Adriana Vulcu, Teodora Radu, Alexandru Turza, Camelia Berghian-Grosan
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引用次数: 0
摘要
开发催化性能高、成本低的氧还原反应(ORR)电催化剂仍是一项挑战。本文介绍了碱性介质中氧还原反应的整体解决方案,包括从催化剂合成到催化剂再生,以及开发快速、可靠和简便的电极表面评估方法。我们重点研究了碱性介质中 ORR 的高效材料 α-Fe2O3 N 掺杂石墨烯(Fe-N-Gr)的开发和表征。电极表面记录的拉曼光谱证实了四电子转移 ORR 机制的关联途径。我们强调了通过简单的电化学方法进行催化剂再生的可能性。在氧气饱和的 1 M NaOH 中进行两轮再生和 1500 个循环后,催化剂仍保持 40.8% 的催化活性。最后,作为整体解决方案的一部分,我们证明了基于拉曼光谱测量和机器学习算法的方法可用于石墨烯基催化剂寿命调查。
Iron-based graphene composite for oxygen reduction reaction in alkaline media: Electrocatalytic activity and lifetime evaluation
The development of electrocatalysts with high catalytic performance and low costs for oxygen reduction reaction (ORR) is still challenging. Herein, an overall solution for ORR in alkaline media, from the catalyst synthesis to catalyst regeneration and to the development of a rapid, reliable and easy approach for electrode surface evaluation, is presented. We focused on the development and characterization of an efficient material for ORR in alkaline media, α-Fe2O3 N-doped graphene (Fe-N-Gr). The associative pathway for the four electron transfer ORR mechanism is sustained by the Raman spectra recorded from the electrode surface. We highlighted the possibility of catalyst regeneration by a simple electrochemical method. After two regeneration rounds and 1500 cycles in O2-saturated 1 M NaOH, the catalyst still retains 40.8 % catalytic activity. Finally, as a part of the overall solution, we demonstrated that a methodology based on Raman spectroscopic measurements and machine learning algorithms can be applied for graphene-based catalysts lifetime investigation.