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Abstract Germanium is considered as a potential anode material for sodium-ion batteries due to its fascinating theoretical specific capacity. However, its poor cyclability resulted from the sluggish kinetics and large volume change during repeated charge/discharge poses major threats for its further development. One solution is using its ternary compound as an alternative to improve the cycling stability. Here, high-purity CuGeO3 nanowires were prepared via a facile hydrothermal method, and their sodium storage performances were firstly explored. The as-obtained CuGeO3 delivered an initial charge capacity of 306.7 mAh g−1 along with favorable cycling performance, displaying great promise as a potential anode material for sodium ion batteries.

Highlights: [•] The CuGeO3 nanowires can be used for the electrochemical detection of phenyl acetic acid. [•] The detection limit is 9.1μM with a linear range of 0.01–2mM. [•] The CuGeO3 nanowire modified glassy carbon electrode exhibits good reproducibility, stability and sensibility. [ABSTRACT FROM AUTHOR]

Copper germanate (CuGeO3) nanowires are applied as the electrochemical modified materials for the electrochemical determination of benzoic acid (BA) in neutral solution. The electrochemical responses of BA at the CuGeO3 nanowire modified glassy carbon electrode (GCE) show two pairs of electrochemical cyclic voltammogram peaks (cvp) which originate from the nanowires. The linear range is 0.01-2 mM and detection limit is 6.3 μM for cvp1 at a signal-to-noise ratio of 3. The linear range and detection limit, respectively, are 0.001-2 mM and 0.91 μM for cvp2. Scan rate plays an important role on the electrochemical behavior of BA at the CuGeO3 nanowire modified GCE. There is a linear correlation between the anodic current and scan rate in the range of 25-200 mV s-1. The CuGeO3 nanowire modified GCE exhibits good stability and reproducibility. The good analytical performance indicates that the CuGeO3 nanowires have a potential application for the determination of BA. [ABSTRACT FROM AUTHOR]

Abstract: CuGeO3 nanowires in bulk with the diameter of 20–100nm and length of several dozens of micrometers have been synthesized via a facile hydrothermal process using GeO2 and Cu(CH3COO)2·H2O as the raw materials in the absence of any surfactants. The synthesized nanowires are single crystals with an orthorhombic phase based on the X-ray diffraction, scanning electron microscopy, transmission electron microscopy and high-resolution transmission electron microscopy characterizations. The dependence of different growth conditions, such as reaction temperature, reaction time, compactness, GeO2 concentration, copper source materials, surfactants and solvents on the formation, morphologies and sizes of CuGeO3 nanostructures have been investigated. Proper selection and combination of the growth conditions are the key aspect to control the formation, morphology and size of the CuGeO3 nanostructures. The nucleation and crystalline growth mechanism are proposed to explain the formation and growth of CuGeO3 nanowires. The photoluminescence spectrum of the CuGeO3 nanowires exhibits three fluorescence emission peaks centered at 421nm, 488nm and 529nm as the excitation wavelength is 235nm. [Copyright &y& Elsevier]

Germanium is considered as a potential anode material for sodium-ion batteries due to its fascinating theoretical specific capacity. However, its poor cyclability resulted from the sluggish kinetics and large volume change during repeated charge/discharge poses major threats for its further development. One solution is using its ternary compound as an alternative to improve the cycling stability. Here, high-purity CuGeO3 nanowires were prepared via a facile hydrothermal method, and their sodium storage performances were firstly explored. The as-obtained CuGeO3 delivered an initial charge capacity of 306.7 mAh g−1 along with favorable cycling performance, displaying great promise as a potential anode material for sodium ion batteries. [ABSTRACT FROM AUTHOR]