A metal–organic-framework/carbon composite with enhanced bifunctional electrocatalytic activities towards oxygen reduction/evolution reactions. (6th July 2017)

• Record Type: Journal Article
• Authors: Fan, Tianyu; Yin, Fengxiang; Wang, Hao; He, Xiaobo; Li, Guoru
• Is Part Of: International journal of hydrogen energy. Volume 42:Number 27(2017)
• Page Start: 17376
• Page End: 17385
• Publication Date: 2017-07-06
• Subjects: Electrocatalyst -- Metal–organic frameworks -- Oxygen reduction reaction -- Oxygen evolution reaction; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2017.02.063
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: A Co-OBA/C (OBA = 4, 4′-Oxybis (benzoic acid)) composite catalyst was synthesized by integrating MOF (Co-OBA) with black carbon through a hydrothermal process. The catalyst was characterized using X-ray powder diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy and X-ray photoelectron spectroscopy. The catalytic activities toward the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) were evaluated by linear-sweep voltammetry (LSV) in an alkaline electrolyte. The ligand mode of the carboxylate binding is chelating coordination and the ligand mode of imidazole is monodentate ligand in the Co-OBA/C catalyst. The Co-OBA/C catalyst shows much better ORR, OER and bifunctional activities than the Co-OBA + C catalyst due to the synergistic effect between Co-OBA and carbon black in the Co-OBA/C catalyst. Graphical abstract: A Co-OBA/C (OBA = 4, 4′-Oxybis (benzoic acid)) composite catalyst was synthesized by integrating MOF (Co-OBA) with black carbon through a hydrothermal process. The Co-OBA/C catalyst shows much better ORR, OER and bifunctional activities than the Co-OBA + C catalyst due to the synergistic effect between Co-OBA and carbon black in the Co-OBA/C catalyst. Highlights: A Co-OBA/C composite was prepared through a hydrothermal process. The ORR and OER activities of the Co-OBA/C were greatly enhanced. The bifunctional activity of the Co-OBA/C catalyst were greatly enhanced. The interaction between Co-OBA and carbon black is beneficial for ORR and OER.