Preparation of heat-treated graphite felt electrode material modified by graphene oxide/graphene
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摘要: 通过高温热处理石墨毡，然后制备氧化石墨烯，并在氧化石墨烯基础上制备石墨烯，将氧化石墨烯和石墨烯与热处理石墨毡复合制备全钒液流电池正极材料。通过扫描电镜（SEM)、红外光谱（FTIR)、X-射线衍射分析(XRD)和电池充放电试验，测试分析石墨毡复合电极材料的表面形貌特征和电化学特性。结果表明：氧化石墨烯和石墨烯修饰的热处理石墨毡复合电极材料充放电性能增加。在电流密度30 mA/cm2条件下，氧化石墨烯/石墨毡复合电极电流效率高达94.713%，石墨烯/石墨毡复合电极电流效率高达96.482%。且热处理后石墨毡/石墨烯复合电极电化学活性最好。Abstract: Graphene oxide was prepared by heat treatment of the graphite felt, and the graphene was further obtained on basis of the graphene oxide. The cathode material of all-vanadium redox flow battery was finally prepared by compositing the graphene oxide, graphene and the heat-treated graphite felt. The surface morphologies and electrochemical properties of the composite electrode materials were characterized by scanning electron microscopy (SEM), Fourier transforms infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and charge-discharge test. The results show that the charge-discharge performances of composite electrode materials are improved. At the current density of 30 mA/cm2, the current efficiency of the graphene oxide/graphite felt composite electrodes reaches 94.713%, and the current efficiency of the graphene/graphite felt composite electrodes reaches 96.482%. The electrochemical activity of the graphite felt/graphene composite electrode is the best.
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图 3 氧化石墨烯/石墨烯修饰热处理石墨毡SEM形貌
400 ℃下处理6 h ：（a）石墨毡; （b）石墨毡吸附氧化石墨烯; （c）石墨毡吸附石墨烯
Figure 3. SEM of graphene oxide/graphene modified heat-treated graphite felt
图 4 氧化石墨烯/石墨烯修饰热处理石墨毡的红外光谱对比
400 ℃下处理6 h
Figure 4. FT-IR of graphene oxide/graphene modified heat-treated graphite felt
图 5 氧化石墨烯/石墨烯修饰热处理石墨毡充放电测试对比
400 ℃下处理6 h ：a-石墨毡吸附氧化石墨烯;b-石墨毡吸附石墨烯; c-石墨毡
Figure 5. Charge-discharge performances of graphene oxide/graphene modified heat-treated graphite felt
表 1 试验主要仪器
Table 1. Main instruments
仪器名称 型号 生产厂家 集热式恒温加热
磁力搅拌器DF-101S 河南省予华仪器有限公司 超声波清洗器 KH-100E 昆山禾创超声仪器有限公司 电动离心机 TDL-40B 金坛区西城新瑞仪器厂 循环水式多用真空泵 SHZ-D 河南省予华仪器有限公司 电热鼓风干燥箱 101型 北京市永光明医疗仪器有限公司 箱式电炉 SX2 上海浦东荣丰科技有限公司 高倍扫描电镜 EM3200 维仪通电子科技有限公司 红外光谱仪 NICOLET380 Perkin公司 X射线衍射仪 DX-2700 丹东浩元仪器有限公司 电池性能测试系统 CT-4008-
5V6A-164深圳市新威尔电子有限公司 
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表 2 不同条件处理石墨毡在电流密度30 mA/cm2条件下的充放电效率
Table 2. Charging and discharging efficiency of graphite felt treated with different conditions at current density of 30 mA/cm2
处理条件 处理温度/
℃处理时间/
h充放电效率/
%石墨毡 400 6 89.756 石墨毡热处理后吸附氧化石墨烯 400 6 94.713 石墨毡热处理后吸附石墨烯 400 6 96.482
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