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Active Reaction Sites and Oxygen Reduction Kinetics on La1-xSrxMnO3+δ(x=0.1-0.4)/YSZ (Yttria-Stabilized Zirconia) Electrodes for Solid Oxide Fuel Cells

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dc.contributor.authorLee, Hee Y.-
dc.contributor.authorCho, Woo S.-
dc.contributor.authorOh, Seung Mo-
dc.date.accessioned2009-07-30T04:34:43Z-
dc.date.available2009-07-30T04:34:43Z-
dc.date.issued1998-
dc.identifier.citationBull. Korean Chem. Soc. 1998, 19, 661en
dc.identifier.issn0253-2964-
dc.identifier.urihttp://newjournal.kcsnet.or.kr/main/j_search/j_abstract_view.htm?code=B980615&qpage=j_search-
dc.identifier.urihttps://hdl.handle.net/10371/5958-
dc.description.abstractActive reaction sites and electrochemical O2 reduction kinetics on (x=0.1-0.4)/YSZ (yttria-stabilized zirconia) electrodes are investigated in the temperature range of 700-900 ℃ at -0.21 atm. Results of the steady-state polarization measurements, which are formulated into the Butler-Volmer formalism to extract transfer coefficient values, lead us to conclude that the two-electron charge transfer step to atomically adsorbed oxygen is rate-limiting. The same conclusion is drawn from the -dependent ac impedance measurements, where the exponent m in the relationship of (exchange current density) ∝ is analyzed. Chemical analysis is performed on the quenched Mn perovskites to estimate their oxygen stoichiometry factors (δ) at the operating temperature (700-900 ℃). Here, the observed δ turns out to become smaller as both the Sr-doping contents (x) and the measured temperature increase. A comparison between the 8 values and cathodic activity of Mn perovskites reveals that the cathodic transfer coefficients for oxygen reduction reaction are inversely proportional to δ whereas the anodic ones show the opposite trend, reflecting that the surface oxygen vacancies on Mn perovskites actively participate in the reduction reaction. Among the samples of x= 0.1-0.4, the manganite with x=0.4 exhibits the smallest 8 value (even negative), and consistently this electrode shows the highest and the best cathodic activity for the oxygen reduction reaction.en
dc.description.sponsorshipWe are grateful to the Korea Science and Engineering Foundation for supporting this work.en
dc.language.isoenen
dc.publisher대한화학회 = The Korean Chemical Societyen
dc.titleActive Reaction Sites and Oxygen Reduction Kinetics on La1-xSrxMnO3+δ(x=0.1-0.4)/YSZ (Yttria-Stabilized Zirconia) Electrodes for Solid Oxide Fuel Cellsen
dc.typeArticleen
dc.contributor.AlternativeAuthor이희영-
dc.contributor.AlternativeAuthor오승모-
Appears in Collections:
College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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