Topic
Supporting electrolyte
About: Supporting electrolyte is a research topic. Over the lifetime, 5011 publications have been published within this topic receiving 104172 citations.
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TL;DR: In this paper, the Pt nanoparticles were deposited at the surface of well-aligned multi-walled carbon nanotubes (MWNTs) by potential cycling between +0.50 and −0.70 V at a scanning rate of 50 mV · s−1 in 5 mM Na2PtCl6 solution containing 0.1 M NaCl.
Abstract: Platinum (Pt) nanoparticles were deposited at the surface of well-aligned multi-walled carbon nanotubes (MWNTs) by potential cycling between +0.50 and −0.70 V at a scanning rate of 50 mV · s−1 in 5 mM Na2PtCl6 solution containing 0.1 M NaCl. The electrocatalytic oxidation of methanol at the nanocomposites of Pt nanoparticles/nanotubes (Ptnano/MWNTs) has been investigated using 0.2 M H2SO4 as supporting electrolyte. The effects of various parameters, such as Pt loading, concentration of methanol, medium temperature as well as the stability of Ptnano/MWNTs electrode, have been studied. Compared to glassy carbon electrode, carbon nanotube electrode significantly enhances the catalytic efficiency of Pt nanoparticles for methanol oxidation. This improvement in performance is due not only to the high surface area and the fast electron transfer rate of nanotubes but also to the highly dispersed Pt nanoparticles as electrocatalysts at the tips and the sidewalls of nanotubes.
54 citations
TL;DR: In this paper, the authors demonstrate that efficient DMFC electrocatalysts can be achieved by Ru deposition on carbon-supported Pt nanoparticles, and that formation of a PtRu alloy is not a required condition for effective methanol electrooxidation.
Abstract: Methanol oxidation electrocatalysts were prepared from Ru electrochemical or spontaneous deposition on commercial-grade carbon-supported Pt nanoparticles (Pt-Vulcan XC72, E-TEK). The resulting Ru coverage was estimated by cyclic voltammetry in supporting electrolyte. The maximum electrocatalytic activity for methanol oxidation at room temperature was observed at lower Ru coverage for spontaneous deposition than for electrodeposition; θRu ∼10% vs ∼20%, respectively. On the other hand, higher current densities for methanol oxidation were obtained in the case of electrodeposited Ru. These two results were related to the presence of non-reducible ruthenium oxides in the spontaneous deposit. The present work provides evidence that (i) efficient DMFC electrocatalysts can be achieved by Ru deposition on Pt nanoparticles, and (ii) formation of a PtRu alloy is not a required condition for effective methanol electrooxidation.
54 citations
TL;DR: In this paper, the use of a carbon-nanotube paste electrode for the determination of sulfamethoxazole has been investigated and a decrease of ca. 110mV in the overpotential for the oxidation was reported along with greatly enhanced signal-to-noise characteristics.
54 citations
TL;DR: In this article, the electrochemical behavior of a silver-exchanged "mordenite"-type zeolite (ZO − Ag + ) has been investigated, and it has been found that Ag + ions could be electrochemically reduced in aqueous solutions containing various supporting electrolytes according to ZO −Ag + +M′ + + e − →ZO−M′+ + +Ag(0), where M′ + represents the cation of the supporting electrolyte; M′+ =Li +, Na +, K +, Cs
53 citations
TL;DR: In this paper, the electrochemical behavior of solid copper hexacyanoferrate (powder) was investigated in the absence of contact with a liquid external supporting electrolyte, and the overall dynamics of charge transport in the material, when discussed in terms of effective diffusion, is moderately high (on the level of 10 −8 cm 2 s −1 ).
53 citations