二氧化锰对氧还原的电催化行为

二氧化锰对氧还原的电催化行为 ELECTROCATALYTICAL ACTIVITY OF MANGANESE DIOXIDES FOR OXYGEN REDUCTION 吴智远 Wu Zhiyuan first-author 周运鸿 Zhou Yunhong 高荣 Gao Rong 本文介绍了利用旋转环—盘电极技术研究三种不同晶型MnO 2 （α-δ,β和γ型）催化剂对氧还原的催化作用,分析了其反应动力学机理。实验结果表明:氧在三种不同晶型的MnO 2 上还原均径二电子过程的"串联机理"。α-δ型和β型的MnO 2 在阴极极化很大时,氧的还原仍处在动力学和扩散的联合控制之下,而γ型的MnO 2 在极化较大时,氧的还原基本上处于扩散控制。并且还可看出,氧的吸附速度也各有不同,在γ型MnO 2 上较大,而在α-δ和β型MnO 2 上较小。这种差别可能与各种不同晶型的MnO 2 催化剂的表面状态有关。 The present study examined electrocatalytical activity of the manganese dioxides with various structural types α—δ, β and γ types for oxygen redu-ction The experiments were carried out in alkaline solution using rotating ring-disk electrode method. The kinetics of oxygen reduction on the manganese dioxides were analysed The oxygen electroreduction on the manganese diox-ides in alkaline solution occurs only through the intermediate formation of hydrogen peroxide The reaction rate of the oxygen reduction on α—δ MnO 2 and β—MnO 2 was controled by combined diffusion and kinetics steps even at relatively negative potentials However, on γ—MnO 2 the reaction of oxygen reduction shown it to be conuroled by diffusion, step at same potertials, and adsorption rates of oxygenon the manganese dioxides were different. The differences may result from the surface state of the manganese dioxides 二氧化锰 氧还原 电催化 manganese dioxide oxygen reduction electrocatalyst 中国科学院科学基金 1988-03-01 2021-04-01 3