Allagui Anis, Abdelkareem Mohammad Ali, Alawadhi Hussain, Elwakil Ahmed S
Dept. of Sustainable and Renewable Energy Engineering, University of Sharjah, PO Box 27272, Sharjah, United Arab Emirates.
Center for Advanced Materials Research, University of Sharjah, PO Box 27272, Sharjah, United Arab Emirates.
Sci Rep. 2016 Feb 17;6:21282. doi: 10.1038/srep21282.
Recent years have shown an increased interest in developing manufacturing processes for graphene and its derivatives that consider the environmental impact and large scale cost-effectiveness. However, today's most commonly used synthesis routes still suffer from their excessive use of harsh chemicals and/or the complexity and financial cost of the process. Furthermore, the subsequent transfer of the material onto a substrate makes the overall process even more intricate and time-consuming. Here we describe a single-step, single-cell preparation procedure of metal-supported reduced graphene oxide (rGO) using the principle of bipolar electrochemistry of graphite in deionized water. Under the effect of an electric field between two stainless steel feeder electrodes, grapheme layers at the anodic pole of the wireless graphite were oxidized into colloidal dispersion of GO, which migrated electrophoretically towards the anodic side of the cell, and deposited in the form of rGO (d(002) = 0.395 nm) by van der Waals forces. For substrates chemically more susceptible to the high anodic voltage, we show that the electrochemical setup can be adapted by placing the latter between the wireless graphite and the stainless steel feeder anode. This method is straightforward, inexpensive, environmentally-friendly, and could be easily scaled up for high yield and large area production of rGO thin films.
近年来，人们对开发石墨烯及其衍生物的制造工艺越来越感兴趣，这些工艺考虑到了环境影响和大规模成本效益。然而，当今最常用的合成路线仍然存在过度使用苛刻化学品和/或工艺复杂及成本高昂的问题。此外，随后将材料转移到基板上使得整个过程更加复杂和耗时。在此，我们描述了一种利用去离子水中石墨的双极电化学原理，一步制备金属支撑还原氧化石墨烯（rGO）的单细胞制备方法。在两个不锈钢馈电电极之间的电场作用下，无线石墨阳极处的石墨烯层被氧化成氧化石墨烯的胶体分散体，该分散体通过电泳向电池阳极侧迁移，并通过范德华力以rGO（d(002) = 0.395 nm）的形式沉积。对于在高阳极电压下化学性质更敏感的基板，我们表明可以通过将基板置于无线石墨和不锈钢馈电阳极之间来调整电化学装置。该方法简单、廉价、环保，并且可以很容易地扩大规模以实现rGO薄膜的高产率和大面积生产。
