首页|富氮多孔碳纳米片的氮掺杂构型调控及其储锌性能

富氮多孔碳纳米片的氮掺杂构型调控及其储锌性能

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基于多孔碳正极和锌金属负极构建的水性锌离子电容器(ZICs)具有成本低、环境友好、安全性高和长期耐用等优点,近年来受到广泛关注.本文以具有共价有机框架结构(COF)的富氮聚合物为碳源前体,通过简单的炭化自活化策略,合成了富氮多孔碳纳米片(NPCN-x).研究表明,基于聚合物前体丰富的COF结构特点,炭化温度对所制备碳材料的氮含量和氮掺杂构型有显著影响,且碳材料表面的吡咯氮含量与其储锌性能呈现高度线性相关.优化后的NPCN-800其吡咯氮原子分数高达2.15%,作为ZICs的正极材料,在0.5A/g的电流密度下,展现出158mAh/g的高比容量和优异的循环稳定性.结合密度泛函理论计算发现,碳材料表面的吡咯氮构型具有优异的电化学活性,能够显著增强Zn离子的化学吸脱附过程.该研究为高性能ZICs用碳基电极材料的设计构建提供了新思路.
Tuning N-doped configurations of N-enriched porous carbon nanosheets for high-performance zinc ion storage
Aqueous zinc ion capacitors(ZICs)composed of porous carbon cathode and Zn metal anode have attracted great research interest in recent years due to their advantages of low cost,environmental friendliness,high safety,and long-term durability.This work first synthesized a N-containing polymer as the precursor by condensation of melamine chloride and p-phenylenediamine,and then fabricated N-enriched porous carbon nanosheets(NPCN-x)with a high N content(>10%)by a carbonization and self-activation strategy.The influence of carbonization temperature on the morphology,microstructure,surface chemical properties,and electrochemical performance of NPCN-x was investigated in detail.The results showed that carbonization temperature had a significant regulation effect on the N-doped configurations.It was revealed that the pyrrolic N configuration within NPCN-x materials played a crucial role in improving their electrochemical performance.As a consequence,the optimized NPCN-800 sample with the highest pyrrolic N content of 2.15%delivered a high specific capacity up to 158mAh/g at 0.5A/g and excellent cycling performance as the cathode for ZICs.To further explore the storage mechanism of Zn ions on the N-doped carbon surface during the electrochemical process,density functional theory(DFT)calculations were performed,which showed that the pyrrolic N configuration possessed the strongest adsorption capability for Zn ions,suggesting superior electrochemical activity in comparison to other N-doped configurations.This work provided a new insight from both theoretical and experimental perspectives for constructing porous carbon materials for high-performance ZICs.

porous carbon nanosheetsN-doped configurationszinc ion storageelectrochemistryoptimal design

刘思宇、杨卷、陈培、陈祖田、闫斌、刘育红、邱介山

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西安交通大学化学工程与技术学院,陕西 西安 710049

北京化工大学化学工程学院,北京 100029

多孔碳纳米片 氮掺杂调控 锌离子存储 电化学 优化设计

国家自然科学基金陕西省重点研发计划

222783282023-YBGY-292

2024

化工进展
中国化工学会,化学工业出版社

化工进展

CSTPCD北大核心
影响因子:1.062
ISSN:1000-6613
年,卷(期):2024.43(5)
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