Tong Xin, Cherif Mohamed, Zhang Gaixia, Zhan Xinxing, Ma Jugang, Almesrati Ali, Vidal François, Song Yujun, Claverie Jerome P, Sun Shuhui
Institut National de la Recherche Scientifique-Énergie Matériaux et Télécommunications, Varennes, Quebec J3X 1S2, Canada.
School of Chemistry and Material Science, Guizhou Normal University, Guiyang 55000, China.
ACS Appl Mater Interfaces. 2021 Jul 7;13(26):30512-30523. doi: 10.1021/acsami.1c03141. Epub 2021 Jun 25.
Nitrogen and phosphorus-codoped graphene dots supported on nitrogen-doped three-dimensional graphene (N, P-GDs/N-3DG) have been synthesized by a facile freeze-annealing process. On the surface of the 3D interconnected porous structure, the N, P-GDs are uniformly dispersed. The as-prepared N, P-GDs/N-3DG material served as a metal-free catalyst for oxygen reduction reaction (ORR) in an alkaline medium and evaluated by a rotating ring-disk electrode. The N, P-GDs/N-3DG catalyst exhibits excellent ORR activity, which is comparable to that of the commercial Pt/C catalyst. Furthermore, it exhibits a higher tolerance to methanol and better stability than the Pt/C. This enhanced electrochemical catalytic performance can be ascribed to the presence of abundant functional groups and edge defects. This study indicates that P-N bonded structures play a vital role as the active sites in ORR.
通过简便的冷冻退火工艺合成了负载在氮掺杂三维石墨烯（N, P-GDs/N-3DG）上的氮磷共掺杂石墨烯量子点。在三维互连多孔结构的表面，N, P-GDs均匀分散。所制备的N, P-GDs/N-3DG材料作为碱性介质中氧还原反应（ORR）的无金属催化剂，并通过旋转环盘电极进行评估。N, P-GDs/N-3DG催化剂表现出优异的ORR活性，与商业Pt/C催化剂相当。此外，它对甲醇的耐受性更高，稳定性比Pt/C更好。这种增强的电化学催化性能可归因于大量官能团和边缘缺陷的存在。该研究表明，P-N键合结构作为ORR中的活性位点起着至关重要的作用。
