Discharge behavior of Mg? wt % Ga? wt % Hg alloy as anode for seawater activated battery

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• 作者：Jun  ; Zhao ; Kun  ; Yu  ; ;   ; ^{yukungroup@gmail.com} ; Yanan  ; Hu ; Shaojun  ; Li ; Xin  ; Tan ; Fuwen  ; Chen ; Zhiming  ; Yu
• 关键词：Mg&ndash ; Ga&ndash ; Hg alloy ; Electrochemistry ; Discharge behavior ; Intermetallics ; Seawater activated battery
• 刊名：Electrochimica Acta
• 出版年：2011
• 出版时间：1 October 2011
• 年：2011
• 卷：56
• 期：24
• 页码：8224-8231
• 全文大小：1216 K

文摘

Magnesium¨Cgallium¨Cmercury alloy is one of the new developed anode materials for seawater activated batteries. The potentiodynamic polarization, galvanostatic discharge and electrochemical impedance spectroscopy of Mg? % Ga? % Hg alloy in seawater are studied and compared with commercial AZ31 and AP65 alloys in this study. The results show that Mg? % Ga? % Hg alloy exhibits different discharge behaviors in as-cast, homogenizing, rolling and annealing conditions. The annealing Mg? % Ga? % Hg sheet obtains the most negative corrosion potentials in different current densities. And the Mg? % Ga? % Hg alloy provides more negative corrosion potentials than AZ31 and AP65 alloys. EIS studies reveal that the Mg¨CGa¨CHg alloy/seawater interfacial process is determined by an activation-controlled reaction. The Mg₃Hg and Mg₂₁Ga₅Hg₃ phases improve the electrochemical properties of Mg? % Ga? % Hg alloy. The assembled prototype battery with Mg? % Ga? % Hg alloy as anode and CuCl as cathodes exhibits a satisfactory discharge performance because of the advantages in discharge characterizations and microstructure of the Mg? % Ga? % Hg alloy.