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Key Laboratory of Biomass Materials Science and Technology of Ministry of Education， Northeast Forestry University，Harbin 150040，Heilongjiang，China
Published： 30 March 2024 ，
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黄佳琪,陈芋,裴飞飞等.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[J].木材科学与技术,2024,38(02):20-28.
HUANG Jiaqi,CHEN Yu,PEI Feifei,et al.Study on Preparation of Carbon Aerogel Derived from ZIF-67/Oxidized Nanocellulose and Its Electrochemical Properties[J].Chinese Journal of Wood Science and Technology,2024,38(02):20-28.
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 °C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 by high-temperature carbonization. The test results through Raman spectroscopy indicated that the CoO/C composite material has a high degree of graphitization. The electrochemical test and analysis showed that the double-layer capacitance of CoO/C electrode materials was closely related to their internal three-dimensional pore structure. Compared with other carbonization temperatures (500
600
800 ℃)
when the carbonization temperature was 700 °C
the CoO/C-700 aerogel electrode material has the optimal electrochemical performance with a specific capacitance of up to 92 F/g (0.5 A/g) and exhibits desirable rate performance and cycle stability.
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
TEMPO-oxidized nanocellulosecarbon aerogelimidazolate metal organic frameworkelectrode material
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