Key Laboratory for Ecological Metallurgy of Multimetallic Mineral Ministry of Education

Shenyang, China

Key Laboratory for Ecological Metallurgy of Multimetallic Mineral Ministry of Education

Shenyang, China
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Liu A.,Northeastern University China | Liu A.,University of Alabama | Liu A.,Key Laboratory for Ecological Metallurgy of Multimetallic Mineral Ministry of Education | Shi Z.,Northeastern University China | And 2 more authors.
Electrochimica Acta | Year: 2017

In this work, urea and 1-butyl-3-methylimidazolium chloride (urea-BMIC) deep eutectic solutions were used as electrolytes for electrodeposition of lead from lead oxide. The electrochemical behavior of Pb (II) ions was investigated by cyclic voltammetry, chronopotentiometry, and chronoamperometry techniques at 353–373 K. Cyclic voltammograms and chronopotentiograms indicate that the reduction of Pb (II) ions to Pb is a diffusion-controlled quasi-reversible process and it proceeds via one step two-electron transfer process at −0.38 V (vs. Ag). The diffusion coefficient of Pb (II) ions increases from 3.22 × 10−8 cm2 s−1 to 1.49 × 10−7 cm2 s−1 as temperature increases from 353 K to 373 K. The activation energy for diffusion is determined to be 83.93 kJ mol−1. In addition, results from chronoamperometry show that lead deposition involves in a three-dimensional instantaneous nucleation and diffusion-controlled growth. On the other hand, the electrodeposit on a Cu substrate was pure Pb as confirmed by X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS). Scanning electron microscopy (SEM) image indicated that a uniform, dense, and non-dendritic coating with grain size of 3 μm in diameter was prepared by potentiostatic electrolysis at −0.4 V (vs. Ag). The optimized current efficiency (96.17%) and energy consumption (0.11 kWh kg−1) was obtained by potentiostatic electrolysis at −0.4 V (vs. Ag) and 373 K from urea-BMIC deep eutectic solutions containing 0.072 mol dm−3 PbO. © 2017 Elsevier Ltd


Li M.,Northeastern University China | Li M.,Key Laboratory for Ecological Metallurgy of Multimetallic Mineral Ministry of Education | Gao B.,Northeastern University China | Gao B.,Key Laboratory for Ecological Metallurgy of Multimetallic Mineral Ministry of Education | And 11 more authors.
Journal of Solid State Electrochemistry | Year: 2015

The electrodeposition behavior of cobalt in a urea-acetamide-LiBr melt was investigated using a tungsten electrode at 353 K. Cyclic voltammetry studies demonstrated that the reduction of Co(II) to Co is an irreversible, one-step, two-electron transfer process, and chronoamperometry experiments revealed that the electrodeposition of cobalt proceeds via 3D instantaneous nucleation with diffusion-controlled growth on the tungsten electrode. The electrodeposition of cobalt was performed at various cathodic potentials (−0.75 to −0.90 V) and temperatures (343 to 373 K) in a urea-acetamide-LiBr melt. The deposits were examined using scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), and X-ray diffraction (XRD). The SEM images revealed that uniform, dense, and compact deposits were obtained at more positive cathodic potentials between 343 and 353 K. The EDS and XRD analysis confirmed that the obtained deposits were pure cobalt. © 2015 Springer-Verlag Berlin Heidelberg

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