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Electrochemical promotion in catalysis: non-faradaic electrochemical modification of catalytic activity

Vayenas, Constantinos G, Ladas S., Bebelis, Symeon, Gentekakis Ioannis, Neophytides, S. G, Jiang Yi, Karavasilis Ch., Pliangos C.

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URIhttp://purl.tuc.gr/dl/dias/AA23BBE7-4D6E-426F-A026-63ED5F8F2182-
Αναγνωριστικόhttp://www.sciencedirect.com/science/article/pii/0013468694851743-
Αναγνωριστικόhttps://doi.org/10.1016/0013-4686(94)85174-3-
Γλώσσαen-
Μέγεθος7 pagesen
ΤίτλοςElectrochemical promotion in catalysis: non-faradaic electrochemical modification of catalytic activityen
ΔημιουργόςVayenas, Constantinos Gen
ΔημιουργόςLadas S.en
ΔημιουργόςBebelis, Symeonen
ΔημιουργόςGentekakis Ioannisen
ΔημιουργόςΓεντεκακης Ιωαννηςel
ΔημιουργόςNeophytides, S. Gen
Δημιουργός Jiang Yien
ΔημιουργόςKaravasilis Ch.en
ΔημιουργόςPliangos C.en
ΕκδότηςElsevieren
ΠερίληψηThe catalytic activity and selectivity of the gas-exposed electrode surface of metal electrodes in solid electrolyte cells is altered dramatically and reversibly upon polarizing the metal—solid electrolyte interface. The induced steady-state change in catalytic rate can be up to 9000% higher than the normal (open-circuit) catalytic rate and up to 3 × 105 higher than the steady-state rate of ion supply. This new effect of non-faradaic electrochemical modification of catalytic activity (NEMCA) has been already demonstrated for more than 30 catalytic reactions on Pt, Pd, Rh, Ag, Au and Ni surface by using O2−, F−, Na+ and H+ conducting solid electrolytes. There is also a recent demonstration for an aqueous electrolyte system. In this paper the common features of previous NEMCA studies are summarized and the origin of the effect is discussed in light of recent in situ work function and XPS measurements which showed that: (1) solid electrolyte cells with metal electrodes are work function probes and work function controllers, via potential application, for their gas-exposed electrode surfaces; and (2) NEMCA is due to an electrochemically driven and controlled spillover of ions from the solid electrolyte onto the gas-exposed electrode surface. These spillover ions establish an effective electrochemical double layer and act as promoters for catalytic reactions. This interfacing of electrochemistry and catalysis offers several exciting theoretical and technological possibilities.en
ΤύποςPeer-Reviewed Journal Publicationen
ΤύποςΔημοσίευση σε Περιοδικό με Κριτέςel
Άδεια Χρήσηςhttp://creativecommons.org/licenses/by/4.0/en
Ημερομηνία2015-11-16-
Ημερομηνία Δημοσίευσης1994-
Θεματική ΚατηγορίαSolid electrolyteen
Θεματική ΚατηγορίαZirconiaen
Θεματική Κατηγορίαβ″-Al2O3en
Θεματική ΚατηγορίαElectrochemical promotionen
Θεματική ΚατηγορίαNEMCAen
Θεματική ΚατηγορίαMetal electrodeen
Θεματική ΚατηγορίαWork functionen
Θεματική ΚατηγορίαActivity and selectivity modificationen
Βιβλιογραφική ΑναφοράC. G. Vayenas, S. Ladas, S. Bebelis, I. V. Yentekakis, S. Neophytides, J. Yi, C. Karavasilis and C. Pliangos, "Electrochemical promotion in catalysis: non-faradaic electrochemical modification of catalytic activity", Electrochim. Acta, vol. 39, no. 11-12, pp. 1849-1855, Aug. 1994. doi:10.1016/0013-4686(94)85174-3en

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