Minakshi, Manickam - Murdoch University - School of Engineering and Information Technology

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Minakshi, Manickam Dr 收藏完善纠错
Murdoch University School of Engineering and Information Technology
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研究领域

(a) Modified electrodes / electrolyte bath for hydrogen / oxygen generation Hydrogen plays an important role in the energy sector as a fuel for transportation. However, electrolytic hydrogen generation is energy intensive and the means to save energy have been widely studied. We focus in developing inexpensive alternative anode materials for oxygen generation in order to substitute expensive conventional anodes such as dimensionally stable anodes (DSA). The geometric and electronic factors of the starting “electrolytic manganese dioxide (EMD) material”, Raney Nickel, and Raney Cobalt have been altered to enhance the electrochemical activity toward the oxygen evolution reaction. We are also working on modified Watts bath for Raney Ni electrode deposition while using porous electrodes and substituting expensive reagents with less costly ones. We have observed competitive over potentials for the hydrogen evolution reaction from porous deposited in modified Watts bath. The presence of certain dopants in the bath, lowers the efficiency of the electrode surface. Less efficiency means increasing the over potential for the hydrogen evolution reaction on Raney Ni based electrodes. (b) Solid polymer electrolyte for energy storage devices Aqueous and non-aqueous electrolytes are widely used in electronic (battery like) devices but have numerous limitations such as volatility, flammability and leakage. Therefore, we have developed all solid state capacitor and used polymer electrodes and electrolyte as the host. Solid polymer electrolytes (SPEs) are emerging as a new class of technologically important materials suitable for energy storage devices. Our objective is to synthesize a novel polymer electrode incorporating high surface area of activated carbon (AC) and to evaluate its suitable proposition in the host polymer matrix (70PEO:30 AgI). PEO denotes polyethylene oxide that exhibiting excellent conductivity, ion transport number and activation energy a pre-requisite for solid state electrochemical devices The presence of activated carbon not only improves the conductivity of the matrix but also solving the transportation of ions into the active sites. The new conceptual idea of using activated carbon is due to its high surface area and amorphous in nature. An increase in amorphosity of the polymer matrix may result in higher ionic conductivity because it is widely agreed that the ionic conduction in the amorphous phase is much greater than that of the crystalline part. (c) Electrodeposition of electrolytic manganese dioxide (EMD): Role of anionic, cationic and non-anionic surfactants Surfactants play a significant role in modifying the growth pattern of MnO2 through adsorption on its surface during electrodeposition. Adsorption of surfactants on the surface influences the kinetics of electron transfer through blocking of active sites, and also affects electrostatic interactions between electro active species in the electrolytic bath. Consequently, addition of organic surfactants to the electrolytic bath affects the morphology and mechanical properties of electrochemically deposited material, leading to altered electrochemical behaviour of materials. We have observed that addition of suitable amount of surfactants changed the deposited morphologies, reduced the MnO2 particle size, and increased its specific surface area as well as the electrochemical behaviour of the MnO2 samples. Eventually, by tailoring the suitable and appropriate amounts of surfactants, improved storage behaviour can be achieved both in battery or capacitor like devices. (d) Mechanism of the incorporation of lead into copper cathodes We are investigating the factors which contribute to the incorporation of lead into cathodes produced under conditions which simulate plant practice in the electrowinning of copper. Small scale (laboratory) test work has been shown that the main source of lead contamination is from particles of lead sulfate and lead dioxide produced by spalling of the corrosion layers on the lead alloy anodes. Lead dioxide particles are incorporated to a greater extent than lead sulfate. The extent of contamination was found to be very significantly reduced in the presence of chloride ions in the electrolyte while the presence of smoothing agents such as guar or galactosol results in smaller reductions in contamination. The use of secondary ion mass spectrometry (SIMS) has enabled the distribution of lead and sulphur in the cathodes to be quantitatively studied. Our results showed that lead is concentrated in the outer surface layers (within 50 mm of the surface) of the cathodes. A possible mechanism for this observation is underway.

近期论文

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Ramkumar, R., Minakshi Sundaram, M., (2016), A biopolymer gel-decorated cobalt molybdatenanowafer: effective graft polymer cross-linkedwith an organic acid for better energy storage, New Journal of Chemistry, 40, 3, pages 2863 - 2877. Minakshi Sundaram, M., Biswal, A., Mitchell, D., Jones, R., Fernandez, C., (2016), Correlation among physical and electrochemicalbehaviour of nanostructured electrolyticmanganese dioxide from leach liquor andsynthetic for aqueous asymmetric capacitor, Physical Chemistry Chemical Physics, 18, 6, pages 4711 - 4720. Minakshi Sundaram, M., Mitchell, D., Jones, R., Alenazey, F., Teeraphat, W., Chakraborty, S., Ahuja, R., (2016), Synthesis, structural and electrochemicalproperties of sodium nickel phosphate for energystorage devices, Nanoscale, 8, , pages 11291 - 11305. Ramkumar, R., Minakshi Sundaram, M., (2016), Electrochemical synthesis of polyaniline crosslinkedNiMoO4 nanofibre dendrites for energy storage devices, New Journal of Chemistry, DOI: 10.1039/c6nj00521g, , pages -. Biswal, A., Minakshi Sundaram, M., Tripathy, B., (2016), Probing the electrochemical properties of biopolymer modified EMD nanoflakes through electrodeposition for high performance alkaline batteries, Dalton Transactions: the international journal for inorganic, organometallic and bioinorganic chemistry, 45, 13, pages 5557 - 5567. Biswal, A., Tripathy, B., Sanjay, K., Subbaiah, T., Minakshi Sundaram, M., (2015), Electrolytic manganese dioxide (EMD): a perspective on worldwide production, reserves and its role in electrochemistry, RSC Advances, 5, , pages 58255 - 58283. Baral, A., Dash, T., Ghosh, M., Subbaiah, T., Minakshi Sundaram, M., (2015), Pathway of Sucrose Oxidation in Manganese (Pyrolusite) Nodule, Industrial & Engineering Chemistry Research, 54, , pages 12233 - 12241. Ramkumar, R., Minakshi Sundaram, M., (2015), Fabrication of ultrathin CoMoO4 nanosheets modified with chitosan and their improved performance in energy storage device, Dalton Transactions: the international journal for inorganic, organometallic and bioinorganic chemistry, 44, 13, pages 6158 - 6168. Tirupathi Rao, P., Shivakumara, S., Minakshi Sundaram, M., Munichandraiah, N., (2015), Porous Flower-like a-Fe2O3 Nanostructure: A High Performance Anode Material for Lithium-ion Batteries, Electrochimica Acta, 167, , pages 330 - 339. Minakshi Sundaram, M., Teeraphat, W., Chakraborty, S., Ahuja, R., Duraisamy, S., Tirupathi Rao, P., Munichandraiah, N., (2015), Synthesis, and crystal and electronic structure ofsodium metal phosphate for use as a hybridcapacitor in non-aqueous electrolyte, Dalton Transactions: the international journal for inorganic, organometallic and bioinorganic chemistry, 44, 46, pages 20108 - 20120. Senthilkumar, B., Kalai Selvan, R., Meyrick, D., Minakshi Sundaram, M., (2015), Synthesis and Characterization of Manganese Molybdate for Symmetric Capacitor Applications, International Journal of Electrochemical Science, 10, 1, pages 185 - 193. Delgado Aguilar, D., Minakshi Sundaram, M., Kim, D., (2015), Electrochemical Impedance Spectroscopy Studies on Hydrogen Evolution from Porous Raney Cobalt in Alkaline Solution, International Journal of Electrochemical Science, 10, , pages 9379 - 9394. Singh, N., Verma, M., Minakshi Sundaram, M., (2015), PEO nanocomposite polymer electrolyte for solid state symmetric capacitors, Bulletin of Materials Science, 38, 6, pages 1577 - 1588. Delgado Aguilar, D., Minakshi Sundaram, M., Senanayake, G., Kim, D., (2015), Modified electrolytic manganese dioxide (MEMD) for oxygen generation in alkaline medium, Journal of Solid State Electrochemistry: current research and development in science and technology, 19, 4, pages 1133 - 1142. Biswal, A., Tripathy, B., Subbaiah, T., Meyrick, D., Minakshi Sundaram, M., (2015), Dual Effect of Anionic Surfactants in the Electrodeposited MnO2 Trafficking Redox Ions for Energy Storage, Electrochemical Society. Journal, 162, 1, pages A30 - A38. Delgado Aguilar, D., Minakshi Sundaram, M., McGinnity, J., Kim, D., (2015), Co/Mo bimetallic addition to electrolytic manganese dioxide for oxygen generation in acid medium (IN PRESS), Scientific Reports, 5, DOI: 10.1038/srep15208, pages 15208 -. Baskar, S., Meyrick, D., Kalai Selvan, R., Minakshi Sundaram, M., (2014), Facile and large scale combustion synthesis of -CoMoO4: Mimics the redox behavior of a battery in aqueous hybrid device, Chemical Engineering Journal, 253, , pages 502 - 507. Baskar, S., Kalai Selvan, R., Vasylechko, L., Minakshi Sundaram, M., (2014), Synthesis, crystal structure and pseudocapacitor electrode properties of g-Bi2MoO6 nanoplates, Solid State Sciences, 35, , pages 18 - 27. Verma, M., Minakshi Sundaram, M., Singh, N., (2014), Synthesis and Characterization of Solid Polymer Electrolyte based on Activated Carbon for Solid State Capacitor, Electrochimica Acta, 137, , pages 497 - 503. Verma, M., Minakshi Sundaram, M., Singh, N., (2014), Structural and Electrochemical Properties of Nanocomposite Polymer Electrolyte for Electrochemical Devices, Industrial & Engineering Chemistry Research, 53, 39, pages 14993 - 15001.

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