Synthesis and Catalytic Performance Towards Oxygen Reduction of Fe/N Codoped Graphene
ZHU Guangbin1, BIAN Zhicheng1, HE Yulin1, LI Qianjin1, GUO Lulu1, LUO Zhihong1, LUO Kun2
1 College of Materials Science and Engineering,Guilin University of Technology,Guilin 541004,China 2 School of Materials Science and Engineering,Changzhou University,Changzhou 213164,China
Abstract: Aiming at making the oxygen reduction reaction of direct methanol fuel cell (DMFC) dynamically easier and reducing the utilization of commercial Pt/C catalysts, we introduced the Fe/N-codoped graphene (Fe/NG) to the DMFC as catalyst for oxygen reduction reaction (ORR), and investigated the synthesis approach and ORR catalytic performance of Fe/NG. Firstly, Fe ions absorbed polyaniline/graphene oxide was hydrothermally treated, subsequent heat treatments at 700 ℃, 800 ℃ and 900 ℃ in nitrogen atmosphere were carried out, and a series of Fe/N-codoped graphene composites (Fe/NG-700, Fe/NG-800 and Fe/NG-900) were obtained. Then, analysis of the Fe/NG products by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) proved that Fe element existed in the form of iron metal and ferric tetroxide, and nitrogen species primarily consisted of pyridine nitrogen and graphite nitrogen. Finally, the ORR catalytic activity and mechanism of the Fe/NG pro-ducts were measured by means of cyclic voltammetry (CV), rotating disk electrode (RDE) and rotating ring disk electrode (RRDE) in oxygen-saturated 0.1 mol/L KOH alkaline solution. It is demonstrated that the ORR catalyzed by Fe/NG-700, Fe/NG-800 and Fe/NG-900 showed four electron process with a hydrogen peroxide yield close to 0. Compared with 20% Pt/C, Fe/NG-700, Fe/NG-800 and Fe/NG-900 exhibited comparable activity and stability, superior methanol tolerance, which made Fe/NG a promising catalyst for direct methanol fuel cell.
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2020, Vol. 34 
