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RISS 인기검색어
- 검색키워드
- 저자 : Kuan-Zong Fung (검색결과 2 건)
- 무료
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High Electrochemical Activity of Bi2O3-based Composite SOFC Cathodes
정우철,Yun-Jie Chang,Kuan-Zong Fung,Sossina Haile 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.4
Due to high ionic conductivity and favorable oxygen electrocatalysis, doped Bi2O3 systems are promising candidates as solidoxide fuel cell cathode materials. Recently, several researchers reported reasonably low cathode polarization resistance by addingelectronically conducting materials such as (La,Sr)MnO3 (LSM) or Ag to doped Bi2O3 compositions. Despite extensive researchefforts toward maximizing cathode performance, however, the inherent catalytic activity and electrochemical reaction pathways ofthese promising materials remain largely unknown. Here, we prepare a symmetrical structure with identically sized Y0.5Bi1.5O3/LSM composite electrodes on both sides of a YSZ electrolyte substrate. AC impedance spectroscopy (ACIS) measurements of electrochemicalcells with varied cathode compositions reveal the important role of bismuth oxide phase for oxygen electrocatalysis. These observations aid in directing future research into the reaction pathways and the site-specific electrocatalytic activity aswell as giving improved guidance for optimizing SOFC cathode structures with doped Bi2O3 compositions.
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High Electrochemical Activity of Bi<sub>2</sub>O<sub>3</sub>-based Composite SOFC Cathodes
Jung, Woo Chul,Chang, Yun-Jie,Fung, Kuan-Zong,Haile, Sossina The Korean Ceramic Society 2014 한국세라믹학회지 Vol.51 No.4
Due to high ionic conductivity and favorable oxygen electrocatalysis, doped $Bi_2O_3$ systems are promising candidates as solid oxide fuel cell cathode materials. Recently, several researchers reported reasonably low cathode polarization resistance by adding electronically conducting materials such as (La,Sr)$MnO_3$ (LSM) or Ag to doped $Bi_2O_3$ compositions. Despite extensive research efforts toward maximizing cathode performance, however, the inherent catalytic activity and electrochemical reaction pathways of these promising materials remain largely unknown. Here, we prepare a symmetrical structure with identically sized $Y_{0.5}Bi_{1.5}O_3$/LSM composite electrodes on both sides of a YSZ electrolyte substrate. AC impedance spectroscopy (ACIS) measurements of electrochemical cells with varied cathode compositions reveal the important role of bismuth oxide phase for oxygen electrocatalysis. These observations aid in directing future research into the reaction pathways and the site-specific electrocatalytic activity as well as giving improved guidance for optimizing SOFC cathode structures with doped $Bi_2O_3$ compositions.
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