Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Self-Regeneration of Intelligent Perovskite Oxide Anode for Direct Hydrocarbon-Type SOFC by Nano Metal Particles of Pd Segregated

Pd 나노입자의 자가 회복이 가능한 지능형 페로브스카이트 산화물 음극의 직접 탄화수소계 SOFC 성능 평가

  • Oh, Mi Young (Energy & Environment Division, Korea Institute of Ceramic Engineering and Technology (KICET)) ;
  • Ishihara, Tatsumi (Department of Applied Chemistry, Kyushu University) ;
  • Shin, Tae Ho (Energy & Environment Division, Korea Institute of Ceramic Engineering and Technology (KICET))
  • 오미영 (한국세라믹기술원 에너지환경소재본부) ;
  • ;
  • 신태호 (한국세라믹기술원 에너지환경소재본부)
  • Received : 2018.05.02
  • Accepted : 2018.05.28
  • Published : 2018.07.01
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Abstract

Nanomaterials have considerable potential to solve several key challenges in various electrochemical devices, such as fuel cells. However, the use of nanoparticles in high-temperature devices like solid-oxide fuel cells (SOFCs) is considered problematic because the nanostructured surface typically prepared by deposition techniques may easily coarsen and thus deactivate, especially when used in high-temperature redox conditions. Herein we report the synthesis of a self-regenerated Pd metal nanoparticle on the perovskite oxide anode surface for SOFCs that exhibit self-recovery from their degradation in redox cycle and $CH_4$ fuel running. Using Pd-doped perovskite, $La(Sr)Fe(Mn,Pd)O_3$, as an anode, fairly high maximum power densities of 0.5 and $0.2cm^{-2}$ were achieved at 1,073 K in $H_2$ and $CH_4$ respectively, despite using thick electrolyte support-type cell. Long-term stability was also examined in $CH_4$ and the redox cycle, when the anode is exposed to air. The cell with Pd-doped perovskite anode had high tolerance against re-oxidation and recovered the behavior of anodic performance from catalytic degradation. This recovery of power density can be explained by the surface segregation of Pd nanoparticles, which are self-recovered via re-oxidation and reduction. In addition, self-recovery of the anode by oxidation treatment was confirmed by X-ray diffraction (XRD) and scanning electron microscopy (SEM).

Keywords

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