Université de Lorraine, CNRS, Laboratoire de Chimie Physique et Microbiologie pour les Matériaux et l'Environnement (LCPME), F-54000 Nancy, France.
Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China.
Int J Mol Sci. 2023 Mar 15;24(6):5599. doi: 10.3390/ijms24065599.
The study of planar energy storage devices, characterized by low-cost, high capacity, and satisfactory flexibility, is becoming a valuable research hotspot. Graphene, monolayer sp hybrid carbon atoms with a large surface area, always acts as its active component, yet there is a tension between its high conductivity and ease of implementation. Although the difficult-to-assemble graphene can easily achieve planar assemblies in its highly oxidized form (GO), the undesirable conductivity, even after proper reduction, still restricts its further applications. Here, a facile "Top-down" method has been proposed to prepare the graphene planar electrode via in situ electro-exfoliation of graphite supported on a piece of laser-cutting patterned scotch tape. Detailed characterizations have been performed to study its physiochemical property evolution during electro-exfoliation. The obtained flexible graphene planar electrodes show decent energy storage performance, e.g., 40.8 mF cm at a current density of 0.5 mA cm and an 81% capacity retention at a current density of 8 mA cm for the optimized sample G-240. Their high conductivity also makes it possible to couple them with other redox-active materials through electrodeposition to improve their performance, e.g., ferrocene-functionalized mesoporous silica film (Fc-MS), MnO, and polyaniline (PANI). The highest capacity was achieved with the PANI functionalized sample, which achieved a 22-fold capacity increase. In a word, the versatility, practicality, and adaptability of the protocol to prepare the planar graphene electrode proposed in this work make it a potential candidate to meet the continuously growing energy storage demands.
平面储能器件的研究具有低成本、高容量和令人满意的柔韧性等特点，正成为一个有价值的研究热点。具有大表面积的单层 sp 杂化碳原子的石墨烯通常作为其活性成分，但它的高导电性和易于实现之间存在紧张关系。尽管难以组装的石墨烯在其高度氧化的形式（GO）中很容易实现平面组装，但不理想的导电性，即使经过适当的还原，仍然限制了它的进一步应用。在这里，提出了一种简便的“自上而下”方法，通过在激光切割图案的胶带片上支撑的石墨进行原位电剥离来制备石墨烯平面电极。对其进行了详细的特性研究，以研究其在电剥离过程中物理化学性质的演变。所得到的柔性石墨烯平面电极表现出良好的储能性能，例如，在 0.5 mA cm 的电流密度下为 40.8 mF cm，在优化后的样品 G-240 中在 8 mA cm 的电流密度下保持 81%的容量。它们的高导电性还使其有可能通过电沉积与其他氧化还原活性材料结合以提高其性能，例如，二茂铁功能化介孔硅膜（Fc-MS）、MnO 和聚苯胺（PANI）。用功能化的 PANI 样品实现了最高的容量，其容量增加了 22 倍。总之，本工作中提出的制备平面石墨烯电极方案的多功能性、实用性和适应性使其成为满足不断增长的储能需求的潜在候选方案。
