Effect of Secondary Sintering Atmosphere on the Catalytic Activity of La0.7Sr0.3MnO3 for Oxygen Reduction
WANG Guangjin1,2, CHENG Fan1, XU Tian2, YU Yi2, WEN Sheng1, GONG Chunli1, LIU Hai1, WANG Jie1, ZHENG Genwen1, PAN Mu2
1 College of Chemistry and Materials Science, Hubei Engineering University, Xiaogan 432000; 2 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Hubei Provincial Key Laboratory of Fuel Cell, Wuhan University of Technology, Wuhan 430070;
Abstract: Herein, manganese-based pervoskite oxide was prepared by a sol-gel method combined with secondary sintering technology, and then characterized by means of XRD and EDS to analyze its phase and element composition, electrochemical measurement to investigate its catalytic activity for oxygen reduction reaction. XRD and EDS results showed that the phase of La0.7Sr0.3MnO3 remained intact after secondary sintering treatment under N2 atmosphere, while was destroyed under NH3 atmosphere. The electrochemical results showed that the catalytic activity of the catalyst prepared under N2 atmosphere for oxygen reduction reaction is hi-gher than that of catalyst prepared under NH3 atmosphere. The onset potential for oxygen reduction and limited current density are 0.028 V (vs. Hg/HgO) and 2.181 mA·cm-2 (2 000 r/mim), respectively.
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2017, Vol. 31 
