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Electrochemical Performances of Mg-Li and Mg-Li-Ce Alloys

Author: XuYan
Tutor: CaoDianXue
School: Harbin Engineering University
Course: Applied Chemistry
Keywords: Metal-semi fuel cells Anode materials Mg-Li Mg-Li-Ce Electrolyte additives
CLC: TG146.22
Type: Master's thesis
Year: 2011
Downloads: 4
Quote: 0
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Abstract


Magnesium as the anode material of metal fuel cells has received broad attention because it has the advantages of high specific energy, high Faradic capacity, and more negative standard oxidation potential. However, magnesium suffers from several drawbacks including the parasitic corrosion reaction resulting in the evolution of hydrogen, the "negative difference effect" leading to the reduction of current efficiency, and the passive film formation causing voltage delay. Doping Mg with alloy elements and modifying the electrolyte by including additives can effectively improve the performance of Mg anode. In this study, the effects of the addition of Li and Ce to Mg and the use of sodium stannate and sodium fluoride in the electrolyte on the electrode discharge performance were studied.Mg-8Li, Mg-8Li-0.5Ce and Mg-8Li-1Ce alloys were prepared using vacuum induction melting method. The electrochemical performances of Mg, Mg-8Li, Mg-8Li-0.5Ce and Mg-8Li-1Ce electrodes in 0.7 mol·L-1lNaCl solution were investigated by means of potentiodynamic polarization, potentiostatic discharge and electrochemical impedance spectroscopy measurements. The surface morphology of the electrodes after discharge was analyzed by scanning electron microscopy. The effect of sodium stannate and sodium fluoride as electrolyte additives on the electrochemical performance of electrodes was investigated. The self-discharge rate and current efficiency of the electrodes were measured by mass loss method. The performance of Mg-H2O2 semi-fuel cell with Mg, Mg-8Li, Mg-8Li-0.5Ce and Mg-8Li-1Ce as the anode was evaluated, respectively. The electro-oxidation activity of the electrodes in 0.7 mol·L-1 NaCl solution follows the sequence:Mg-8Li>Mg-8Li-1Ce>Mg> Mg-8Li-0.5Ce. The current density of Mg-8Li electrode discharged at-0.8 V reached around 53 mA cm-2. Sodium stannate and sodium fluoride as the electrolyte additives effectively improved the electro-oxidation activity of Mg, Mg-8Li, Mg-8Li-0.5Ce and Mg-8Li-1Ce electrodes. The addition of sodium stannate into the electrolyte also improved the current efficiency for both intermittent discharge and continuous discharge. The Mg-H2O2 semi-fuel cell with Mg-8Li anode presented a maximum power density of 134 mW cm-2 in 0.7 mol·L-1 NaCl solution. The Mg-H2O2 semi-fuel cell with Mg-8Li-1Ce anode showed a maximum power density of 180 mW-cm"2 in 0.7 mol·L-1 NaCl+1 mmol·L-1 NaSnO3 solution.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallic materials > Non - ferrous metals and their alloys > Light non-ferrous metals and their alloys > Magnesium
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