This study investigates the microstructural characteristics and discharge performance of the as-rolled Mg-0.3Sn-0.3Al-0.1Zn anodes with and without annealing. The results demonstrate that as-rolled anode exhibits a bimodal grain structure with local elements segregated regions. After annealing, the anode presents the bimodal sized grain structure without elements segregation. The Mg-air battery assumed by the as-annealed Mg-0.3Sn-0.3Al-0.1Zn anode endows a high synergy between cell voltage and specific capacity at 10 mA cm (1.4132 V and 1472.76 mA h g). The improvement in cell voltage can be mainly attributed to the more negative open-circuit potential, lower discharge resistance and more porous discharge product film. The enhanced specific capacity is ascribed to the lower surface voltage potential difference on the anode, suppression of the chunk effect and real-time hydrogen evolution rate.

中文翻译：

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具有良好电压和容量协同作用的新型镁空气原电池稀镁负极的研制

本研究研究了经退火和未经退火的轧态 Mg-0.3Sn-0.3Al-0.1Zn 阳极的显微组织特征和放电性能。结果表明，轧制阳极呈现出具有局部元素偏析区域的双峰晶粒结构。退火后，阳极呈现双峰尺寸的晶粒结构，没有元素偏析。由退火态 Mg-0.3Sn-0.3Al-0.1Zn 负极构成的镁空气电池在 10 mA cm（1.4132 V 和 1472.76 mA hg）下具有电池电压和比容量之间的高度协同作用。电池电压的提高主要归因于更负的开路电位、更低的放电电阻和更多孔的放电产物膜。比容量的提高归因于阳极上较低的表面电势差、块效应的抑制和实时的析氢速率。