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Preparation and Electrocatalytic Property of Cobalt Sulfide/Porous Carbon Composite Catalyst Derived from ZIF67
Author NameAffiliationE-mail
LI Jing-Xiu College of Material Science and Science Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China  
ZHAO Yuan College of Material Science and Science Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
College of Engineering Materials, Jinling Institute of Technology, Nanjing 211169, China 		 
XUE Jian-Jun College of Material Science and Science Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China  
HE Ping-Ting College of Material Science and Science Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China  
WANG Ling College of Material Science and Science Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China wtianjing@nuaa.edu.cn 
Abstract: Cobalt sulfide/porous carbon (CoS/C) composite catalysts have been synthesized through combination of ion exchange method and heat treatment method with ZIF67 as precursor and thioacetamide as sulfur source. The effect of vulcanization time on the morphology, structure and oxygen reduction (ORR) performance of the composite catalyst were discussed. The morphology and structure of the composite catalyst were characterized by scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), N2 adsorption-desorption measurement, X-ray photoelectron spectroscopy (XPS), Raman spectroscopy (Raman) and rotating disk electrode (RDE) techniques. The results showed that the composite catalyst had the comparable ORR activity to commercial 20%(w/w) Pt/C catalyst in alkaline medium, and its half-wave potential was negative to the Pt/C catalyst only 31 mV. With the increase of vulcanization time, the cobalt sulfide particles gradually increased, and the degree of disorder of carbon materials in the catalyst first decreased and then increased. When the vulcanization time was 10 min, the composite catalyst showed the best ORR performance in alkaline medium (0.1 mol·L-1 KOH). The average number of transferred electrons in the ORR process could reach 3.72, close to 4, indicating that the ORR was a four electronic transfer process on the surface of the catalyst.
Keywords: electrocatalysis  cobalt sulfide/porous carbon  vulcanization time  oxygen reduction reaction  fuel cells
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LI Jing-Xiu,ZHAO Yuan,XUE Jian-Jun,HE Ping-Ting,WANG Ling.Preparation and Electrocatalytic Property of Cobalt Sulfide/Porous Carbon Composite Catalyst Derived from ZIF67[J].Chinese Journal of Inorganic Chemistry,2019,35(8):1363-1370.
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Chinese Journal of Inorganic Chemistry