Synthesis of a high-temperature stable electrochemically exfoliated graphene
Synthesis of a high-temperature stable electrochemically exfoliated graphene
复制标题
DOI：
10.1016/j.carbon.2019.10.042
复制
发表时间：
2020-02-01
期刊：
影响因子：
10.9
通讯作者：
Roberts, Edward P. L.
中科院分区：
文献类型：
--
作者：
Sharif, Farbod;Zeraati, Ali Shayesteh;Roberts, Edward P. L.
提出了一种简便的电化学剥离石墨烯的新方法，可制备出具有优异高温稳定性的电化学剥离石墨烯。该方法是基于石墨烯在无机电解质(例如（NH4）（2)HPO4和（NH4）(2)SO4以及这些盐的不同组合）中的剥离，其中电解质组成被发现对石墨烯片的产率，形态，结构和高温稳定性有显着影响。使用（NH4）(2)HPO4电解质制备的石墨烯与其他电化学剥离的石墨烯相比，显示出最低的缺陷水平，并且在高达750摄氏度的空气中具有优异的高温稳定性；比典型的高表面积碳材料高得多，后者在空气中大约400 -500摄氏度时不稳定。在（NH4）(2)HPO4电解质中加入（NH4）(2)SO4改善了剥离过程，单层石墨烯片的产量从19%提高到接近50%。这些混合电解质还导致氮、磷和硫三掺杂石墨烯片具有更少的缺陷和在空气中的高温稳定性。这种简单的工艺为大规模制备掺杂石墨烯提供了一种有前途的方法，该方法具有更少的缺陷和特殊的性能，可用于各种应用。(C) 2019 Elsevier Ltd.版权所有。
A new and facile electrochemical exfoliation approach is proposed to produce better quality electro-chemically exfoliated graphene with excellent high-temperature stability. The method is based on graphene exfoliation in inorganic electrolytes (e.g. (NH4)(2)HPO4 and (NH4)(2)SO4 and different combinations of these salts) where the electrolyte composition was found to have a significant impact on the yield, morphology, structure, and high-temperature stability of the graphene sheets. The graphene prepared using (NH4)(2)HPO4 electrolyte showed the lowest level of defects in comparison to the other electro-chemically exfoliated graphene and an exceptional high-temperature stability in air, at temperatures of up to 750 degrees C; much higher than typical high surface area carbon materials which are unstable around 400 degrees C-500 degrees C in air. The addition of (NH4)(2)SO4 to the (NH4)(2)HPO4 electrolyte improved the exfoliation process and increased the production of single layer graphene sheets from 19% to similar to 50%. These hybrid electrolytes also led to nitrogen, phosphorus, and sulphur tri-doped graphene sheets with a fewer defects and high-temperature stability in air. This simple process offers a promising approach for large scale preparation of doped graphene with fewer defects and exceptional properties for various applications. (C) 2019 Elsevier Ltd. All rights reserved.