摘要
采用真空熔炼法制备了铸态Mg-8Li,Mg-8Li-0.5Ce和Mg-8Li-1Ce三种Mg-Li合金.采用Tafel极化曲线、恒电势氧化法和电化学阻抗谱法,研究了Mg,Mg-8Li,Mg-8Li-0.5Ce和Mg-8Li-1Ce电极作为Mg-H2O2半燃料电池的阳极材料在0.7 mol·L-1 NaCl溶液中的电化学行为.采用扫描电镜观测了电极放电前后的表面形貌.研究结果表明:在四种金属电极中,Mg-8Li-1Ce电极的腐蚀电位最正(-1.49 V),Mg电极的腐蚀电位最负(-1.66 V);在0.7 mol·L-1 NaCl溶液中,电极的电氧化活性排列顺序表示为:Mg-8Li>Mg-8Li-1Ce>Mg>Mg-8Li-0.5Ce,在-1.0 V电位下,Mg-8Li电极的放电电流密度约为40 mA·cm-2.表明Mg-8Li电极的电氧化活性最好,Li元素对Mg电极起到了"活化"作用.
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 as the anodes of Mg-H2O2 semi-fuel cells in 0.7 moloL-1 NaCl solution were investigated by means of poten-tiodynamic polarization,potentiostatic discharge and electrochemical impedance spectroscopy measure-ments.The surface morphology of the electrodes was observed by scanning electron microscopy.The results showed that the corrosion potential of Mg-8Li-1Ce（-1.49 V） is the most positive and the corrosion poten-tial of Mg（-1.66 V） is the most negative among the four electrodes.The electro-oxidation activity of the electrodes in 0.7 moloL-1 NaCl solution follows the sequence： Mg-8LiMg-8Li-1CeMgMg-8Li-0.5Ce.The current density of Mg-8Li electrode discharged at-1.0 V reached around 40 mAocm-2.The electro-oxidation activity of Mg-8Li is the highest among the four electrodes and the Li element ＂activated＂ Mg electrode.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2011年第19期2248-2252,共5页
Acta Chimica Sinica
基金
黑龙江省自然科学基金(No.B200809)
中央高校基本科研业务费专项资金(No.HEUCF101023)
超轻材料与表面技术教育部重点实验室开放课题资助项目
