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
在3.5wt%NaCl溶液中,采用极化曲线研究了AZ31、AZ61和AZ91电化学腐蚀性能。结果表明,随Al含量的增加,腐蚀电位先正移后负移,腐蚀电流密度先减小后增大。利用组装空气电池方法测试三者在电流密度为10 m A·cm^(-2)时的放电性能。AZ6...在3.5wt%NaCl溶液中,采用极化曲线研究了AZ31、AZ61和AZ91电化学腐蚀性能。结果表明,随Al含量的增加,腐蚀电位先正移后负移,腐蚀电流密度先减小后增大。利用组装空气电池方法测试三者在电流密度为10 m A·cm^(-2)时的放电性能。AZ61具有最稳定的放电曲线,最小的电压滞后问题,阳极效率高达50.26%。AZ61中含有不连续短粗条状和大颗粒状的β相,放电物质脱落较少。AZ61被认为是AZ系合金中最适合用作空气电池负极的材料。展开更多
镁电池具有比能量高(2 202 m Ah/g),电极电位为负(-2.36 V),较锂电池价格便宜,且放电平稳、无毒,结构简单,是21世纪的理想新能源,在综述了镁一次电池、镁二次电池、镁空气电池和双电解液镁电池的工作原理、特点及其应用现状的基础上,讨...镁电池具有比能量高(2 202 m Ah/g),电极电位为负(-2.36 V),较锂电池价格便宜,且放电平稳、无毒,结构简单,是21世纪的理想新能源,在综述了镁一次电池、镁二次电池、镁空气电池和双电解液镁电池的工作原理、特点及其应用现状的基础上,讨论了镁电池的发展方向。展开更多
Mg-Sn-Y alloys with different Sn contents(wt%)were assessed as anode candidates for Mg-air batteries.The relationship between microstructure(including the second phase,grain size,and texture)and discharge properties o...Mg-Sn-Y alloys with different Sn contents(wt%)were assessed as anode candidates for Mg-air batteries.The relationship between microstructure(including the second phase,grain size,and texture)and discharge properties of the Mg-Sn-Y alloys was examined using microstructure observation,electrochemical measurements,and galvanostatic discharge tests.The Mg-0.7Sn-1.4Y alloy had a high steady discharge voltage of 1.5225 V and a high anodic efficiency of 46.6% at 2.5 mA·cm^(-2).These good properties were related to its microstructure:small grain size of 3.8μm,uniform distribution of small second phase particles of 0.6μm,and a high content(vol%)of(1120)/(1010)orientated grains.The scanning Kelvin probe force microscopy(SKPFM)indicated that the Sn_(3)Y_(5) and MgSnY phases were effective cathodes causing micro-galvanic corrosion which promoted the dissolution of Mg matrix during the discharge process.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.
文摘在3.5wt%NaCl溶液中,采用极化曲线研究了AZ31、AZ61和AZ91电化学腐蚀性能。结果表明,随Al含量的增加,腐蚀电位先正移后负移,腐蚀电流密度先减小后增大。利用组装空气电池方法测试三者在电流密度为10 m A·cm^(-2)时的放电性能。AZ61具有最稳定的放电曲线,最小的电压滞后问题,阳极效率高达50.26%。AZ61中含有不连续短粗条状和大颗粒状的β相,放电物质脱落较少。AZ61被认为是AZ系合金中最适合用作空气电池负极的材料。
文摘Mg-Sn-Y alloys with different Sn contents(wt%)were assessed as anode candidates for Mg-air batteries.The relationship between microstructure(including the second phase,grain size,and texture)and discharge properties of the Mg-Sn-Y alloys was examined using microstructure observation,electrochemical measurements,and galvanostatic discharge tests.The Mg-0.7Sn-1.4Y alloy had a high steady discharge voltage of 1.5225 V and a high anodic efficiency of 46.6% at 2.5 mA·cm^(-2).These good properties were related to its microstructure:small grain size of 3.8μm,uniform distribution of small second phase particles of 0.6μm,and a high content(vol%)of(1120)/(1010)orientated grains.The scanning Kelvin probe force microscopy(SKPFM)indicated that the Sn_(3)Y_(5) and MgSnY phases were effective cathodes causing micro-galvanic corrosion which promoted the dissolution of Mg matrix during the discharge process.
