Inorganic Chemicals Industry

Preparation of ferrous ions etched α-MnO2 nanorods and its oxygen reduction performance

  • Han Jiaxi ,
  • Lan Bang ,
  • Zhou Zihao ,
  • Yu Lin ,
  • Sun Ming
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  • School of Chemical Engineering and Light Industry,Guangdong University of Technology,Guangzhou,510006,China

Online published: 2020-02-28

Abstract

One dimensional α-MnO2 nanorods were etched for surface modification by ferrous ion,and the nanorods with different etching degrees were obtained by a facile liquid phase redox reaction.Electrochemical studies indicated that the nanorods obtained under 20% etching conditions had higher activity than the pristine α-MnO2 and showed the accelerating kinetic process for the oxygen reduction reaction(ORR).On the contrary,30% over etched nanorods exhibited worse oxygen reduction and lower electrical conductivity.The improvement of ORR performance is attributed to the reduce of the Mn4+ and the rise of more Mn3+ active sites caused by the defects of the materials,which can accelerates the speed controlling step of O2 adsorption and the kinetic process of ORR.Excessive etching of 30% resulted in a significant decrease in the electrical con ductivity and a decline in the ORR performance.The results showed that moderate etching can make a balance between the defects exposure and electrical conductivity,and thus leading to high efficient oxygen reduction electrocatalysts.

Cite this article

Han Jiaxi , Lan Bang , Zhou Zihao , Yu Lin , Sun Ming . Preparation of ferrous ions etched α-MnO2 nanorods and its oxygen reduction performance[J]. Inorganic Chemicals Industry, 2019 , 51(11) : 73 -77 . DOI: 10.11962/1006-4990.2019-0004

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