Dong Jun, Wang Shanshan, Xi Peng, Zhang Xinggao, Zhu Xinyu, Wang Huining, Huang Taizhong
School of Aerospace Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China.
Nanomaterials (Basel). 2023 Oct 9;13(19):2735. doi: 10.3390/nano13192735.
Exploring non-precious metal-based catalysts for oxygen reduction reactions (ORR) as a substitute for precious metal catalysts has attracted great attention in recent times. In this paper, we report a general methodology for preparing nitrogen-doped reduced graphene oxide (N-rGO)-supported, FeCo alloy (FeCo@N-rGO)-based catalysts for ORR. The structure of the FeCo@N-rGO based catalysts is investigated using X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, and transition electron microscopy, etc. Results show that the FeCo alloy is supported by the rGO and carbon that derives from the organic ligand of Fe and Co ions. The eletrocatalytic performance is examined by cyclic voltammetry, linear scanning voltammetry, Tafel, electrochemical spectroscopy impedance, rotate disc electrode, and rotate ring disc electrode, etc. Results show that FeCo@N-rGO based catalysts exhibit an onset potential of 0.98 V (vs. RHE) and a half-wave potential of 0.93 V (vs. RHE). The excellent catalytic performance of FeCo@N-rGO is ascribed to its large surface area and the synergistic effect between FeCo alloy and N-rGO, which provides a large number of active sites and a sufficient surface area.
探索用于氧还原反应（ORR）的非贵金属基催化剂作为贵金属催化剂的替代品，近年来已引起了极大关注。在本文中，我们报道了一种制备用于ORR的氮掺杂还原氧化石墨烯（N-rGO）负载的FeCo合金（FeCo@N-rGO）基催化剂的通用方法。使用X射线衍射、扫描电子显微镜、X射线光电子能谱和透射电子显微镜等对FeCo@N-rGO基催化剂的结构进行了研究。结果表明，FeCo合金由rGO和源自Fe和Co离子有机配体的碳负载。通过循环伏安法、线性扫描伏安法、塔菲尔法、电化学阻抗谱、旋转圆盘电极和旋转环盘电极等对电催化性能进行了研究。结果表明，FeCo@N-rGO基催化剂的起始电位为0.98 V（相对于可逆氢电极，RHE），半波电位为0.93 V（相对于RHE）。FeCo@N-rGO优异的催化性能归因于其大表面积以及FeCo合金与N-rGO之间的协同效应，这提供了大量的活性位点和足够的表面积。
