ZIF-67/氧化纳米纤维素衍生碳气凝胶的制备及其电化学性能研究  

Study on Preparation of Carbon Aerogel Derived from ZIF-67/Oxidized Nanocellulose and Its Electrochemical Properties

作　　者：黄佳琪 陈芋 裴飞飞 程万里[1] 韩广萍[1] HUANG Jiaqi;CHEN Yu;PEI Feifei;CHENG Wanli;HAN Guangping(Key Laboratory of Biomass Materials Science and Technology of Ministry of Education,Northeast Forestry University,Harbin 150040,Heilongjiang,China)

机构地区：[1]东北林业大学生物质材料科学与技术教育部重点实验室,黑龙江哈尔滨150040

出　　处：《木材科学与技术》2024年第2期20-28,35,共10页Chinese Journal of Wood Science and Technology

基　　金：双一流专项-创新人才培养“多级Janus结构静电纺复合纳米纤维的可控制备及其构筑机理”(000/41113102)。

摘　　要：为获得具有优异电化学性能的三维网络结构碳气凝胶,以TEMPO-氧化纳米纤维素(TEMPO-oxidized nanocellulose,TOCNF)为基体,加入ZIF-67混合均匀后,通过定向冷冻干燥和一步碳化法制备ZIF-67/TOCNF衍生的氧化钴/碳(CoO/C)气凝胶。扫描电子显微镜观察发现,CoO/C气凝胶能够维持碳化前ZIF-67/TOCNF的原始结构,并且由ZIF-67衍生的CoO可均匀负载在碳骨架结构中,提供更多的反应位点;XRD测试结果表明ZIF-67/TOCNF气凝胶显示了接近纯ZIF-67的典型ZIF-67晶体的衍射峰,而归属于TOCNF的衍射峰被抑制。Co是通过ZIF-67的热分解得到的,高温碳化能够得到更好结晶度的Co/C复合材料;拉曼光谱分析表明CoO/C复合材料的石墨化程度较高;电化学测试分析表明CoO/C电极材料的双电层电容与其内部的三维孔结构密切相关,相比于其他碳化温度(500、600、800℃),当碳化温度为700℃时,CoO/C-700气凝胶电极材料具有较优的电化学性能,其比电容可达92 F/g(0.5 A/g),同时表现出较好的倍率性能和循环稳定性。To obtain three-dimensional structured carbon aerogels with excellent electrochemical performance,cobalt oxide/carbon(CoO/C)aerogel derived from ZIF-67/TOCNF was prepared by directional freeze-drying and one-step carbonization,using TEMPO oxidized nanocellulose(TOCNF)as the matrix,adding ZIF-67.Results from scanning electron microscope(SEM)showed that the CoO/C aerogels can keep their original structure of ZIF-67/TOCNF before carbonization;CoO derived from ZIF-67 can be uniformly loaded in the carbon skeleton structure,providing more reaction sites.XRD analysis indicated that the ZIF-67/TOCNF aerogel showed that the diffraction peak of a typical ZIF-67 crystal was close to pure ZIF-67;the diffraction peak attributed to TOCNF was suppressed.Co was obtained via the thermal decomposition of ZIF-67.Co/C composite materials with better crystallinity were obtained byhigh-temperature carbonization.The test results through Raman spectroscopy indicated that the CoO/Ccomposite material has a high degree of graphitization.The electrochemical test and analysis showed thatthe double-layer capacitance of CoO/C electrode materials was closely related to their internal threedimensionalpore structure.Compared with other carbonization temperatures(500,600,800℃),whenthe carbonization temperature was 700℃,the CoO/C-700 aerogel electrode material has the optimalelectrochemical performance with a specific capacitance of up to 92 F/g(0.5 A/g)and exhibits desirablerate performance and cycle stability.

关 键 词：TEMPO-氧化纳米纤维素 碳气凝胶 咪唑酸盐金属有机骨架 电极材料 

分 类 号：S781[农业科学—木材科学与技术] TB34[农业科学—林学] TQ352.79[一般工业技术—材料科学与工程]