微晶氧化石墨的制备及性能研究

以微晶石墨为原料, 采用改良的Hummers法, 经低温、中温与高温3阶段制备微晶氧化石墨。将微晶石墨、硝酸钠与高锰酸钾低温加入浓硫酸中, 经过中温进一步氧化, 最后高温滴加双氧水制得微晶氧化石墨。考察微晶石墨用量、高锰酸钾用量与低温反应时间对微晶氧化石墨制备的影响。采用X射线衍射仪对制得的微晶氧化石墨及其还原产物进行表征, 使用扫描电子显微镜观察样品形貌, 并结合三电极体系进行循环伏安法测试, 分析微晶氧化石墨及其还原产物的电化学性能。

Study on Preparation and Performance of Microcrystalline Graphite Oxide

Microcrystalline graphite oxide was prepared with microcrystalline graphite as raw material by modified Hummers method via three-stage treatment at low, medium and high temperature. Firstly, microcrystalline graphite, sodium nitrate and potassium permanganate were added into concentrated sulfuric acid at low temperature. After further oxidation at medium temperature, microcrystalline graphite oxide was finally obtained by adding hydrogen peroxide slowly at high temperature. The influences of graphite dosage, potassium permanganate dosage and reaction time at low temperature on the preparation of graphite oxide were investigated. The microcrystalline graphite oxide and reduction product were characterized by X-ray diffractometer. The morphology of the sample was observed by scanning electron microscope. In addition, the electrochemical properties were further investigated by cyclic voltammetry in a three-electrode system.