MOF-templated synthesis of nitrogen-doped carbon for enhanced electrochemical sodium ion storage and removal

IF 10.8 2区 化学 Q1 CHEMISTRY, PHYSICAL
Zhuo Wang, Xue Bai, Kexin Zhang, Hongzhi Wang, Jiabao Dong, Yuan Gao, Bin Zhao
{"title":"MOF-templated synthesis of nitrogen-doped carbon for enhanced electrochemical sodium ion storage and removal","authors":"Zhuo Wang,&nbsp;Xue Bai,&nbsp;Kexin Zhang,&nbsp;Hongzhi Wang,&nbsp;Jiabao Dong,&nbsp;Yuan Gao,&nbsp;Bin Zhao","doi":"10.3866/PKU.WHXB202405002","DOIUrl":null,"url":null,"abstract":"<div><div>Water scarcity has become a prominent global challenge in the twenty-first century, prompting the rapid advancement of desalination technology. Capacitive deionization (CDI) stands out as a cost-effective solution for sustainable water purification. The electrode material plays a pivotal role in capacitive deionization, impacting the salt ion removal and charge storage capacity. Carbon-based materials, characterized by high surface area and electrical conductivity, are ideal materials for capacitive deionization. However, their effectiveness in salt ion removal is hindered by unclear pore structures and poor wettability, limiting salt ion transport and storage. In this study, nitrogen-doped hierarchical porous carbon is successfully synthesized through the carbonization of MOF-5 and melamine mixtures, wherein melamine serves as both a nitrogen source and porogenic agent. Through optimization of carbonization temperature, the resulting MOF-5-derived nanoporous carbon (referred to as NPC-800) retains the cubic morphology of MOF-5, possesses a large surface area (754.34 ​m<sup>2</sup> ​g<sup>−1</sup>), high nitrogen content (10.13 ​%), and favorable wettability. Electrochemical analysis reveals that the NPC-800 electrode demonstrates specific capacities of 91.8, 76.1, 66.3, 51.0, 28.0, and 15.2 mAh ​g<sup>−1</sup> ​at current densities of 0.2, 0.5, 1.0, 2.0, 4.0, and 6.0 ​A ​g<sup>−1</sup>, respectively, outperforming NPC-700 (26.3, 19.7, 13.1, 6.90, 2.30, and 1.30 ​mAh ​g<sup>−1</sup>) and NPC-900 (46.0, 37.8, 30.4, 21.3, 11.7, and 7.50 mAh ​g<sup>−1</sup>). The superior electrochemical performance of NPC-800 can be attributed to its maximal specific surface area, abundant pore structure, and optimal wettability, facilitating increased active sites for salt ion adsorption and diffusion. Moreover, NPC-800 exhibits low intrinsic resistance, rapid ion transfer kinetics, and exceptional cycling stability (50,000 cycles) with 100 ​% capacity retention at 5 ​A ​g<sup>−1</sup>. Further investigation into the CDI performance of NPC electrodes under different applied voltages (0.8, 1.0, and 1.2 ​V) and initial NaCl solution concentrations (100, 300, and 500 ​mg ​L<sup>−1</sup>) demonstrates the superior adsorption capacity of the NPC-800 electrode compared to the other two electrodes. Specifically, at 1.2 ​V in a 500 ​mg ​L<sup>−1</sup> salt solution, NPC-800 exhibits a faster salt adsorption rate (2.8 ​mg ​g<sup>−1</sup> ​min<sup>−1</sup>) and higher salt adsorption capacity (24.17 ​mg ​g<sup>−1</sup>) compared to NPC-700 and NPC-900. Consequently, the melamine-assisted synthesis of N-doped porous carbon materials holds promise as an optimal choice for capacitive deionization.</div></div>","PeriodicalId":6964,"journal":{"name":"物理化学学报","volume":"41 3","pages":"Article 100026"},"PeriodicalIF":10.8000,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"物理化学学报","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1000681824000262","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0

Abstract

Water scarcity has become a prominent global challenge in the twenty-first century, prompting the rapid advancement of desalination technology. Capacitive deionization (CDI) stands out as a cost-effective solution for sustainable water purification. The electrode material plays a pivotal role in capacitive deionization, impacting the salt ion removal and charge storage capacity. Carbon-based materials, characterized by high surface area and electrical conductivity, are ideal materials for capacitive deionization. However, their effectiveness in salt ion removal is hindered by unclear pore structures and poor wettability, limiting salt ion transport and storage. In this study, nitrogen-doped hierarchical porous carbon is successfully synthesized through the carbonization of MOF-5 and melamine mixtures, wherein melamine serves as both a nitrogen source and porogenic agent. Through optimization of carbonization temperature, the resulting MOF-5-derived nanoporous carbon (referred to as NPC-800) retains the cubic morphology of MOF-5, possesses a large surface area (754.34 ​m2 ​g−1), high nitrogen content (10.13 ​%), and favorable wettability. Electrochemical analysis reveals that the NPC-800 electrode demonstrates specific capacities of 91.8, 76.1, 66.3, 51.0, 28.0, and 15.2 mAh ​g−1 ​at current densities of 0.2, 0.5, 1.0, 2.0, 4.0, and 6.0 ​A ​g−1, respectively, outperforming NPC-700 (26.3, 19.7, 13.1, 6.90, 2.30, and 1.30 ​mAh ​g−1) and NPC-900 (46.0, 37.8, 30.4, 21.3, 11.7, and 7.50 mAh ​g−1). The superior electrochemical performance of NPC-800 can be attributed to its maximal specific surface area, abundant pore structure, and optimal wettability, facilitating increased active sites for salt ion adsorption and diffusion. Moreover, NPC-800 exhibits low intrinsic resistance, rapid ion transfer kinetics, and exceptional cycling stability (50,000 cycles) with 100 ​% capacity retention at 5 ​A ​g−1. Further investigation into the CDI performance of NPC electrodes under different applied voltages (0.8, 1.0, and 1.2 ​V) and initial NaCl solution concentrations (100, 300, and 500 ​mg ​L−1) demonstrates the superior adsorption capacity of the NPC-800 electrode compared to the other two electrodes. Specifically, at 1.2 ​V in a 500 ​mg ​L−1 salt solution, NPC-800 exhibits a faster salt adsorption rate (2.8 ​mg ​g−1 ​min−1) and higher salt adsorption capacity (24.17 ​mg ​g−1) compared to NPC-700 and NPC-900. Consequently, the melamine-assisted synthesis of N-doped porous carbon materials holds promise as an optimal choice for capacitive deionization.

Abstract Image

求助全文
约1分钟内获得全文 求助全文
来源期刊
物理化学学报
物理化学学报 化学-物理化学
CiteScore
16.60
自引率
5.50%
发文量
9754
审稿时长
1.2 months
期刊介绍:
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信