A Metal-Organic Framework Host for Highly Reversible Dendrite-free Zinc Metal Anodes
A Metal-Organic Framework Host for Highly Reversible Dendrite-free Zinc Metal Anodes
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DOI：
10.1016/j.joule.2019.02.012
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发表时间：
2019-05-15
期刊：
影响因子：
39.8
通讯作者：
Xia, Yongyao
中科院分区：
文献类型：
--
作者：
Wang, Zhuo;Huang, Jianhang;Xia, Yongyao
金属锌具有低成本、高容量、低潜力和环境友好的特点，是一种令人兴奋的水系储能装置负极材料。不幸的是，枝晶生长、有限的可逆性和不期望的析氢阻碍了其应用。在此，我们证明了在 500 摄氏度下退火的 MOF ZIF-8 (ZIF-8-500) 由于其多孔结构、骨架中含有微量锌以及高析氢过电位，可以用作高效（约 100%）、无枝晶镀锌和脱镀的主体材料。 Zn@ZIF-8-500阳极（即预镀10.0 mAh cm(-2) Zn的ZIF-8-500）与活性炭阴极或I-2阴极耦合，分别形成混合超级电容器或可充电电池。该超级电容器可提供 140.8 Wh kg(-1) 的高能量密度（标准化为电极中活性材料的质量），同时在 20,000 次循环后仍保留 72% 的容量，并且电池具有 1,600 次循环的长寿命。
Zinc metal featuring low cost, high capacity, low potential, and environmental benignity is an exciting anode material for aqueous energy storage devices. Unfortunately, the dendrite growth, limited reversibility, and undesired hydrogen evolution hinder its application. Herein, we demonstrate that MOF ZIF-8 annealed at 500 degrees C (ZIF-8-500) can be used as a host material for high-efficiency (approximately 100%) and dendrite-free Zn plating and stripping because of its porous structure, trace amount of zinc in the framework, and high over-potential for hydrogen evolution. The Zn@ZIF-8-500 anode (i.e., ZIF-8-500 pre-plated with 10.0 mAh cm(-2) Zn) is coupled with an activated carbon cathode or an I-2 cathode to form a hybrid supercapacitor or a rechargeable battery, respectively. The supercapacitor delivers a high energy density of 140.8 Wh kg(-1) (normalized to the mass of active materials in electrodes) while retaining 72% capacity over 20,000 cycles, and the battery shows a long life of 1,600 cycles.