Prestowitz Luke C O, Huang Jiaxing
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States.
ACS Omega. 2021 Jul 14;6(29):18663-18667. doi: 10.1021/acsomega.1c02589. eCollection 2021 Jul 27.
Hydrothermal treatment of graphene oxide (GO) aqueous dispersion has been extensively applied to create graphene (a.k.a., chemically modified graphene, or reduced GO) hydrogels, which were dried to yield high-density graphene monoliths and powders with promising potential for electrochemical energy storage applications. Here, we demonstrated a glycol-thermal route that allows the preparation of a graphene gel at around 150 °C, which is below the boiling point of ethylene glycol (EG) and thus eliminates the need for a sealed pressurized reaction vessel. As a result, flow synthesis can be achieved by flowing a GO dispersion in EG through a Teflon tube immersed in a preheated oil bath for continuous production of a graphene gel, which, upon drying, shrinks to yield a densified graphene solid.
氧化石墨烯（GO）水分散体的水热处理已被广泛应用于制备石墨烯（又称化学改性石墨烯或还原氧化石墨烯）水凝胶，将其干燥可得到高密度石墨烯块体和粉末，在电化学储能应用方面具有广阔的潜力。在此，我们展示了一种乙二醇热法，该方法可在约150°C下制备石墨烯凝胶，此温度低于乙二醇（EG）的沸点，因此无需密封加压反应容器。结果，通过使GO在EG中的分散体流经浸入预热油浴的聚四氟乙烯管以连续生产石墨烯凝胶，进而实现流动合成，干燥后，该凝胶收缩形成致密的石墨烯固体。
