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- W2030528044 abstract "Abstract A solid-state electrochemical reactor with ceramic proton-conducting membrane has been used to study the effect of electrochemically induced hydrogen spillover on the catalytic activity of platinum during ethylene oxidation. Suitable proton-conducting electrolyte membranes (Gd-doped BaPrO 3 (BPG) and Y-doped BaZrO 3 (BZY)) were fabricated. These materials were chosen because of their protonic conductivity in the operational temperature region of the reaction (400–700 °C). The BZY-based electrochemical cell was used to investigate the open-circuit voltage (OCV) dependence on H 2 partial pressure with comparison being made to the theoretical OCV as predicted by the Nernst equation. Furthermore, the BZY pellets were used to study the effect of proton transfer of the catalytic activity of platinum during ethylene oxidation. The reaction was found to exhibit electrochemical promotion at 400 °C and to be electrophilic in nature, i.e. proton addition to the platinum surface resulted in an increase in reaction rate. At higher temperatures, the rate was not affected, within experimental error, by proton addition or removal. Under similar conditions, AC impedance showed that there was a large overall cell resistance at 400 °C with significantly decreased resistance at higher temperatures. It is possible that there could be a relationship between large cell resistances and the onset of electrochemical promotion in this system but there is, as yet, no conclusive evidence for this." @default.
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- W2030528044 date "2003-09-01" @default.
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- W2030528044 title "Electrochemical promotion of catalysis using solid-state proton-conducting membranes" @default.
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- W2030528044 doi "https://doi.org/10.1016/s0167-2738(03)00224-8" @default.
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