Four Mg-x Zn-y Sn(x=2,4 and y=1,3 wt.%)alloys are investigated as anode materials for magnesium-air(Mg-air)battery.The self-corrosion and battery discharge behavior of these four Mg-Zn-Sn alloys are analyzed by electr...Four Mg-x Zn-y Sn(x=2,4 and y=1,3 wt.%)alloys are investigated as anode materials for magnesium-air(Mg-air)battery.The self-corrosion and battery discharge behavior of these four Mg-Zn-Sn alloys are analyzed by electrochemical measurements and Mg-air battery tests.The results show that addition of Sn stimulates the electrochemical activity and significantly improves the anodic efficiency and specific capacity of Mg-Zn alloy anodes.Among the four alloy anodes,Mg-2Zn-3Sn(ZT23)shows the best battery discharge performance at low current densities(≤5 m A cm^(-2)),achieving high energy density of 1367 m Wh g^(-1)at 2 mA cm^(-2).After battery discharging,the surface morphology and electrochemical measurement results illustrate that a ZnO and SnO/SnO_(2)mixed film on alloy anode surface decreases self-corrosion and improves anodic efficiency during discharging.The excessive intermetallic phases lead to the failure of passivation films,acting as micro-cathodes to accelerate self-corrosion.展开更多
Magnesium(Mg)is abundant,green and low-cost element.Magnesium-air(Mg-air)battery has been used as disposable lighting power supply,emergency and reserve batteries.It is also one of the potential electrical energy stor...Magnesium(Mg)is abundant,green and low-cost element.Magnesium-air(Mg-air)battery has been used as disposable lighting power supply,emergency and reserve batteries.It is also one of the potential electrical energy storage devices for future electric vehicles(EVs)and portable electronic devices,because of its high theoretical energy density(6.8 k Wh·kg^(-1))and environmental-friendliness.However,the practical application of Mg-air batteries is limited due to the low anodic efficiency of Mg metal anode and sluggish oxygen reduction reaction of air cathode.Mg metal as an anode material is facing two main challenges:high self-corrosion rate and formation of a passivation layer Mg(OH)_(2)which reduces the active surface area.In last decades,a number of Mg alloys,including Mg-Ca,Mg-Zn,commercial Mg-Al-Zn,Mg-Al-Mn,and Mg-Al-Pb alloys,have been studied as anode materials for Mg-air batteries.This article reviews the effect of alloying elements on the battery discharge properties of Mg alloy anodes.The challenges of Mg-air batteries are also discussed,aiming to provide a depth understanding for the theoretical and practical development of high-performance Mg-air batteries.展开更多
基金partially supported by the Marsden Fund managed by the Royal Society of New Zealand Te Apārangi(FastStart Marsden Grant project No.UOA1817)the scholarship from China Scholarship Council(No.201808060410)
文摘Four Mg-x Zn-y Sn(x=2,4 and y=1,3 wt.%)alloys are investigated as anode materials for magnesium-air(Mg-air)battery.The self-corrosion and battery discharge behavior of these four Mg-Zn-Sn alloys are analyzed by electrochemical measurements and Mg-air battery tests.The results show that addition of Sn stimulates the electrochemical activity and significantly improves the anodic efficiency and specific capacity of Mg-Zn alloy anodes.Among the four alloy anodes,Mg-2Zn-3Sn(ZT23)shows the best battery discharge performance at low current densities(≤5 m A cm^(-2)),achieving high energy density of 1367 m Wh g^(-1)at 2 mA cm^(-2).After battery discharging,the surface morphology and electrochemical measurement results illustrate that a ZnO and SnO/SnO_(2)mixed film on alloy anode surface decreases self-corrosion and improves anodic efficiency during discharging.The excessive intermetallic phases lead to the failure of passivation films,acting as micro-cathodes to accelerate self-corrosion.
基金partially supported by the Marsden Fund Council from Government funding,managed by Royal Society of New Zealand Te Apārangi(Fast-Start Marsden Grant project No.UOA1817)the scholarship from China Scholarship Council(No.201808060410)
文摘Magnesium(Mg)is abundant,green and low-cost element.Magnesium-air(Mg-air)battery has been used as disposable lighting power supply,emergency and reserve batteries.It is also one of the potential electrical energy storage devices for future electric vehicles(EVs)and portable electronic devices,because of its high theoretical energy density(6.8 k Wh·kg^(-1))and environmental-friendliness.However,the practical application of Mg-air batteries is limited due to the low anodic efficiency of Mg metal anode and sluggish oxygen reduction reaction of air cathode.Mg metal as an anode material is facing two main challenges:high self-corrosion rate and formation of a passivation layer Mg(OH)_(2)which reduces the active surface area.In last decades,a number of Mg alloys,including Mg-Ca,Mg-Zn,commercial Mg-Al-Zn,Mg-Al-Mn,and Mg-Al-Pb alloys,have been studied as anode materials for Mg-air batteries.This article reviews the effect of alloying elements on the battery discharge properties of Mg alloy anodes.The challenges of Mg-air batteries are also discussed,aiming to provide a depth understanding for the theoretical and practical development of high-performance Mg-air batteries.
