Influence of external heating rate on the structure and porosity of thermally exfoliated graphite oxide

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• 作者：Yang Qiu ; Samuel Moore ; Robert Hurt ; Indrek Kü ; laots ; ^{Indrek_Kulaots@brown.edu" class="auth_mail" title="E-mail the corresponding author}
• 刊名：Carbon
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：111
• 期：Complete
• 页码：651-657
• 全文大小：1723 K

文摘

Fast external heating rates in graphite oxide thermal exfoliation have been reported to be advantageous for generating high surface area graphene-based materials for a variety of applications. The study yields the surprising result that the surface area and porosity developed in reduced graphite oxide under some conditions are independent of instrument-set external heating rates. The true “total” heating rate experienced by the sample is shown to be the sum of the external rate and the local self-heating rate associated with the exothermicity of graphite oxide exfoliation, and under many conditions, the local self-heating contribution dominates. In these instances, increasing external heating rate does not increase the total rate, improve exfoliation degree or enhance surface area. These results are important for optimizing the conditions for fabrication of reduced graphene oxide with tailored properties.