Yang Xu, Jingzhu Chen, Tao Li, Hexian Ma, Zhuoran Lv, Shicong Zhang, Hui Bi, Fuqiang Huang, Tianquan Lin
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引用次数: 0
Abstract
Aqueous zinc-carbon capacitors display application potential in green power and high-end equipment owing to their high security, large power and sustainability. The water-rich zinc anode-electrolyte interface (AEI) and disordered zinc-ion diffusion are the culprits triggering corrosion reactions and dendrite growth, threatening the sustainability of aqueous zinc-carbon capacitors. Herein, a polyfunctional biomolecular, vitamin B6, is introduced into the traditional aqueous electrolyte for customizing the functional AEI and fine-regulating the interfacial coordination environment of zinc ions. Specifically, the preferential anchoring of pyridine nitrogen enables trace vitamin (2.0 g L−1) to construct a robust AEI and suppress corrosion reactions. The hydroxyl function zone provides high-octane guidance for zinc-ion diffusion at the AEI, resulting in flat zinc (002) oriented growth. Consequently, the Zn//Zn symmetrical cell features an ultrahigh cumulative capacity of 4.0 Ah cm−2 under 34 % depth of discharge. The vitamin-optimized zinc-carbon capacitor features extended operational lifetimes exceeding 8 months (200 thousand cycles at 5.0 A g−1), and demonstrates a high areal capacity of averaging 0.68 mAh cm−2 and exceptional durability over 2000 hours at 1.0 A g−1 under a high discharge depth of zinc anode (averaging 11.6 %). This work offers valuable insights into sustainable and cost-effective zinc-carbon capacitors.
锌碳水电容器具有安全性高、功率大、可持续性好等优点,在绿色电力和高端设备中显示出巨大的应用潜力。富水锌阳极-电解质界面(AEI)和锌离子无序扩散是引发腐蚀反应和枝晶生长的罪魁祸首,威胁着含水锌-碳电容器的可持续性。本研究将维生素B6这一多功能生物分子引入到传统的水电解质中,以定制功能性AEI,精细调节锌离子的界面配位环境。具体来说,吡啶氮的优先锚定使微量维生素(2.0 g L-1)能够构建强大的AEI并抑制腐蚀反应。羟基功能区为锌离子在AEI处的扩散提供了高辛烷值的引导,导致扁平的锌(002)取向生长。因此,在34%的放电深度下,锌/锌对称电池具有4.0 Ah cm-2的超高累积容量。维生素优化的锌碳电容器具有超过8个月的使用寿命(5.0 A g-1下20万次循环),并且在1.0 A g-1下具有平均0.68 mAh cm-2的高面积容量,在高锌阳极放电深度(平均11.6%)下具有超过2000小时的优异耐用性。这项工作为可持续和具有成本效益的锌碳电容器提供了有价值的见解。
期刊介绍:
Angewandte Chemie, a journal of the German Chemical Society (GDCh), maintains a leading position among scholarly journals in general chemistry with an impressive Impact Factor of 16.6 (2022 Journal Citation Reports, Clarivate, 2023). Published weekly in a reader-friendly format, it features new articles almost every day. Established in 1887, Angewandte Chemie is a prominent chemistry journal, offering a dynamic blend of Review-type articles, Highlights, Communications, and Research Articles on a weekly basis, making it unique in the field.