Nano Archive

Nano-structural tailoring of manganese dioxide by using pulse current electrodeposition

Adelkhani, Hadi and Ghaemi, Mehdi (2008) Nano-structural tailoring of manganese dioxide by using pulse current electrodeposition. Solid State Ionics, 179 (39). 2278-2283 .

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Official URL: http://www.sciencedirect.com/science?_ob=ArticleUR...

Abstract

A pulse current technique has been applied for the preparation of Manganese Dioxides (PCMD) in an additive-free MnSO4–H2SO4 solution. The influence of pulse current parameters on surface characteristics has been studied by using scanning electron microscopy (SEM). Pore size distribution (PSD) of samples is determined from the desorption isotherm according to the Barrett–Joyner–Halenda (BJH) model. The subsequent effects on charge discharge cycle performance of deposited materials have been studied in laboratory designed RAM batteries. SEM images confirmed a decrease in PCMDs surface roughness showing more coherent and cracks-free deposits compares to a sample, which is deposited by direct current (DCMD). Results show that under optimized pulse condition, PSD data in PCMD is narrower and less than 3 nm, whereas DCMD exhibits a boarder pore size distribution and larger pore volume. Grain size, pore size distribution and pore volume were established to be important factors determining electrochemical behavior of deposited materials. Results of RAM batteries revealed that the cycle life of batteries made of PCMDs were rather higher than that made by conventional DCMD. Functional improvements are mainly attributed to enhanced current distribution as well as fewer amounts of incorporated water molecules into the PCMD crystal lattice. These could be considered as a result of lower accumulation of passive intermediates and a lower anodic overvoltage during electrodeposition of PCMD. Depending on the applied pulse parameters, nano-tailoring of PCMDs in different morphological varieties is possible.

Item Type:Article
Subjects:Physical Science > Nanophysics
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:7316
Deposited By:JNCASR
Deposited On:28 Oct 2009 09:40
Last Modified:28 Oct 2009 09:40

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