http://13.232.72.61:8080/jspui/handle/123456789/497 Wed, 24 Dec 2025 16:14:21 GMT 2025-12-24T16:14:21Z http://13.232.72.61:8080/jspui/handle/123456789/2267 Title: A Vitamin C Fuel Cell with a Non-bonded Cathodic Interface Authors: Devendrachari, Mruthyunjayachari Chattanahalli; Thimmappa, Ravikumar; Bhat, Zahid Manzoor; Shafi, Shahid Pottachola; Kotresh, Harish Makri Nimbegond; Kottaichamy, Alagar Raja; Venugopala Reddy, Kallam Ramareddy; Thotiyl, Musthafa Ottakam Abstract: Vitamin C is a naturally occurring molecule with antioxidant properties often playing pivotal role in many chemical and biochemical processes. We show that a cobalt based molecular electrocatalyst can mediate the electron donation from vitamin C that on coupling with a non-bonded and reversible electron acceptor, the electron flow between the half cells can be channeled in a precious metal free configuration. The non-bonded nature of the electron acceptor allowed fast interfacial kinetics even on simple carbon particles and arrested the cathode derived parasitic chemistry often encountered with molecular oxygen, the conventional electron acceptor in fuel cells. Consequently, the vitamin C fuel cell driven by non-bonded cathodic interface demonstrated performance metrics ∼18 times higher than precious metal based vitamin C-O2 configuration. The renewable nature of the fuel and the precious metal free configuration in proposed nonbonded architecture noticeably reduce the cost of electricity per kW with potential practical applications for powering commercial electrical-appliances Fri, 01 Jun 2018 00:00:00 GMT http://13.232.72.61:8080/jspui/handle/123456789/2267 2018-06-01T00:00:00Z http://13.232.72.61:8080/jspui/handle/123456789/2237 Title: A Proton Exchange Membrane Fuel Cell with a Pt-Free Cathode and a Freely Diffusing Electron Acceptor Authors: Thimmappa, Ravikumar; Kottaichamy, Alagar Raja; Devendrachari, Mruthyunjayachari Chattanahalli; Aralekallu, Shambulinga; Shafi, Shahid Pottachola; Gautam, Manu; Kotresh, Harish Makri Nimbegondi; Thotiyl, Musthafa Ottakam Abstract: In a fuel cell almost 80% efficiency loss arises due to the cathode, consequently the cathode requires the largest amount of precious metal catalyst. Here we show a precious-metal-free cathode for a proton exchange membrane fuel cell (PEMFC) containing only carbon nanoparticles as catalyst and a freely diffusing molecule as electron acceptor. Factors controlling the true rate of electrochemical reactions are amplified just with carbon nanoparticles leading to a carbon corrosion free PEMFC delivering 154 mW/cm2 at 358 mA/cm2 without any precious metals Thu, 01 Dec 2016 00:00:00 GMT http://13.232.72.61:8080/jspui/handle/123456789/2237 2016-12-01T00:00:00Z http://13.232.72.61:8080/jspui/handle/123456789/2233 Title: Kinetics and Mechanistic Studies on Oxidation of Levocarnitine by Bromamine-T in HCl Medium Catalyzed by Ru(III) Authors: Ramachandrappa, R.; Iyengar, Pushpa; Joseph, Usha Abstract: A kinetic study on RuCl3-catalysed oxidation of levocarnitine (LC) by sodium N-bromo-p-toluenesulphonamide or bromamine-T (BAT) has been carried out in HCl medium at 303 K. The reaction rate shows a 􀄕rst order dependence on [BAT]0 and fractional order with respect to both [LC]0 and [H+]. Addition of the reaction product, p-toluenesulphonamide, retards the rate. e addition of RuCl3 and chloride ions to the reaction mixture shows an increase in the rate of the reaction. e dielectric effect is positive. e variation of ionic strength of the medium has no signi􀄕cant effect on the rate of the reaction. e reaction fails to initiate polymerization of acrylamide. Michaelis-Menten type of kinetics has been proposed. ermodynamic parameters have been computed from Arrhenius plot by studying the reaction at different temperatures.The reaction stoichiometry and oxidation products were identi􀄕ed. Based on the experimental observations a suitable mechanism was proposed and rate law deduced. Mon, 01 Oct 2012 00:00:00 GMT http://13.232.72.61:8080/jspui/handle/123456789/2233 2012-10-01T00:00:00Z http://13.232.72.61:8080/jspui/handle/123456789/915 Title: DNA Binding and Cleavage Studies of Cobalt Complexes Containing Bioactive Mixed Ligands. Authors: Sreekanth, B.; Krishnamurthy, G.; Naik, H. S. Bhojya; Vishnuvardhan, T. K.; Lokesh, M. R. Abstract: The complexes containing bioactive ligand of the type [Co(L1L2)] (PF6)2 complex (1) (where L1=1,10-phenanthroline and L2 = N,N-dimethyl-2-{5-[(pyrrolidin-1-ylsulfonyl)methyl]-1H-indol-3-yl}ethanamine (almotriptan) in 1:1 molar ratio of ligands) and [Co(L1L3L4)] (PF6)2 complex (2) (where L3=4H-1,2,4-triazol-4-amine, L4=1H-benzimidazole-2-thiol and the ligands are in the ratio 1:1:1, were synthesized and characterized. The DNA binding property of the complexes with calf thymus DNA has been investigated using absorption spectra, viscosity measurements and thermal denaturation experiments. The intrinsic binding constant Kb has been estimated at room temperature. The absorption spectral studies indicate that the complexes intercalate between the base pairs of the CT-DNA tightly with intrinsic DNA binding constant of 2.4 × 106 M−1 for (1) and 3.3 × 104 M−1 for (2) in 5 mM Tris-HCl/50 mM NaCl buffer at pH 7.2, respectively. The oxidative cleavage activity of (1), and (2) upon pUC19 DNA were studied by using gel electrophoresis and the results show that complexes have potent nuclease activity. Wed, 01 Jan 2014 00:00:00 GMT http://13.232.72.61:8080/jspui/handle/123456789/915 2014-01-01T00:00:00Z