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采用溶胶-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,N_2气氛二次烧结不改变La_(0.7)Sr_(0.3)MnO_3物相组成,但NH3气氛二次烧结会造成La_(0.7)Sr_(0.3)MnO_3分解。电化学结果表明,N_2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0.028V(vs.Hg/HgO)和2.181mA·cm~(-2)(2 000r/min)。
Manganese-based perovskite catalysts were prepared by sol-gel method combined with secondary high temperature sintering. The phase and elemental composition of the catalyst were analyzed by XRD and EDS. The catalytic performance of the catalyst for oxygen reduction was studied by electrochemical analysis. The results of XRD and EDS show that the secondary sintering of N_2 atmosphere does not change the phase composition of La 0.7 Sr 0.3 MnO 3, but the secondary sintering of NH 3 atmosphere can cause the decomposition of La 0.7 0.7 Mn 0.3. The results of electrochemical tests showed that the oxygen reduction catalytic activity of the secondary sintering catalyst in N_2 atmosphere was higher than that of the secondary sintering catalyst in NH3 atmosphere and the initial and limiting oxygen reduction potentials were 0.028V (vs.Hg / HgO) and 2.181mA · cm ~ (-2) (2 000 r / min).