The magnesium anode is one of the most promising metal anode candidates due to the great safety ascribed to it because it is free of sharp dendrites under general working conditions. However, a pure magnesium metal anode suffers from uneven plating, which could lead to voltage fluctuation and increasing polarization during cycling, affecting its cycle life. Here, Ce whose standard electrode potential (−2.34 V vs SHE) is extremely close to that of Mg (−2.37 V vs SHE) is introduced into magnesium as alloying element to form a magnesiophilic Mg-xCe alloy, alleviating the galvanic corrosion effect, preferentially adsorbing Mg²⁺ ions and effectively facilitating nucleation of Mg on the Mg-xCe alloy electrode surface, enhancing the cycle performance. Particularly, the optimized Mg-0.5Ce alloy displays 1932 h of Mg stripping/plating cycles. Elements with magnesiophilic ability and electrode potential close to magnesium can open a new design strategy for improving the electrochemical performance of the magnesium anode.

中文翻译：

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减轻电偶腐蚀的合金可实现均匀的镁沉积并具有较长的循环寿命

镁阳极是最有前途的金属阳极候选者之一，因为它在一般工作条件下没有锋利的枝晶，因此具有很高的安全性。然而，纯镁金属阳极电镀不均匀，可能导致循环过程中电压波动和极化增加，影响其循环寿命。这里，Ce的标准电极电位（-2.34 V vs SHE）与Mg的标准电极电位（-2.37 V vs SHE）极其接近，作为合金元素引入镁中，形成亲镁Mg- x Ce合金，减轻电偶腐蚀效应，优先吸附Mg ²⁺离子，有效促进Mg在Mg -x Ce合金电极表面形核，提高循环性能。特别是，优化的 Mg-0.5Ce 合金显示出 1932 小时的 Mg 剥离/电镀循环。具有亲镁能力和接近镁的电极电势的元素可以为提高镁阳极的电化学性能开辟新的设计策略。