硼氮掺杂多孔碳电极材料的制备及其储能性能  

Preparation and energy storage performance of boron-nitrogen-doped porous carbon electrode

作　　者：付时辉 李圆 王延青 FU Shihui;LI Yuan;WANG Yanqing(College of Polymer Science and Engineering,Sichuan University,Chengdu 610065,China;State Key Laboratory of Polymer Materials Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学高分子科学与工程学院,四川成都610065 [2]四川大学高分子材料工程国家重点实验室,四川成都610065

出　　处：《中国粉体技术》2024年第6期27-40,共14页China Powder Science and Technology

基　　金：国家自然科学基金项目,编号:U2330208;四川省科技计划资助项目,编号:2020YFH0104。

摘　　要：【目的】制备储能性能优良的混合超级电容器,开发可再生和清洁能源存储技术。【方法】采用多孔碳作为电极材料,对多孔碳掺杂硼(B)、氮(N)等元素,增加多孔碳缺陷数量,改善多孔碳的电化学储能性能;使用乙二胺四乙酸四钠作为碳源,以硼酸铵、硼酸钠与氯化铵作为B、N掺杂源,分别制备B、N共掺杂多孔碳(B-N-多孔碳)、无掺杂多孔碳以及B、N单独掺杂多孔碳(B-多孔碳、N-多孔碳);对制得的多孔碳电极材料进行测试与表征,并进行电化学性能分析,研究多孔碳电极材料的比容量、功率密度和循环稳定性等储能性能;通过温度优化实验确定制备B-N-多孔碳的最优煅烧温度。【结果】B-N-多孔碳的孔类型主要有微孔、中孔、大孔,比表面积为668 m^(2)/g,总孔容为0.9 cm^(3)/g;N、B、C、O元素分布均匀,N、B的质量分数分别为13.12%、3.24%;石墨化程度低,结构无序程度高,缺陷数量大,离子的吸附性能强,充放电性能最佳;拥有最大的比容量和容量保持率;电荷转移内阻最小,循环性能最佳,会产生赝电容行为。【结论】当硼酸铵添加量为20 mmol,煅烧温度为700℃时,制得的B-N-多孔碳具有最好的微观形貌结构与电化学性能。Objective Hybrid supercapacitors can achieve higher energy densities without compromising the device’s output power and cycle life.To develop hybrid supercapacitors with excellent energy storage performance and advance renewable,clean energy storage technologies,porous carbon is used as the electrode material.Porous carbon has a high specific surface area and specific capacitance,along with good physicochemical stability.However,issues like nanoplate aggregation and stacking result in low charge storage efficiency.Therefore,introducing foreign atoms into the carbon framework can alleviate the stacking phenomenon through the electrostatic repulsion of functional groups,while the heteroatoms provide more electrochemically active sites,enhancing charge storage capability.Doping porous carbon with elements like boron(B)and nitrogen(N)increases defects in the carbon structure,improving its electrochemical energy storage performance.Methods Ethylenediaminetetraacetic acid(EDTA)tetrasodium salt was used as the carbon source,while ammonium borate,sodium borate,and ammonium chloride were used as the B and N doping sources.The mixture was thoroughly stirred to obtain a solution,which was then subjected to repeated freezing and drying to produce the precursor.The precursor was calcined in a tube furnace under a nitrogen atmosphere at temperatures of 600℃,700℃,and 800℃with a heating rate of 5℃/min.After cooling,the samples were purified and filtered.The resulting B-N co-doped porous carbon(B-N-porous carbon),undoped porous carbon,and single-element doped porous carbon(B-porous carbon,N-porous carbon)samples were dried and ground.To study the specific capacitance,power density,and cycling stability of the porous carbon electrode materials,the samples were characterized and tested.Scanning electron microscope(SEM)and transmission electron microscope(TEM)were used to analyze the microstructure,energy dispersive spectrometer(EDS)for elemental composition,and Raman,X-ray diffraction(XRD),and X-ray photoelectron spectros

关 键 词：硼氮共掺杂 多孔碳 电极材料 超级电容器 储能性能 

分 类 号：TQ152[化学工程—电化学工业] TB44[一般工业技术]