Cellule galvanique

Résumé

Une cellule galvanique, nommée d'après Luigi Galvani, ou cellule voltaïque, nommé d'après Alessandro Volta, est un dispositif convertissant spontanément une substance chimique en énergie électrique. Voir aussi

Capteur d'humidité du sol
Galvanisme

Notes et références Catégorie:Électrochimie

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Quantifying electrochemical promotion of induced bipolar Pt particles supported on YSZ

Christos Comninellis, Wolfgang Harbich, Michael Hugentobler, Yuehui Li, Chun Xia

Electrochemical promotion (EP) of CO oxidation is shown for the first time on induced bipolar Pt particles supported on yttria-stabilized zirconia (YSZ). These Pt particles are formed by sputter deposition of high-purity Pt metal followed by sintering. Conditions were chosen to stay below the percolation threshold of Pt particles. In-plane polarization of Pt particles results in a bipolar system and leads to the formation of a large number of galvanic cells partially or completely polarized. We have defined an equivalent number of active cells (n cell) which has been estimated from the oxygen evolution reaction as a function of the applied current on the two feed electrodes. The CO oxidation rate is measured under high vacuum conditions as a function of applied current. The use of isotopically labeled oxygen allows the discrimination of the faradaic process (16O from YSZ) from the non-faradaic process (18O from18O2) and to determine the faradaic efficiency (Λ) and the rate enhancement (ρ) parameters in this bipolar system. These results mark an important step in the realization of electrochemical promotion on highly dispersed catalysts. © 2010.

Elsevier2010

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Correspondence "Origin of the magneto–thermogalvanic voltage in cluster-assembled metallic nanostructures"

Jean-Pierre Abid, Jean-Philippe Ansermet, Giulia Di Domenicantonio, Santiago Serrano Guisan

2008

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Infrared thermography is a powerful tool to investigate the dynamic evolution of temperature in chemical reactions. The CO2 hydrogenation reaction is an ideal model reaction to assess the presented technique due to its high exothermicity. Various dynamic experiments are performed in a newly designed reaction cell with an infrared transmitting ZnSe window. In particular, the gas exchange reactions between CO2 and H-2, the coinjection of the two reactants, and the study of the effect of inert gas addition are investigated. Here, we show that the reaction rate on the surface of a catalyst can be localized in time and space by means of infrared thermography. This opens the way to the precise description of reaction dynamics, in particular for reactions operating in intermitting conditions. Furthermore, we show that the combination of infrared thermography with other analytic techniques such as rapid and quantitative mass spectrometry enables a holistic understanding of the transient reaction phenomena.

AMER CHEMICAL SOC2020

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