Reversible Zn Metal Anodes Enabled by Trace Amounts of Underpotential Deposition Initiators
Reversible Zn Metal Anodes Enabled by Trace Amounts of Underpotential Deposition Initiators
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由微量欠电位沉积引发剂实现的可逆锌金属阳极
DOI：
10.1002/ange.202301192
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发表时间：
2023
影响因子：
--
通讯作者：
Dai Y
中科院分区：
文献类型：
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作者：
Dai Y
常规电解质添加剂对于均匀的锌（Zn）沉积不够有效，因为它们难以主动引导原子级Zn沉积。在这里，基于欠电位沉积（UPD），我们提出了一个“护送效应”的电解液添加剂在原子水平上的均匀Zn沉积。添加Ni ~（2+）后，金属Ni优先沉积，并引发Zn在Ni上的不可逆沉积。这有利于Zn的牢固成核和均匀生长，同时抑制副反应。除此之外，Ni在Zn剥离之后回溶到电解液中，而不影响界面电荷转移电阻。因此，优化的电池在1 mA cm−2下运行超过900 h（比空白电池长4倍以上）。 此外，还通过添加Cr ~（3+）和Co ~（2+）验证了“护航效应”的普遍性。这项工作将通过控制各种金属电池的界面电化学激发广泛的原子级原理。
Routine electrolyte additives are not effective enough for uniform zinc (Zn) deposition, because they are hard to proactively guide atomic‐level Zn deposition. Here, based on underpotential deposition (UPD), we propose an “escort effect” of electrolyte additives for uniform Zn deposition at the atomic level. With nickel ion (Ni2+) additives, we found that metallic Ni deposits preferentially and triggers the UPD of Zn on Ni. This facilitates firm nucleation and uniform growth of Zn while suppressing side reactions. Besides, Ni dissolves back into the electrolyte after Zn stripping with no influence on interfacial charge transfer resistance. Consequently, the optimized cell operates for over 900 h at 1 mA cm−2(more than 4 times longer than the blank one). Moreover, the universality of “escort effect” is identified by using Cr3+and Co2+additives. This work would inspire a wide range of atomic‐level principles by controlling interfacial electrochemistry for various metal batteries.