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中文摘要：
采用水溶液化学沉积法制备纳米二氧化锰，用于空气电极的氧还原电催化剂，利用SEM、XRD、XPS等手段表征其晶态及组成，以考察反应温度、合成时间等反应条件对样品晶型和微观形貌的影响规律。结果表明：可通过控制反应条件调控纳米二氧化锰的晶型和微观形貌，获得的样品粒径范围为5～500nm，其晶型和形貌分别为α—MnU纳米线、δ-MnO2花球和γ-MnO2纳米粒子。通过实验现象，总结了纳米二氧化锰晶型与微观形貌的演变趋势，分析了晶型变化的机理。
英文摘要：
Nano-manganesedioxide was prepared by chemical deposition in aqueous solution for the application as catalyst for oxygen reduction in air cathode. The morphology and structure were characterized by SEM,XRD and XPS to investigate the effect of reaction conditions, such as temperature and time,on the crystal morphology and nanostructure of the products. Results show that different crystals were obtained by controlling reaction conditions, including α-MnO2 nano-wires,ball-flowere-like δ-MnO2 and γ-MnO2 nanoparticles with particle size ranging in 5-500 nm. The evolution mechanism of nano-MnO2 in morphology and nanostructure was summarized.
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