氧在Ni-MnO2电极上的电催化还原

采用喷雾热解法合成了超细二氧化锰, 通过喷涂制作成Ni-MnO2薄膜电极, 结合SEM、AFM和电化学测试技术, 研究了碱性介质中氧在Ni-MnO2薄膜电极上的电催化还原过程. 发现二氧化锰颗粒呈片状, 是由球形前驱体烧结后碎裂而成; 通过快速循环伏安法检测到了MnO2电极上存在着中间态粒子的还原过程, 该粒子浓度可累积, 并逐渐消耗直至消失, 寿命可持续约200周循环; 结果表明, 该粒子对氧的还原具有特殊的电催化活性.

Oxygen Reduction on Ni-MnO2 Electrode in Alkaline Solution

Manganese dioxide was synthesized by a spray pyrolysis method and Ni-MnO2 film-type electrode was prepared by a spray-coating approach as well. SEM and AFM in combination with electrochemical measures were employed to characterize the microstructure, electrocatalytic properties, and the correlation between electroreduction of oxygen and electrocatalysis of the Ni-MnO2 electrode. A reductive process of intermediate particle was discovered by fast cyclic voltammograms. The concentration of the intermediate particle could be cumulated and its life could be up to about 200 cycles. The reduction of the intermediate particle was the main reason of highly electrocatalytical activity for oxygen reduction reaction.