材料科学
电动现象
阳极
化学工程
电解质
吸附
枝晶(数学)
水溶液
锌
分子
无机化学
纳米技术
电极
化学
有机化学
物理化学
工程类
冶金
数学
几何学
作者
Miao He,Chaozhu Shu,Anjun Hu,Ruixing Zheng,Minglu Li,Zhiqun Ran,Jianping Long
标识
DOI:10.1016/j.ensm.2021.11.010
摘要
Introducing artificial interface layer is a cost-effective strategy to inhibit parasitic reactions and dendritic growth on the zinc anode. However, boosting cation transfer while blocking anions and active water molecules through the interface layer is still a formidable challenge at current stage. Here, a zeolitic imidazolate framework (ZIF) based multi-functional interface layer is fabricated to prevent active water molecules reaching the deposition sites while increasing the cation concentration at the interface based on the coordinative self-concentration mechanism and electrokinetic effects, thus effectively inhibiting parasitic reactions and dendrite growth. Specifically, a super-saturated interfacial electrolyte layer is formed in the ZIF-11 layer because a large amount of water and large solvated molecule are removed in advance, eventually inhibiting the generation of hydrogen and basic zinc sulfate. Simultaneously, a thin electric double layer on the wall of the channel inside the interface layer can be formed due to the intense adsorption of zinc ions by the abundant zincophilic nitrogen-containing functional groups in the interface layer, leading to smooth electrokinetic surface conduction and stable deionization shock in the channel. These electrokinetic effects will jointly guide the distribution of zinc ions, thereby forming a uniform shock electrodeposition on the anode surface. Accordingly, the [email protected] based symmetric cells can operate stably for 1800 h, nearly 18 times longer than that of Cu-Zn based symmetric cells at 0.5 mA cm−2. And the [email protected] based aqueous Zn-ions hybrid supercapacitors (AC||[email protected] ZHCs) exhibit a reversible capacity of 58.6 mA h g−1 and the capacity retention is about 96.23% after 5000 cycles. Moreover, AC||[email protected] ZHCs can still run effectively for 5000 cycles even paired with the cathode with commercial-grade loading of 23.3 mg cm−2.
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