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Electropolymerization of a Carbonyl-Modified Dihydropyrazine Derivative for Aqueous Zinc Batteries with Ultrahigh Cycling Stability
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2024-05-10 , DOI: 10.1021/acsami.4c02285
Dan Wang 1 , Yuxuan Bai 1 , Zixiang Zhou 1 , Qi Yao 1 , Wei Cao 2 , Yangmin Ma 1 , Chao Wang 1
Affiliation  

The design of aqueous zinc-ion batteries (ZIBs) that have high specific capacity and long-term stability is essential for future large-scale energy storage systems. Cathode materials with extended π-conjugation and abundant active sites are desirable to enhance the charge storage performance and the cycling stability of the aqueous ZIB. Based on this concept, 6,9-dihydropyrazino[2,3-g]quinoxaline-2,3,7,8(1H,4H)-tetrone was chosen as the monomer to be electropolymerized onto carbon cloth (PDHPQ-Tetrone/CC). When used as the cathode material for aqueous ZIBs, an exceptional cycling life (>20,000 cycles) at a current density of 10 A g–1 was achieved, with the specific capacity maintained at 82.8% and with the Coulombic efficiency at around 100% throughout cycling. At the charge–discharge current density of 0.1 A g–1, the ZIB with PDHPQ-Tetrone/CC achieved a high specific capacity of 248 mAh g–1. Kinetic analyses showed that both surface-capacitive-controlled processes and semi-infinite diffusion-controlled processes contribute to the stored charge. The charge storage mechanism was investigated with ex situ characterizations and involves the redox processes of carbonyl/hydroxyl and amino/imino groups coupled with insertion and extraction of both Zn2+ and H+.

中文翻译:


羰基改性二氢吡嗪衍生物的电聚合用于具有超高循环稳定性的水系锌电池



具有高比容量和长期稳定性的水系锌离子电池(ZIB)的设计对于未来的大规模储能系统至关重要。具有扩展的π共轭和丰富的活性位点的正极材料对于增强水性ZIB的电荷存储性能和循环稳定性是理想的。基于这一概念,选择6,9-二氢吡嗪基[2,3- g ]喹喔啉-2,3,7,8(1 H ,4 H )-四酮作为单体电聚合到碳布上(PDHPQ-Tetrone) /抄送)。当用作水系ZIB的正极材料时,在10 A g –1电流密度下实现了优异的循环寿命(>20,000次循环),比容量保持在82.8%,库仑效率始终保持在100%左右骑自行车。在0.1 A g –1的充放电电流密度下,具有PDHPQ-Tetrone/CC的ZIB实现了248 mAh g –1的高比容量。动力学分析表明,表面电容控制过程和半无限扩散控制过程都有助于存储电荷。通过异位表征研究了电荷存储机制,涉及羰基/羟基和氨基/亚氨基的氧化还原过程以及Zn 2+和H +的插入和提取。
更新日期:2024-05-10
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