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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
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Lee, Hee Y. | - |
dc.contributor.author | Cho, Woo S. | - |
dc.contributor.author | Oh, Seung Mo | - |
dc.date.accessioned | 2009-07-30T04:34:43Z | - |
dc.date.available | 2009-07-30T04:34:43Z | - |
dc.date.issued | 1998 | - |
dc.identifier.citation | Bull. Korean Chem. Soc. 1998, 19, 661 | en |
dc.identifier.issn | 0253-2964 | - |
dc.identifier.uri | http://newjournal.kcsnet.or.kr/main/j_search/j_abstract_view.htm?code=B980615&qpage=j_search | - |
dc.identifier.uri | https://hdl.handle.net/10371/5958 | - |
dc.description.abstract | Active 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.sponsorship | We are grateful to the Korea Science and Engineering Foundation for supporting this work. | en |
dc.language.iso | en | en |
dc.publisher | 대한화학회 = The Korean Chemical Society | en |
dc.title | 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 | en |
dc.type | Article | en |
dc.contributor.AlternativeAuthor | 이희영 | - |
dc.contributor.AlternativeAuthor | 오승모 | - |
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