Marinoiu Adriana, Raceanu Mircea, Carcadea Elena, Varlam Mihai
ICSI Energy Department, National Research and Development Institute for Cryogenic and Isotopic Technologies, 240050 Ramnicu Valcea, Romania.
Doctoral School, University Politehnica of Bucharest, 060042 Bucharest, Romania.
Nanomaterials (Basel). 2023 Mar 30;13(7):1233. doi: 10.3390/nano13071233.
Nitrogen-doped graphene is currently recognized as one of the most promising catalysts for the oxygen reduction reaction (ORR). It has been demonstrated to act as a metal-free electrode with good electrocatalytic activity and long-term operation stability, excellent for the ORR in proton exchange membrane fuel cells (PEMFCs). As a consequence, intensive research has been dedicated to the investigation of this catalyst through varying the methodologies for the synthesis, characterization, and technologies improvement. A simple, scalable, single-step synthesis method for nitrogen-doped graphene oxide preparation was adopted in this paper. The physical and chemical properties of various materials obtained from different precursors have been evaluated and compared, leading to the conclusion that ammonia allows for a higher resulting nitrogen concentration, due to its high vapor pressure, which facilitates the functionalization reaction of graphene oxide. Electrochemical measurements indicated that the presence of nitrogen-doped oxide can effectively enhance the electrocatalytic activity and stability for ORR, making it a viable candidate for practical application as a PEMFC cathode electrode.
氮掺杂石墨烯目前被认为是氧还原反应（ORR）最有前景的催化剂之一。它已被证明可作为一种无金属电极，具有良好的电催化活性和长期运行稳定性，非常适用于质子交换膜燃料电池（PEMFC）中的ORR。因此，通过改变合成方法、表征手段和技术改进，人们对这种催化剂进行了深入研究。本文采用了一种简单、可扩展的单步合成方法来制备氮掺杂氧化石墨烯。对从不同前驱体制备得到的各种材料的物理和化学性质进行了评估和比较，得出的结论是，由于氨的蒸气压高，有利于氧化石墨烯的官能化反应，因此氨可使最终的氮浓度更高。电化学测量表明，氮掺杂氧化物的存在可有效提高ORR的电催化活性和稳定性，使其成为作为PEMFC阴极电极实际应用的可行候选材料。
