Preparation of Pt/Co-N-C Electrocatalytic Material and Its ORR Performances in Alkaline Electrolyte

Abstract

Abstract: Metal-organic frameworks (MOFs) are regarded as effective precursors for the preparation of M-N-C oxygen reduction electrocatalytic materials. However, the structural collapse of MOFs during the pyrolysis limits their practical application. In this study, ZIF-67 was firstly modified by coating with the surfactant of F-127 and doping with Zn. After that, the modified Zn-ZIF-67@F-127 was pyrolyzed under argon atmosphere to fabricate the Co-N-C support with complete structure. By loading Pt on the surface of Co-N-C support, the Pt/Co-N-C composite catalyst for oxygen reduction reaction (ORR) was obtained. The ORR catalytic performances in the alkaline electrolyte were systematically studied. The experimental results show that the addition of F-127 can improve the morphological retention of Zn-ZIF-67@F-127 during the pyrolysis. More importantly, the onset potential, half-wave potential, and diffusion-limited current density of Pt/Co-N-C in O₂-saturated 0.1 mol·L^-1 KOH are 1.027 V, 0.836 V, and 5.51 mA·cm^-2, respectively, which are similar to those of the commercial 20% Pt/C catalyst. The synergistic effect of Pt and Co-N-C not only exhibits a high selectivity and current density for the ORR four-electron pathway, but also shows a high stability approaching the commercial 20% Pt/C catalyst, and superior methanol resistance performance compared with the commercial 20% Pt/C in the chronoamperometry test.

Key words: Pt/Co-N-C electrocatalytic material, oxygen reduction reaction, ZIF-67, F-127, alkaline electrolyte, methanol resistance performance

CLC Number:

O643.36

REN Zhili, DUAN Lei, XU Shoudong, CHEN Liang, YI Qun, ZHANG Ding. Preparation of Pt/Co-N-C Electrocatalytic Material and Its ORR Performances in Alkaline Electrolyte[J]. Journal of Synthetic Crystals, 2023, 52(4): 654-662.

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