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首页> 外文期刊>International Journal of Electrochemical Science >Evaluation of the Porosity and the Nano-structure Morphology of MnO2 Prepared by Pulse Current Electrodeposition
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Evaluation of the Porosity and the Nano-structure Morphology of MnO2 Prepared by Pulse Current Electrodeposition

机译：脉冲电流电沉积制备的MnO 2 的孔隙率和纳米结构形态的评价

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摘要

Manganese dioxide samples were prepared by pulse current electrodeposition. The effects of the pulsecurrent parameters on the type of hysteresis loop of the adsorption isotherms, the surface area, andnano-structure morphology of the samples were investigated in details by using the Barrett–Joyner–Halenda (BJH) method and the Scanning Electron Microscopy (SEM) technique. Results indicate thatthe applied duty cycles play key roles in different characteristics of the samples. Samples obtained atduty cycles up to 30% show a decreasing trend of the surface area as well as increasing grain size andrepresent a type H4 hysteresis as duty cycles decrease. At duty cycle of 30%, the surface area has beenincreased, whereas at higher duty cycle of 70%, a decrease in surface area and the grain size ofsamples has been observed. Even though type H2 hysteresis prevailed at duty cycles higher than 70%,an overlapping of both type H4 and H2 hysteresis loops were obtained at duty cycles lower than 70%.These behaviors were explained and discussed on the basis of the formation and dissolutionmechanism of the passive layers during on- and off-times.
机译：通过脉冲电流电沉积制备二氧化锰样品。使用Barrett-Joyner-Halenda（BJH）方法和扫描电子显微镜（ SEM）技术。结果表明，所施加的占空比在样品的不同特性中起着关键作用。占空比高达30％的样品显示出表面积减小的趋势以及晶粒尺寸的增加，并且随着占空比的减小而呈现出H4型磁滞现象。在占空比为30％时，表面积增加了，而在占空比为70％时，则观察到表面积的减小和样品的晶粒尺寸减小。即使在占空比高于70％时占主导地位的H2型磁滞，在占空比小于70％时仍可获得H4型和H2型磁滞回线的交叠。开启和关闭时间的被动层。

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