Fuchs David, Bayer Bernhard C, Gupta Tushar, Szabo Gabriel L, Wilhelm Richard A, Eder Dominik, Meyer Jannik C, Steiner Sandra, Gollas Bernhard
Institute for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, Graz A-8010, Austria.
Institute of Materials Chemistry, Vienna University of Technology (TU Wien), Getreidemarkt 9, Vienna A-1060, Austria.
ACS Appl Mater Interfaces. 2020 Sep 9;12(36):40937-40948. doi: 10.1021/acsami.0c11467. Epub 2020 Aug 26.
Graphene electrodes and deep eutectic solvents (DESs) are two emerging material systems that have individually shown highly promising properties in electrochemical applications. To date, however, it has not been tested whether the combination of graphene and DESs can yield synergistic effects in electrochemistry. We therefore study the electrochemical behavior of a defined graphene monolayer of centimeter-scale, which was produced by chemical vapor deposition and transferred onto insulating SiO/Si supports, in the common DES choline chloride/ethylene glycol (12CE) under typical electrochemical conditions. We measure the graphene potential window in 12CE and estimate the apparent electron transfer kinetics of an outer-sphere redox couple. We further explore the applicability of the 12CE electrolyte to fabricate nanostructured metal (Zn) and metalloid (Ge) hybrids with graphene by electrodeposition. By comparing our graphene electrodes with common bulk glassy carbon electrodes, a key finding we make is that the two-dimensional nature of the graphene electrodes has a clear impact on DES-based electrochemistry. Thereby, we provide a first framework toward rational optimization of graphene-DES systems for electrochemical applications.
石墨烯电极和深共熔溶剂（DESs）是两种新兴的材料体系，它们在电化学应用中各自展现出了极具前景的特性。然而，迄今为止，尚未测试石墨烯与DESs的组合在电化学中是否能产生协同效应。因此，我们研究了通过化学气相沉积制备并转移到绝缘SiO/Si载体上的厘米级特定石墨烯单层在典型电化学条件下于常见的DES氯化胆碱/乙二醇（12CE）中的电化学行为。我们测量了石墨烯在12CE中的电位窗口，并估算了外层球型氧化还原对的表观电子转移动力学。我们进一步探索了12CE电解质通过电沉积制备具有石墨烯的纳米结构金属（锌）和类金属（锗）杂化物的适用性。通过将我们的石墨烯电极与常见的块状玻璃碳电极进行比较，我们得出的一个关键发现是，石墨烯电极的二维性质对基于DES的电化学有明显影响。由此，我们为合理优化用于电化学应用的石墨烯 - DES体系提供了首个框架。
