Uniform In Situ Grown ZIF-L Layer for Suppressing Hydrogen Evolution and Homogenizing Zn Deposition in Aqueous Zn-Ion Batteries,ACS Applied Materials & Interfaces

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Uniform In Situ Grown ZIF-L Layer for Suppressing Hydrogen Evolution and Homogenizing Zn Deposition in Aqueous Zn-Ion Batteries
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-08-28 , DOI: 10.1021/acsami.2c11313
Weixing He ₁ , Tengteng Gu ₁ , Xijun Xu ₁ , Shiyong Zuo ₁ , Jiadong Shen ₁ , Jun Liu ₁ , Min Zhu ₁

Affiliation

The hydrogen evolution and dendrite of Zn anode are the major troubles hindering the commercialization of aqueous Zn-ion batteries (AZIBs). ZIF-Ls, a typical metal–organic framework (MOF) with a highly ordered structure and abundant functional groups, seem to be the answer for the above bottlenecks. In this paper, a uniform ZIF-L layer was obtained on the Zn surface (Zn@ZIF-L) via an in situ synthesis method to moderate the solvation structure of solid–liquid interface electrolyte reducing the contact between water and Zn, thereby relieving the hydrogen evolution and corrosion. Furthermore, density functional theory (DFT) analysis reveals the binding energy of H (−4.01 eV) and Zn (−0.82 eV) for ZIF-L is superior to that of pure Zn (H (−1.49 eV) and Zn (−0.68 eV)). Due to the multifunctional ZIF-L layer, the Zn@ZIF-L can regulate Zn deposition to overcome the dendrite for obtaining a long-life Zn anode. Consequently, the modified Zn@ZIF-L anode can cycle for 800 h at 0.25 mA cm^–2 for 0.25 mAh cm^–2, while the bare Zn anode is only maintained for 422 h. Finally, a designed V₂O₅ grown on carbon cloth (V₂O₅@CC) was used as the cathode and coupled with the Zn@ZIF-L anode to assemble the full-cell. The Zn@ZIF-L//V₂O₅@CC full-cell possesses a capacity retention rate of 84.9% after 250 cycles at 0.5 C, prominently higher than Zn//V₂O₅@CC (40.7%).

中文翻译：

均匀原位生长 ZIF-L 层用于抑制水系锌离子电池中的氢析出和均匀锌沉积

锌负极的析氢和枝晶是阻碍水系锌离子电池（AZIBs）商业化的主要问题。ZIF-Ls 是一种典型的金属有机框架（MOF），具有高度有序的结构和丰富的官能团，似乎是上述瓶颈的答案。在本文中，通过原位在 Zn 表面（Zn@ZIF-L）上获得了均匀的 ZIF-L 层。一种缓和固-液界面电解质的溶剂化结构的合成方法，减少了水和锌之间的接触，从而缓解了析氢和腐蚀。此外，密度泛函理论 (DFT) 分析表明，ZIF-L 的 H (-4.01 eV) 和 Zn (-0.82 eV) 的结合能优于纯 Zn (H (-1.49 eV) 和 Zn (-0.68) eV))。由于多功能 ZIF-L 层，Zn@ZIF-L 可以调节 Zn 沉积以克服枝晶，从而获得长寿命的 Zn 负极。^{因此，改性 Zn@ZIF-L 阳极在 0.25 mA cm -2}和 0.25 mAh cm ^-2下可以循环 800 小时，而裸 Zn 阳极只能维持 422 小时。最后，在碳_布_（ V ₂O ₅ @CC) 用作阴极并与 Zn@ZIF-L 阳极耦合以组装全电池。Zn@ZIF-L//V ₂ O ₅ @CC 全电池在0.5 C下循环250次后容量保持率为84.9%，明显高于Zn//V ₂ O ₅ @CC (40.7%)。

更新日期：2022-08-28

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