Li6.925+xLa3-xBaxZr1.925Sb0.075O12 (0≤x≤0.08) ceramics were prepared by conventional solid-state reaction. The crystal structure, microstructure, ionic conductivity were characterized using XRD, SEM and Impedance analysis. XRD results showed that all compositions have a single cubic garnet-like structure. Li6.945La2.98Ba0.02Zr1.925Sb0.075O12 showed the highest conductivity and the lowest activation energy. The enhancement of its ionic conductivity could be explained by the enhanced densification and occupation on Li2 site.

•Heavy substitution of Mg for Ni strongly suppressed the grain growth.•Suppressed electrode effect results in decreased permittivity.•Composition with active interface effect exhibits enhanced tunability.Effects of Mg substitution for Ni upon the structure, electric and dielectric properties of La2NiMnO6 ceramic have been investigated. Results show that Mg substitution for Ni strongly suppressed the grain growth. The impedance of La2Ni1−xMgxMnO6 ceramic monotonically increases while the dielectric constant and loss decrease with increasing x. The increase of impedance is attributed to the lowering of Ni ion with variable valance. The decreased dielectric properties can be explained by the enhanced grain and grain boundary effects.

Copper-ceria hybrid composite electrode prepared by electrochemical co-deposition was examined for their redox process and electrocatalytic activities towards the oxidation of methanol. The structure and morphology of electrodes were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. XRD pattern of the copper-ceria hybrid composite electrode exhibited some diffraction peaks of CeO2 and SEM micrograph showed that it was composed of grains and flakes. The energy dispersive spectroscopy (EDS) spectrum of this area also showed the presence of cerium. Cyclic voltammetry, CO stripping and chronoamperometry were performed to characterize electrocatalytic property of the prepared samples. In cyclic voltammetry studies and chronoamperometry, copper-ceria hybrid composite electrode towards oxidation of methanol showed a significantly higher response and long term stability. CO stripping results indicated the facile removal of intermediate poisoning species CO in the presence of CeO2, which was helpful for CO and methanol electro-oxidation.CO stripping voltammograms recorded in 0.1 mol/L NaOH solution at 10 mV/s on Cu/Cu (1) and Cu-CeO2/Cu hybrid composite (2) electrode

Isothermal gas–liquid equilibrium (GLE) data were reported at 298.15 K and 123.15 kPa for the absorption of dilute SO2 in aqueous glycerol solutions, in which SO2 partial pressures are calculated in the range of (0 to 140) Pa. The GLE data were obtained with uncertainties within ±0.02 K for temperatures, ± 0.133 kPa for total pressures, ± 3.5% for SO2 concentration in the gas phase, and ±5% for SO2 concentration in the liquid phase. The measurements showed that the solubility of dilute SO2 in the system of glycerol (1) + water (2) increases with the increasing glycerol concentrations in the whole composition, and the solubility of SO2 in the system of glycerol (1) + water (2) presents an extreme minimum of 60.1 mg·L–1 at the mass fraction of w1 = 1.00 when SO2 in the gas phase is designed at ySO2 = 5 × 10–4. In addition, UV, FTIR (Fourier transform infrared), 1H NMR, and fluorescence spectra in the absorption processes of SO2 in the system of glycerol (1) + water (2) were investigated to present important absorption mechanism. Based on the spectral results obtained, the possibility of intermolecular hydrogen bond formation by hydroxyl oxygen atoms in the glycerol molecule with hydrogen atom in the H2O molecule and S···O interaction formation by hydroxyl oxygen atom in the glycerol molecule with sulfur atom in the SO2 molecule are discussed.

Due to their physicochemical properties, Tm2O3 nanoparticles have been employed in bioanalytical applications. In this report, body-centered shaped Tm2O3 nanoparticles with size of about 10 nm were successfully synthesized by the hydrothermal homogeneous method and used as a novel electrochemical biosensing platform for glucose based on a Tm2O3–Nafion modified electrode. Transmission electron microscopy (TEM) and energy-dispersive spectroscopy (EDS) were used to characterize the Tm2O3 nanoparticles, and cyclic voltammetry (CV) was used to investigate the electrochemical behavior of the modified electrode. The experimental results showed that glucose oxidase (GOD) immobilized on the Nafion–Tm2O3 film achieved direct electron transfer with an apparent heterogeneous electron transfer rate constant (ks) of 3.27 ± 0.43 s−1 and kept its bioactivity. Confirmation of the retained bioactivity can be demonstrated by its bioelectrocatalytic activity to the reduction of dissolved oxygen. The GOD/Tm2O3/Nafion/GC electrode displayed potential application for the fabrication of glucose biosensors with a linear glucose response up to 7 mM. Additionally, the biosensor based on the Tm2O3 nanoparticle-modified electrode exhibited good stability and selectivity. The successful practice of using the Tm2O3 modified electrode for the direct electrochemical analysis of proteins and the bioelectrocatalytic activity of enzymes offers an efficient strategy and a new promising platform for the application of rare earth oxide materials in the field of electrochemical sensors.