物理化学学报2025，Vol.41Issue(3)：94-103,10.DOI:10.3866/PKU.WHXB202405002
MOF模板法合成氮掺杂碳材料用于增强电化学钠离子储存和去除
MOF-Templated Synthesis of Nitrogen-Doped Carbon for Enhanced Electrochemical Sodium lon Storage and Removal
摘要
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(50000 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 material holds promise as an optimal choice for capacitive deionization.关键词
金属有机框架/电化学性能/钠离子储存/电容去离子/能源储存机制Key words
Metal-organic framework/Electrochemical property/Sodium ion storage/Capacitive deionization/Energy storage mechanism分类
化学引用本文复制引用
王卓,白雪,张可新,王鸿志,董家宝,高源,赵斌..MOF模板法合成氮掺杂碳材料用于增强电化学钠离子储存和去除[J].物理化学学报,2025,41(3):94-103,10.基金项目
The project was supported by the National Natural Science Foundation of China(22209114),the Chenguang Program of Shanghai Education Development Foundation and Shanghai Municipal Education Commission(21CGA56),the Natural Science Foundation of Shanghai(21ZR1445700),the Shanghai Sailing Program(21YF1430800). 国家自然科学基金(22209114)、上海市教育委员会和上海市教育发展基金会晨光计划(21CGA56)、上海市自然科学基金(21ZR1445700)和上海市青年科技英才扬帆计划(21YF1430800)资助项目 （22209114）
