas as well as water splitting. The composition of syngas was investigated by gas chromatography and controlled by varying in-let gas composition

Ligand-Promoted Direct C–H Arylation of Simple Arenes: Evidence for a Cooperative Bimetallic Mechanism

A highly efficient catalyst for the direct C–H arylation of simple arenes was developed on the basis of a palladium–diimine complex. The developed catalyst exhibited the highest turnover number reported to date for the direct arylation of benzene due to increased stability provided by the diimine ligand. The reaction was also performed using only 2–3 equiv of simple arenes. Mechanistic studies in combination with kinetic measurements, isotope effect experiments, synthesis of possible intermediates, and stoichiometric reactions suggested that this reaction follows a cooperative bimetallic mechanism

Ligand-Promoted Direct C–H Arylation of Simple Arenes: Evidence for a Cooperative Bimetallic Mechanism

A highly efficient catalyst for the direct C–H arylation of simple arenes was developed on the basis of a palladium–diimine complex. The developed catalyst exhibited the highest turnover number reported to date for the direct arylation of benzene due to increased stability provided by the diimine ligand. The reaction was also performed using only 2–3 equiv of simple arenes. Mechanistic studies in combination with kinetic measurements, isotope effect experiments, synthesis of possible intermediates, and stoichiometric reactions suggested that this reaction follows a cooperative bimetallic mechanism

Synthesis of Cyclic Imides from Nitriles and Diols Using Hydrogen Transfer as a Substrate-Activating Strategy

An atom-economical and versatile method for the synthesis of cyclic imides from nitriles and diols was developed. The method utilizes a Ru-catalyzed transfer-hydrogenation reaction in which the substrates, diols, and nitriles are simultaneously activated into lactones and amines in a redox-neutral manner to afford the corresponding cyclic imides with evolution of H₂ gas as the sole byproduct. This operationally simple and catalytic synthetic method provides a sustainable and easily accessible route to cyclic imides