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Impedance spectroscopic investigation of a Rh / YSZ catalyst under polarization
| Content Provider | Semantic Scholar |
|---|---|
| Author | Baranovaa, E. A. Fotia, Giorgio Jotterandb, H. Comninellisa, Ch. |
| Copyright Year | 2007 |
| Abstract | Electrochemical impedance spectra at 450–600 C and PO2 1⁄4 0:5 kPa of a rhodium catalyst interfaced with yttria-stabilizedzirconia (Rh/YSZ) were compared with a model based on the mechanism of electrochemical promotion. In the proposed equivalent electric circuit, existence of an ‘‘effective’’ double layer at the gas-exposed catalyst surface and its potential-controlled modification via diffusion of oxygen ions between the O conducting solid electrolyte support (YSZ) and the catalyst are represented by two additional elements: adsorption capacitance and Warburg impedance. Under positive polarization, the adsorption capacitance increases dramatically indicating reinforcement of the ‘‘effective’’ double layer at the catalyst/gas interface, in agreement with the observation known from electrochemical promotion practice that positive polarization of a rhodium electrode leads to rhodium oxide reduction, hence, to dramatic increase in catalytic reaction rate. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://os.unil.cloud.switch.ch/tind-customer-epfl/2867e64e-e891-4d18-8e16-4fd756f8ff97?AWSAccessKeyId=ded3589a13b4450889b2f728d54861a6&Expires=1569753844&Signature=HVxFw9lL1ecoND3KR6l%2BKHFvAKQ%3D&response-content-disposition=attachment%3B+filename*%3DUTF-8''11244_2006_Article_0134.pdf&response-content-type=application/pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
