Performance optimization of metal-supported solid oxide fuel cells using cathode and full cell impregnation with LaSrCoFeNbO electrode.

In this study, precursor solutions of LaSrCoFeNbO (LSCFN) symmetric electrode were prepared, and the applications of cathode impregnation and full cell impregnation in the preparation and performance optimization of four-layer metal-supported solid oxide fuel cells (MSCs) were thoroughly investigated. Test results indicate that the polarization impedance of cathode impregnated MSCs under H and CH atmospheres at 750 °C is approximately 0.1 Ω cm and 0.

Mechanistic Study on the Corrosion of (La,Sr)(Co,Fe)O Cathodes Induced by CO.

Solid Oxide Fuel Cell (SOFC) cathodes operating in ambient atmospheric conditions inevitably encounter CO contamination, leading to sustained performance deterioration. In this investigation, we examined the impact of CO on three variants of (La,Sr)(Co,Fe)O cathodes and employed the distribution of relaxation times method to distinguish distinct electrochemical processes based on impedance spectra analysis. We meticulously analyzed and discussed the corrosion resistance of these (La,Sr)(Co,Fe)O cathodes under high CO concentrations, relying on the experimental data.

Preparation and bifunctional properties of the A-site-deficient SrTiFeNiO perovskite.

The development of efficient, non-noble metal electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is crucial for their application in energy storage devices, such as fuel cells and metal-air batteries. In this study, SrTiFeNiO (STFN) perovskite was synthesized using the sol-gel method, and its electrocatalytic activity was evaluated using a rotating disk electrode (RDE) in an alkaline medium. STFN synthesized at the optimum synthesis temperature of 800 °C exhibited good ORR and OER performances.

Bidentate Ru(II)-NC Complex as a Catalyst for Semihydrogenation of Azoarenes to Hydrazoarenes with Ethanol.

The transfer hydrogenation of azoarenes to hydrazoarenes using ethanol as a hydrogen source by a bidentate Ru(II)-NC complex is developed. A weak base is crucial for this semihydrogenation that can efficiently avoid hydrazoarene dehydrogenation under strongly basic conditions. Control experiments and density functional theory calculations demonstrate the mechanism via a Meerwein-Ponndorf-Verley mechanism, and the only byproduct is ethyl acetate.

Construction of MOF-shell porous materials and performance studies in the selective adsorption and separation of benzene pollutants.

Metastable Cu2O is an attractive material for the architectural design of integrated nanomaterials. In this context, Cu2O was used as the sacrificial agent to form the core-shell structure of Cu2O@HKUST-1 by in situ growth technology. The MOFs with BOPs adsorption property were gathered together by a Cu2O etching method, and the hollow structure of the HKUST-1 shell material with fast BOP adsorption was successfully constructed.

Theoretical exploration about nitro-substituted derivatives of pyrimidine as high-energy-density materials.

A series of pyrimidine derivatives were constructed by replacing hydrogen atoms with nitro groups. To explore their thermal stability and kinetic stability, heat of formation (HOF) and dissociation energies (BDE) are calculated based on the density functional theory with the B3PW91/6-311+G(d,p)//MP2/6-311+G(d,p) method. Based on our calculations, all derivatives are confirmed stable enough to be synthesized in laboratory.

A new three-dimensional cobalt(II) coordination polymer with a 4-connected CdSO4-like topology.

The title cobalt(II) coordination polymer, poly[[diaquacobalt(II)]-mu4-3,3'-(p-phenylene)diacrylato], [Co(C12H8O4)(H2O)2]n, was obtained by reaction of Co(NO3)(2).6H2O and 3,3'-(p-phenylene)diacrylic acid (H2L) under hydrothermal conditions. Each Co(II) cation sits on a centre of inversion and is hexacoordinated by six O-atom donors in an octahedral geometry.

catena-Poly[[aqua-(pyrazino[2,3-f][1,10]phenanthroline-κN,N)cobalt(II)]-μ-pyrazine-2,3-dicarboxyl-ato-κNO:O].

In the title compound, [Co(C(6)H(2)N(2)O(4))(C(14)H(8)N(4))(H(2)O)](n), the Co atom is bonded to one N,N'-bidentate pyrazino[2,3-f][1,10]phenanthroline (Pyphen) ligand, one N,O-bidentate pyrazine-2,3-dicarboxyl-ate (PZDC) dianion and one water mol-ecule in a distorted octa-hedral mer-CoN(3)O(3) geometry. The Co(II) atoms are bridged by the PZDC dianions, forming an infinite one-dimensional chain running along the b axis. Adjacent chains pack together through π-π stacking inter-actions [centroid-centroid separations = 3.

catena-Poly[[aqua-(dipyrido[3,2-a:2',3'-c]phenazine-κN,N)iron(II)]-μ-pyrazine-2,3-dicarboxyl-ato-κN,O:O].

In the title compound, [Fe(C(6)H(2)N(2)O(4))(C(18)H(10)N(4))(H(2)O)](n), the Fe(II) ion adopts a slightly distorted octahedral mer-FeN(3)O(3) geometry, arising from one N,N'-bidentate dipyrido[3,2-a:2',3'-c]phenazine ligand, one N,O-chelating pyrazine-2,3-dicarboxyl-ate dianion and one water mol-ecule. An O-bonded symmetry-related dianion completes the coordination of the metal. The bridging dianion results in a one-dimensional polymeric chain.