Hassani S Sadegh, Ganjali M R, Samiee L, Rashidi A M, Tasharrofi S, Yadegari A, Shoghi F, Martel R
Center of Excellence in Electrochemistry, School of Chemistry, College of Science, University of Tehran, P.O. Box 14155-6455, Tehran, Iran.
Energy Technology Research Division, Research Institute of Petroleum Industry (RIPI), West Blvd. Azadi Sport Complex, P.O. Box 14665-137, Tehran, Iran.
J Nanosci Nanotechnol. 2018 Jul 1;18(7):4565-4579. doi: 10.1166/jnn.2018.15316.
Heteroatom doping into carbon structures is an effective approach to enhance the electrochemical performance of carbon materials. In the work presented here, the electrocatalysts including: nitrogen and co-doped nitrogen and sulfur on porous graphene (PG) were synthesized by different precursors. The physico-chemical properties of the prepared samples were determined using X-ray Diffraction (XRD), Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), N2 sorption-desorption, Transmission electron microscopy (TEM), Field Emission Scanning Electron Microscopy (FESEM) and X-ray photoelectron spectroscopy (XPS). The prepared samples were further applied for oxygen reduction reaction (ORR) and the effects of pyrolysis temperature, precursor type and dose, on the prepared samples structure and their electrochemical performances were investigated. The results revealed that synergistic effect of nitrogen and sulfur co-doped on the graphene structure leads to improvement in catalytic activity and current. Furthermore, S and N co-doped graphene prepared using sulfur trioxide pyridine complex exhibited excellent methanol tolerance and long-term stability.
将杂原子掺杂到碳结构中是提高碳材料电化学性能的有效方法。在本文介绍的工作中，通过不同的前驱体合成了包括氮掺杂以及氮和硫共掺杂的多孔石墨烯（PG）电催化剂。使用X射线衍射（XRD）、拉曼光谱、傅里叶变换红外光谱（FTIR）、N2吸附-脱附、透射电子显微镜（TEM）、场发射扫描电子显微镜（FESEM）和X射线光电子能谱（XPS）来测定所制备样品的物理化学性质。将所制备的样品进一步应用于氧还原反应（ORR），并研究了热解温度、前驱体类型和剂量对所制备样品结构及其电化学性能的影响。结果表明，氮和硫共掺杂对石墨烯结构的协同作用导致催化活性和电流的提高。此外，使用三氧化硫吡啶配合物制备的硫和氮共掺杂石墨烯表现出优异的甲醇耐受性和长期稳定性。
