( 浙江工業(yè)大學(xué) 應(yīng)用化學(xué)系，納米科學(xué)與技術(shù)工程研究中心，杭州 310032)
摘 要: 采用溶膠-凝膠法(sol-gel)制備了納米MnO2，并對其進(jìn)行了酸化和高溫處理。采用化學(xué)分析、XRD、紅外光譜、循環(huán)伏安、恒流放電等測試方法對處理前后的樣品進(jìn)行分析。研究結(jié)果表明，酸化后的樣品氧化度和表面積增大，粒徑減小，放電容量增大；經(jīng)過500 ℃高溫及酸化處理后的樣品，其氧化度更高，粒徑更小，其原因可能是高溫酸化后，樣品中的質(zhì)子與O2-更易結(jié)合， 從而使樣品的活性提高。制備的納米MnO2與電解二氧化錳（EMD）相比，在-0.4 V處，其放電容量高出52％。
關(guān)鍵字: 溶膠-凝膠法；納米尺寸；MnO2；電化學(xué)性能
CHU You-qun, ZHU Ying-hong
（ Department of Applied Chemistry, Research Center of Nano Science and Technology
Zhejiang University of Technology, Hangzhou 310032, China）
Abstract: Nano-size MnO2 power was prepared by sol-gel method, and it was acidified and thermal-acidified respectively. Samples were analyzed by chemical analysis, XRD, IR, constant current discharge and cyclic voltammetry. The results indicate that the acidification increases sample’s oxidation, decreases particle’s diameter, enlarges the surface area and the discharge capacity. The thermal-acidified treatment at 500 ℃ makes the oxidation of sample higher and particle diameter smaller. The proton of sample combines with O2- more favorably, so it improves the activity and the discharge capability remarkably. Compared with EMD, the discharge capacity of the sample after thermal-acidified treatment is about 52% larger than that of EMD at -0.4 V.
Key words: sol-gel method; Nano-size; MnO2; electrochemical performance
