Zhao Songlin, Chen Fushan, Zhang Qunfeng, Meng Lingtao
College of Chemical Engineering, Zhejiang University of Technology Hangzhou Zhejiang 310014 China
School of Pharmaceutical and Materials Engineering, Taizhou University Taizhou 318000 China
RSC Adv. 2021 Sep 2;11(47):29555-29563. doi: 10.1039/d1ra03255k. eCollection 2021 Sep 1.
Nitrogen-doped porous carbon materials have high potential in metal-free electrocatalysts, which is essential for several renewable energy conversion systems. Herein, we report a convenient and environment-friendly method to fabricate a nitrogen doped mesoporous carbon (NMC) using a nonionic surfactant of Pluronic F127 micelles as the template and a Schiff-base polymer (polyazine) as the precursor. The synthesized NMCs were of spheric morphology and mesoporous structures with surface area up to 1174 m g and high level of nitrogen (2.9-19 at%) and oxygen (4.9-7.4 at%) simultaneously doped. The electrochemical data of NMCs were analyzed in the context of the BET and XPS information. A correlation between ORR activity and the pyridinic-N was found. The NMC-700 demonstrate the highest electrocatalytic activity for ORR among the studied materials, which can be ascribed to the reasonable surface area and mesoporous structure, as well as the most abundant touchable pyridinic-N, thus providing more effective active sites for the oxygen reduction. In comparsion to the control sample, the NMC-700 provides the ORR electrocatalytic activity approximate to that of commercial Pt/C catalyst with a highly long-term stability.
氮掺杂多孔碳材料在无金属电催化剂方面具有很高的潜力，这对几种可再生能源转换系统至关重要。在此，我们报道了一种简便且环保的方法，以Pluronic F127胶束的非离子表面活性剂为模板，席夫碱聚合物（聚嗪）为前驱体，制备氮掺杂介孔碳（NMC）。合成的NMC具有球形形态和介孔结构，比表面积高达1174 m²/g，同时高水平地掺杂了氮（2.9 - 19 at%）和氧（4.9 - 7.4 at%）。结合BET和XPS信息对NMC的电化学数据进行了分析。发现ORR活性与吡啶氮之间存在相关性。在研究的材料中，NMC - 700对ORR表现出最高的电催化活性，这可归因于合理的比表面积和介孔结构，以及最丰富的可接触吡啶氮，从而为氧还原提供了更有效的活性位点。与对照样品相比，NMC - 700具有与商业Pt/C催化剂相近的ORR电催化活性和高度的长期稳定性。
