ZIF-67-derived Mn doped Co9S8 supported on N-Enriched porous carbon polyhedron as an efficient electrocatalyst for oxygen evolution reaction. (11th November 2021)

• Record Type: Journal Article
• Authors: Chen, Xiongwei; Li, Weixin; Gong, Cheng; He, Xuan; Chen, Hui; Du, Xing; Fang, Wei; Yang, Ling; Zhao, Lei
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 78(2021)
• Page Start: 38724
• Page End: 38732
• Publication Date: 2021-11-11
• Subjects: ZIF-67 -- Mn doping -- Co9S8 -- Oxygen evolution reaction; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2021.09.123
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Rational design of efficient oxygen evolution reaction (OER) electrocatalysts plays a significant role in various applications like water splitting and metal-air batteries. Simultaneous modulation of geometric and electronic structure is a promising strategy for boosting the electrocatalytic active of OER catalysts. Herein, a novel type of Mn doped Co9 S8 supported on N-enriched porous carbon polyhedron composite material (Mn–Co9 S8 /NC) is constructed via absorption-pyrolysis-sulfurization treatment of Zeolitic-imidazolate frameworks (ZIF-67). ZIF-67 derived N-enriched porous carbon polyhedron serves as the porous skeleton for anchoring numerous Co9 S8 nanoparticles. The results confirm that the incorporation of Mn in Co9 S8 /NC can improve the degree of graphitization compared with Co9 S8 /NC, implying the enhancement of the conductivity. Meanwhile, the incorporation of Mn can lead to electronic modulation of Co species to bump up the intrinsic activity of active site in Mn–Co9 S8 /NC. Due to the synergistic effect of Mn, Co9 S8 and porous carbon structure, the specific surface area and electronic structure are optimized, endowing the maximum utilization of active sites. The Mn–Co9 S8 /NC electrocatalyst exhibits superior OER activity with the overpotential of 286 mV at current density of 10 mA cm −2 in 1.0 M KOH electrolyte. This work provides prospective insights into the synergistic coupling of geometric and electronic structure of Metal-Organic Frameworks (MOFs) material for efficient electrocatalysts. Graphical abstract: Image 1 Highlights: Mn doped Co9 S8 supported on N-enriched porous carbon polyhedron has been prepared. The incorporation of Mn can optimize the electronic structure of Co. The degree of graphitization is enhanced due the incorporated Mn. The Mn–Co9 S8 /NC exhibits higher specific surface area. The Mn–Co9 S8 /NC exhibits superior OER activity with the overpotential of 286 mV.