期刊
ACS APPLIED MATERIALS & INTERFACES
卷 14, 期 38, 页码 43180-43194出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c09787
关键词
Ammonia fluoride; ligand; sequence; supercapacitor; ZIF67; 2-methylimidazole
资金
- Ministry of Science and Technology (MOST) in Taiwan [MOST 111-2221-E-027-071-MY3]
In this study, a series of ZIF67 derivatives were synthesized using a one-step solution process with 2-Melm and ammonia fluoride incorporated in different sequences. By controlling the reaction duration and ligand addition order, ZIF67 derivative electrodes with high specific surface area and porosity were obtained, exhibiting excellent electrochemical performance.
The zeolitic imidazolate framework 67 (ZIF67) derivative is a potential active material of supercapacitors (SC), owing to high specific surface area and porosity and possible formation of cobalt compounds. A novel ZIF67 derivative is synthesized using a one-step solution process with cobalt precursor 2-methylimidazole (2-Melm) and ammonia fluoride in our previous work. Due to its facile synthesis and excellent electrocapacitive behavior, it is crucial to understand the competition between ammonia fluoride and 2-Melm on forming derivatives with cobalt ions and to create more efficient ZIF67 derivatives for charge storage. In this work, several ZIF67 derivatives are designed using a one-step solution process with 2-Melm and ammonia fluoride incorporated in different sequences. The reaction durations for a single ligand and two ligands are controlled. The largest capacity of 176.33 mAh/g corresponding to the specific capacitance of 1057.99 F/g is achieved for the ZIF67 derivative electrode prepared by reacting ammonia fluoride and a cobalt precursor for 0.5 h and then incorporating 2-Melm for another 23.5 h of reaction (NM0.5). This derivative composed of highly conductive CoF2, NiF2, Co(OH)F, and Ni(OH)F presents high specific surface area and porosity. The relevant SC presents a maximum energy density of 19.5 Wh/kg at 430 W/kg, a capacity retention of 92%, and Coulombic efficiency of 96% in 10000 cycles.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据