采用溶胶一凝胶法结合二次高温烧结技术,制备了锰系钙钛矿催化剂.利用XRD和EDS对催化剂的物相与元素组成进行了分析,并利用电化学分析方法研究了催化剂的氧还原催化性能.XRD与EDS结果表明,N2气氛二次烧结不改变La0.7Sr0.3-MnO3物相组成,但NH3气氛二次烧结会造成Lao.7 Sr0.3MnO3分解.电化学结果表明,N2气氛二次烧结催化剂的氧还原催化活性高于NH3气氛二次烧结催化剂,其氧还原起始电势与极限电流分别为0.028 V(vs.Hg/HgO)和2.181 mA.cm-2(2 000 r/min).
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 higher 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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