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氧还原反应(ORR)是一个复杂的过程,尤其在碱性电解液中,炭载型催化剂表面的ORR路径尤为复杂,因为碳本身可以催化ORR以二电子转移过程发生,产生过氧化氢,继而过氧化氢或者发生化学分解生成氧气(HODR),或者发生电化学还原生成OH(HORR).本文详细研究了ORR在常用氧化锰催化剂表面的反应路径.通过比较HODR和HORR的转换频率发现,尽管利用旋转环盘电极方法得到的表观电子转移数接近4,真实的ORR主要是2电子过程,反应生成的过氧化氢继而大部分发生化学分解生成氧气.该结果有助于理解碱性电解质中炭载型过渡金属氧化物电催化剂对ORR的催化行为.
Oxygen reduction (ORR) is a complex process, especially in alkaline electrolytes. The ORR path on the surface of carbon supported catalysts is particularly complicated because carbon itself can catalyze the ORR to occur as a two-electron transfer process that produces hydrogen peroxide and, in turn, Hydrogen peroxide is chemically decomposed to generate oxygen (HODR) or undergoes electrochemical reduction to generate OH (HORR) .In this paper, the reaction pathway of ORR on the surface of commonly used manganese oxide catalysts has been studied in detail.According to the comparison between HODR and HORR transition frequencies, The apparent electron transfer number obtained by the method of rotating ring disk electrode is close to 4, and the true ORR is mainly 2-electron process, and most of the hydrogen peroxide generated by the reaction is chemically decomposed to form oxygen. This result is helpful to understand that in alkaline electrolyte Catalytic Behavior of ORR Catalyzed by Carbon Supported Transition Metal Oxide Electrocatalysts.