Ilnicka Anna, Skorupska Malgorzata, Romanowski Piotr, Kamedulski Piotr, Lukaszewicz Jerzy P
Faculty of Chemistry, Nicolaus Copernicus University in Torun, Gagarina 7, 87-100 Torun, Poland.
Centre for Modern Interdisciplinary Technologies, Nicolaus Copernicus University in Torun, Wilenska 4, 87-100 Torun, Poland.
Materials (Basel). 2020 May 2;13(9):2115. doi: 10.3390/ma13092115.
The constantly growing demand for active, durable, and low-cost electrocatalysts usable in energy storage devices, such as supercapacitors or electrodes in metal-air batteries, has triggered the rapid development of heteroatom-doped carbon materials, which would, among other things, exhibit high catalytic activity in the oxygen reduction reaction (ORR). In this article, a method of synthesizing nitrogen-doped graphene is proposed. Few-layered graphene sheets (FL-graphene) were prepared by electrochemical exfoliation of commercial graphite in a NaSO electrolyte with added calcium carbonate as a separator of newly-exfoliated FL-graphene sheets. Exfoliated FL-graphene was impregnated with a suspension of green algae used as a nitrogen carrier. Impregnated FL-graphene was carbonized at a high temperature under the flow of nitrogen. The N-doped FL-graphene was characterized through instrumental methods: high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy. Electrochemical performance was determined using cyclic voltamperometry and linear sweep voltamperometry to check catalytic activity in ORR. The N-doped electroexfoliated FL-graphene obeyed the four-electron transfer pathways, leading us to further test these materials as electrode components in rechargeable zinc-air batteries. The obtained results for Zn-air batteries are very important for future development of industry, because the proposed graphene electrode materials do not contain any heavy and noble metals in their composition.
对可用于储能设备（如超级电容器或金属空气电池中的电极）的活性、耐用且低成本的电催化剂的需求不断增长，这引发了杂原子掺杂碳材料的快速发展，这类材料在氧还原反应（ORR）中表现出高催化活性。本文提出了一种合成氮掺杂石墨烯的方法。通过在添加碳酸钙作为新剥离的少层石墨烯片层隔离剂的NaSO电解液中对商业石墨进行电化学剥离来制备少层石墨烯片（FL-石墨烯）。将剥离的FL-石墨烯用作为氮载体的绿藻悬浮液进行浸渍。浸渍后的FL-石墨烯在氮气流下高温碳化。通过高分辨率透射电子显微镜、X射线光电子能谱和拉曼光谱等仪器方法对氮掺杂的FL-石墨烯进行表征。使用循环伏安法和线性扫描伏安法测定电化学性能，以检查其在ORR中的催化活性。氮掺杂的电剥离FL-石墨烯遵循四电子转移途径，这促使我们进一步将这些材料作为可充电锌空气电池的电极组件进行测试。所获得的锌空气电池结果对未来工业发展非常重要，因为所提出的石墨烯电极材料在其组成中不包含任何重金属和贵金属。
