Showing papers in "Electrochemistry Communications in 2007"

TL;DR: In this article, the authors showed that using a phosphate buffer to increase solution conductivity and ammonia gas treatment of a carbon cloth anode substantially increased the surface charge of the electrode (from 0.38 to 3.99 MEqm −2 ) and improved MFC performance.

TL;DR: In this paper, a LiNbO3 layer of nanometer thickness was interposed between LiCoO2 and sulfide solid electrolyte as buffer layer, which greatly reduced the interfacial resistance in the cathode and enhanced the high-rate capabilities of solid-state lithium batteries.

TL;DR: In this article, the Pd supported on carbon microspheres has excellent electrocatalytic properties and may be of great potential in direct ethanol fuel cells, but it is well known that palladium is not a good electrocatalyst for methanol oxidation.

TL;DR: Hard carbon spherule (HCS) was used as a counter electrode for dye-sensitized solar cells in this paper, and the overall conversion efficiency reached 5.7%, which was comparable to 6.5% of the counter electrode of platinum-sputtered fluorine-doped tin oxide used in Gratzel-type solar cells under the same experimental condition.

TL;DR: In this article, a galvanic replacement reaction between the porous Cu sacrificial templates and KAu(CN) 2 in solution was performed to remove the remaining Cu from the porous Au films.

TL;DR: In this article, it was shown that in LiFePO4-based cathode materials, the electrode resistance depends solely on the mean particle size and the effect of carbon coating is marginal, it suffices that each particle is point-contacted with a reasonable number of carbon black particles usually added in the course of electrode preparation.

TL;DR: A new group of room temperature ionic liquids based on triethylalkylphosphonium cations together with a bis(trifluoromethylsulfonyl)imide anion as a novel electrolyte is presented in this paper.

TL;DR: In this paper, the authors show that transition metal oxides with composite xLi2MnO3·(1−−x)LiMO2 rocksalt structures (Mn, Ni, Co) are of interest as a new generation of cathode materials for high energy density lithium-ion batteries.

TL;DR: In this article, the physical properties of the as-synthesized samples were investigated by X-ray diffraction and transmission electron microscopic, and the results showed that the Ag additive decreased the polarization of anode, and marvelously improved the high-rate discharge capacity and cycling stability of TiO 2 nanotubes.

TL;DR: In this article, a high specific capacitance was obtained for α-Co(OH) 2 potentiostatically deposited onto a stainless-steel electrode in 0.1 M Co(NO 3 ) 2 electrolyte at −1.0 V vs. Ag/AgCl.

TL;DR: In this paper, the ionic liquid (IL) 1-methyl-1-propylpiperidinium bis(trifluoromethylsuphonil)imide was used as an anode material for rechargeable Li batteries.

TL;DR: In this article, the authors reported the biosynthesis of gold nanoparticles assisted by Escherichia coli DH5α and its application on direct electrochemistry of hemoglobin, which can be achieved by incorporated into the bio-nanocomposite films on a glassy carbon electrode.

TL;DR: In this article, a surface-modified cathode material was obtained by coating it with a nano layer of amorphous carbon, and the carbon-coated LiCoO2 was characterized by X-ray diffraction analysis, scanning electron microscopy, transmission electronic microscopy and measurement of charge/discharge behavior.

TL;DR: In this article, the performance of a new type of electrochemical supercapacitor cobalt sulfide (CoSx) has been studied for the first time, and the results show that CoSx has excellent electrochemical capacitive characteristic with potential range -0.3 similar to 0.35 V (versus SCE).

TL;DR: In this article, a nanoporous nickel hydroxide film has been successfully electrodeposited on titanium substrate from nickel nitrate dissolved in the aqueous domains of the hexagonal lyotropic liquid crystalline phase of Brij 56.

TL;DR: In this paper, a kind of mesoporous carbon spheres (MCS) containing in-frame incorporated nitrogen has been prepared by a facile polymerization-induced colloid aggregation method.

TL;DR: In this article, the structural and electronic properties of Li 4 Ti 5 O 12 spinel are studied from density functional theory based first principles calculations, and the optimized lattice constant of the spinel is 8.619 A, which is even a little larger (0.2%) than 8.604 A of the lithiated state Li 7 Ti 5O 12.

TL;DR: In this article, a series of composites with a comparable texture but variable N content ranging from 7 to 20 W% have been obtained without any activation process, and detailed analysis of physicochemical properties of composite has been performed and correlated with supercapacitor characteristics.

TL;DR: In this article, a series of lithium-manganese-nickel-oxide compositions are represented in three-component notation, xLi[Mn1.5Ni0.5]O4, and two layered components, Li2MnO3 and Li(Mn 0.5 Ni0.4)O2, are structurally integrated in a highly complex manner, have been evaluated as electrodes in lithium cells for x = 1, 0.75, 0,50, 0.,25 and 0.1

TL;DR: In this article, it was shown that Pd nanoparticles dispersed well on Ti were successfully prepared by the electrodeposition method used in this study and Pd has no activity for ethanol oxidization in acid media and is a good electrocatalyst for ethanol oxidation in alkaline media when the OH− concentration is greater than 0.001 m.

TL;DR: In this paper, the electrochemical properties of ordered mesoporous carbons (OMC), synthesized by templating SBA-15 mesoporic silica materials and the electrocatalytic behaviors of OMC modified electrode towards the oxidation of dopamine (DA) and ascorbic acid (AA) were studied.

TL;DR: In this article, it was shown that only the outer surface of the oxide electrode participates in the oxygen evolution reaction, which is an indication that the IrO 2 layers participate in the reaction in acid media at least to a several monolayer extend.

TL;DR: In this article, rutile type TiO2 nanoparticles (10 nm · 200 nm in size) were prepared using a precipitation method in aqueous solution and their lithium reactivities were followed using both classical galvanostatic insertion and in situ XRD measurements, and compared to that of a bulk and commercial nano-sized (50 nm) rutilesite sample so as to stress the interlink between Li insertion electrochemical capacity and crystallite size.

TL;DR: In this paper, anodization of Ti foil in anhydrous ethylene glycol + 0.2 wt% NH4F solution (EG solution) with 0-1.0 Wt% water additions were carried out at 20 V for 45 min in a dry-argon filled controlled-atmosphere glove box.

TL;DR: In this article, a carbon supported bimetallic Au-Pd catalysts with the core-shell structure were prepared by the successive reduction method, and the electrochemical tests (cyclic voltammetry (CV) and chronoamperometry (CA)) showed that the coreshell structure could significantly improve the catalytic activity and stability of Pd in the room temperature electrooxidation of formic acid.

TL;DR: Sodium/sulfur (Na/S) batteries were assembled with a sodium metal anode, liquid electrolyte and a sulfur composite cathode as mentioned in this paper, and their electrochemical characteristics have been investigated at room temperature.

TL;DR: In this paper, a network composite cathode was prepared by mixing LiFePO4 particles with multiwalled carbon nanotubes for high rate capability, which can improve electron transport and electrochemical activity effectively.

TL;DR: In this paper, a single flow Zn/NiOOH battery is proposed, where the negative electrode is inert metal such as nickel foil, and the positive electrode is nickel oxide for secondary alkaline batteries.

TL;DR: In this paper, in situ polymerization of polypyrrole on carbon nanotubes in 01-M HCl containing (NH 4 )S 2 O 8 as oxidizing agent over a temperature range of 0-5°C Pt nanoparticles are deposited on PPy-CNT composite films by chemical reduction of H 2 PtCl 6 using HCHO as reducing agent at pH = pH 11 [Pt/PPy−CNT].