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L. Ciríaco - One of the best experts on this subject based on the ideXlab platform.
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The Oxygen Evolution Reaction at Sn-Sb Oxide Anodes: Influence of the Oxide Preparation Mode
Journal of the Electrochemical Society, 2014Co-Authors: D. Santos, M. J. Pacheco, A Lopes, A. Gomes, L. CiríacoAbstract:Stannous and antimony oxide electrodes were prepared by metallic Electrodeposition followed by thermal oxidation. For the metal deposition, two methodologies were tested: alternate and simultaneous Sn and Sb Electrodepositions. Metals were deposited onto titanium foil or titanium foil coveredwith platinum or copper. For both preparationmethods, the SnO2 crystalline phasewas identified, with Sb2O3 or Sb 2O4 only present when alternate Sn and Sb Electrodepositions were performed. The roughness factor depends on the Electrodeposition method and on the substrate morphology. The introduction of a Pt or Cu metallic interlayer increases the current intensity for equal applied potential due to the increases in the substrates' conductivity and real surface area. The presence of composite Sn and Sb oxides leads to lower current intensity because the existence of distinct phases introduces resistance in the grain boundaries. Concerning the apparent activation energy for the oxygen evolution reaction, values of 73, 74 and 63 kJ mol-1 were found for Ti/Pt/SnO2-Sb, Ti/Cu/SnO2-Sb and Ti/Cu/SnO 2-Sb2O3, respectively, pointing to HO - adsorption as the rate determining step at these electrodes' surfaces. For Ti/SnO2-Sb, Ti/SnO2-Sb2O 4 and Ti/Pt/SnO2-Sb2O4, much higher apparent activation energies were obtained. Of the tested materials, the most appropriate for oxygen evolution is Ti/Cu/SnO2-Sb. © 2014 The Electrochemical Society. All rights reserved.
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Preparation of Ti/Pt/SnO_2–Sb_2O_4 electrodes for anodic oxidation of pharmaceutical drugs
Journal of Applied Electrochemistry, 2013Co-Authors: D. Santos, M. J. Pacheco, A Lopes, A. Gomes, L. CiríacoAbstract:Ti/Pt/SnO_2–Sb_2O_4 electrodes were prepared by alternating Sn and Sb Electrodepositions, repeated 4 or 16 times, onto a platinized titanium foil by a thermo-electrochemical method. Chemical, electrochemical, and structural tests have been used for the characterization of Ti/Pt/SnO_2–Sb_2O_4 electrodes. Anodic oxidation of the aqueous solution contaminated by amoxicillin, clofibric acid, diclofenac, and ibuprofen having a concentration of 100 mg L^−1 and 0.035 M of Na_2SO_4 have been applied using Ti/Pt/SnO_2–Sb_2O_4 electrodes at a current density of 10 and 30 mA cm^−2. The chemical oxygen demand removals increased with current density and except for diclofenac, the Ti/Pt/SnO_2–Sb_2O_4 electrode with 4 Electrodeposition repetitions gave the best results. The combustion efficiencies for diclofenac and ibuprofen were higher than those obtained with similar electrode material, prepared without platinization, especially in the assay run with Ti/Pt/SnO_2–Sb_2O_4 (16 Electrodeposition repetitions).
Daniel R Gamelin - One of the best experts on this subject based on the ideXlab platform.
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photo assisted Electrodeposition of cobalt phosphate co pi catalyst on hematite photoanodes for solar water oxidation
Energy and Environmental Science, 2011Co-Authors: Diane K Zhong, Maurin Cornuz, Kevin Sivula, Michael Gratzel, Daniel R GamelinAbstract:A photo-assisted Electrodeposition approach was used to deposit a cobalt–phosphate water oxidation catalyst (“Co–Pi”) onto recently improved dendritic mesostructures of α-Fe2O3. A comparison between this approach, Electrodeposition of Co–Pi, and Co2+ wet impregnation showed that photo-assisted Electrodeposition of Co–Pi yields superior α-Fe2O3 photoanodes for photoelectrochemical water oxidation. Stable photocurrent densities of 1.0 mA cm−2 at 1.0 V and 2.8 mA cm−2 at 1.23 V vs. RHE measured under standard illumination and basic conditions were achieved. By allowing deposition only where visible light generates oxidizing equivalents, photo-assisted Electrodeposition provides a more uniform distribution of Co–Pi onto α-Fe2O3 than obtained by Electrodeposition. This approach of fabricating catalyst-modified metal-oxide photoelectrodes may be attractive for optimization in conjunction with tandem or hybrid photoelectrochemical cells.
C.h. De Groot - One of the best experts on this subject based on the ideXlab platform.
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Electrodeposition of Ni-Si Schottky barriers
2005 IEEE International Magnetics Conference (INTERMAG), 2005Co-Authors: M.e. Kiziroglou, A.a. Zhukov, M. Abdelsalam, Xiaoli Li, P.a.j. De Groot, N. Bartlett, C.h. De GrootAbstract:Data on electrodeposited Ni on Si for different Si substrate resistivities is presented. It is shown that the Schottky barriers formed are of high quality with low ideality factor and very small reversed leakage. The versatility of Electrodeposition on Si has been demonstrated. Size dependence and edge effects are discussed, both for the Electrodeposition process and the electrical properties. It is also shown that Electrodeposition on Si can be used on high resistivity substrates without back contact.
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Electrodeposition of Ni-Si Schottky barriers
IEEE Transactions on Magnetics, 2005Co-Authors: M.e. Kiziroglou, A.a. Zhukov, M. Abdelsalam, Xiaoli Li, P.a.j. De Groot, P.n. Bartlett, C.h. De GrootAbstract:Electrodeposition is being used to fabricate magnetic microstructures directly on patterned n-type Si wafers of various substrate resistivities. The Ni-Si Schottky barrier is characterized and found to be of high quality for relatively low Si resistivities (1-2 /spl Omega//spl middot/cm), with extremely low reverse leakage. It is shown that a direct correlation exists among the Electrodeposition potential, the roughness, and the coercivity of the films. A conductive seed layer or a back contact is not compulsory for Electrodeposition on Si with resistivities up to 15 /spl Omega//spl middot/cm. This shows that Electrodeposition of magnetic materials on Si might be a viable fabrication technique for magnetoresistance and spintronics applications.
D. Santos - One of the best experts on this subject based on the ideXlab platform.
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The Oxygen Evolution Reaction at Sn-Sb Oxide Anodes: Influence of the Oxide Preparation Mode
Journal of the Electrochemical Society, 2014Co-Authors: D. Santos, M. J. Pacheco, A Lopes, A. Gomes, L. CiríacoAbstract:Stannous and antimony oxide electrodes were prepared by metallic Electrodeposition followed by thermal oxidation. For the metal deposition, two methodologies were tested: alternate and simultaneous Sn and Sb Electrodepositions. Metals were deposited onto titanium foil or titanium foil coveredwith platinum or copper. For both preparationmethods, the SnO2 crystalline phasewas identified, with Sb2O3 or Sb 2O4 only present when alternate Sn and Sb Electrodepositions were performed. The roughness factor depends on the Electrodeposition method and on the substrate morphology. The introduction of a Pt or Cu metallic interlayer increases the current intensity for equal applied potential due to the increases in the substrates' conductivity and real surface area. The presence of composite Sn and Sb oxides leads to lower current intensity because the existence of distinct phases introduces resistance in the grain boundaries. Concerning the apparent activation energy for the oxygen evolution reaction, values of 73, 74 and 63 kJ mol-1 were found for Ti/Pt/SnO2-Sb, Ti/Cu/SnO2-Sb and Ti/Cu/SnO 2-Sb2O3, respectively, pointing to HO - adsorption as the rate determining step at these electrodes' surfaces. For Ti/SnO2-Sb, Ti/SnO2-Sb2O 4 and Ti/Pt/SnO2-Sb2O4, much higher apparent activation energies were obtained. Of the tested materials, the most appropriate for oxygen evolution is Ti/Cu/SnO2-Sb. © 2014 The Electrochemical Society. All rights reserved.
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Preparation of Ti/Pt/SnO_2–Sb_2O_4 electrodes for anodic oxidation of pharmaceutical drugs
Journal of Applied Electrochemistry, 2013Co-Authors: D. Santos, M. J. Pacheco, A Lopes, A. Gomes, L. CiríacoAbstract:Ti/Pt/SnO_2–Sb_2O_4 electrodes were prepared by alternating Sn and Sb Electrodepositions, repeated 4 or 16 times, onto a platinized titanium foil by a thermo-electrochemical method. Chemical, electrochemical, and structural tests have been used for the characterization of Ti/Pt/SnO_2–Sb_2O_4 electrodes. Anodic oxidation of the aqueous solution contaminated by amoxicillin, clofibric acid, diclofenac, and ibuprofen having a concentration of 100 mg L^−1 and 0.035 M of Na_2SO_4 have been applied using Ti/Pt/SnO_2–Sb_2O_4 electrodes at a current density of 10 and 30 mA cm^−2. The chemical oxygen demand removals increased with current density and except for diclofenac, the Ti/Pt/SnO_2–Sb_2O_4 electrode with 4 Electrodeposition repetitions gave the best results. The combustion efficiencies for diclofenac and ibuprofen were higher than those obtained with similar electrode material, prepared without platinization, especially in the assay run with Ti/Pt/SnO_2–Sb_2O_4 (16 Electrodeposition repetitions).
M. K. Pietre - One of the best experts on this subject based on the ideXlab platform.
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Electrochemical recycling of the zinc from spent Zn–MnO2 batteries
Journal of Power Sources, 2004Co-Authors: M. B. J. G. Freitas, M. K. PietreAbstract:In this work, zinc from the spent Zn–MnO2 batteries is recycled. Ionic zinc is recovered from acidic or alkaline solutions using a galvanostatic technique. An optimum current density between 10.0 and 25.0mAcm-2 was obtained for recovery of ionic zinc from acidic solutions. The optimum current density is equal to 15.0mAcm-2 for zinc Electrodeposition from alkaline solution. The charge efficiency is 80.0% and decreases with increase of current density. In acidic solutions, hydrogen adsorption catalyse Zn2+ Electrodeposition. In alkaline solutions, a parallel reaction of the hydrogen evolution inhibits zincate Electrodeposition.