NEMCA effect: why are the work function changes of the gas exposed catalyst-electrode surface one-to-one related to the changes in the catalyst working electrode potential?
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In the present work, an important point concerning the NEMCA effect is addressed. We analyse the reasons why the changes in the work function Φ of the gas exposed catalyst-electrode surface are one to one related to the changes in the catalyst working electrode potential E with respect to a reference electrode. It is concluded that this is due to the unique properties of the catalyst/solid electrolyte interface: the structure of the double layer in this region is very different from that in liquid electrolytes, being the potential difference at this interface mainly determined by the specific adsorption of the mobile species in the solid electrolyte.
KeywordsNEMCA Work function Catalyst Electrochemical promotion
We thank CONICET, Agencia Cordoba Ciencia, Secyt UNC and Program BID 1201/OC-AR PICT No 06-04505 for financial support. Language assistance by Karina Plasencia is gratefully acknowledged.
- 1.Vayenas CG, Neophytides SG (1996) In: Catalysis, vol 12. Royal Society of Chemistry, London, pp 199–253Google Scholar
- 2.Vayenas CG, Jaksik MM, Bebelis S, Neophytides SG (1996) In: Bockris JGM, Conway BE, White RE (eds), Modern aspects of electrochemistry, vol 29. Plenum, New York, pp 57–202Google Scholar
- 3.Vayenas CG, Yentekakis LV (1997) In: Ertl G, Knotzinger H, Weitcamp J (eds), Handbook of catalysis. VCH, Weinheim, pp 1310–1338Google Scholar
- 10.West AR (1992) Solid state chemistry and its applications. Wiley, East Kilbride, ScotlandGoogle Scholar
- 18.Tsiplakides D, Vayenas CG (2002) Solid State lonics 152/153:625Google Scholar
- 20.Vayenas CG, Brosda S, Pliangos C (2003) J Catal (in press)Google Scholar