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RISS 인기검색어
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- 저자 : Tulasivarma, C.V. (검색결과 2 건)
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Durga, I.,Rao, S. S.,Punnoose, D.,Kundakarla, N.,Tulasivarma, C.,Kim, H. J. Royal Society of Chemistry 2017 New journal of chemistry Vol.41 No.5
<P>A novel approach for the synthesis of CoxNiyS nanoparticles on fluorine-doped tin oxide (FTO) and nickel-foam (Ni-foam) substrates for methanol oxidation in alkaline media is described. The introduced electrocatalyst was synthesized using different concentrations of cobalt (Co) and nickel (Ni) via a simple and effective process; the electrochemical properties were assessed by cyclic voltammetry. The Co90%Ni10% catalyst showed a current density of -0.576 and -0.801 mA on FTO and Ni-foam, respectively, which is the best for the oxygen reduction reaction. The observed electrocatalytic activity proves that the Ni content plays a crucial role in the enhanced current density. Co90%Ni10% also showed superior stability; 78.75% of the electroactive area remained compared to 67.31% in the case of Co0%Ni100% on Ni-foam. Moreover, the optimized catalyst was used as a counter electrode (CE) in quantum-dot sensitized solar cells and showed greater catalytic activity in a polysulfide redox electrolyte than CuS and Pt based CEs. As a result, under 1 sun illumination, Co90%Ni10% exhibited a power conversion efficiency of up to 2.89%, which was much higher than that of the Pt (1.32%) and CuS (2.03%) CEs. The power conversion efficiency of Co90%Ni10% was enhanced by the surface morphology, roughness factor, and current density, which permit prompt electron transport and lower the charge transfer resistance rate for the polysulfide redox electrolyte.</P>
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Kim, H.J.,Suh, S.M.,Rao, S.S.,Punnoose, D.,Tulasivarma, C.V.,Gopi, Chandu.V.V.M.,Kundakarla, N.,Ravi, S.,Durga, I.K. Elsevier Sequoia 2016 Journal of Electroanalytical Chemistry Vol.777 No.-
<P>To make quantum dot-sensitized solar cells (QDSSCs) more attractive, it is necessary for the power conversion efficiency (PCE) to be comparable to those of other emerging solar cells. Currently, copper sulfide (CuS) and nickel sulfide (NiS) are commonly used counter electrodes (CEs) in high-efficiency QDSSCs because of their low toxicity, environmental compatibility, and superior electrocatalytic activity in the presence of polysulfide electrolyte. For the first time, novel CuS/NiS electrodes were prepared by facile chemical bath deposition method. This article describes the effect of NiS layer on CuS film for preventing the recombination process to enhance the performance of QDSSCs. Under one sun illumination, the CE with the optimized CuS/NiS composite film exhibits higher short-circuit current density (J(sc)), open-circuit voltage (V-oc), and PCE of 12.47 mA cm(-2), 0.599 V, and 4.19%, respectively. These values are much higher than those of bare CuS (2.73%), NiS (1.82%), and Pt CEs (1.16%). This enhancement is mainly attributed to the improved surface morphology, higher sulfur atomic percentage with Cu vacancies, rapid electron transport, and lower electron recombination rate for the polysulfide electrolyte. Characterization with, cyclic voltammetry, and Tafel polarization was performed to study the reasons for efficient CE performance. (C) 2016 Elsevier B.V. All rights reserved.</P>
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