화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.103, 264-274, November, 2021
DOI10.1016/j.jiec.2021.07.037  Export Citation
In-situ exsolution of Ni nanoparticles to achieve an active and stable solid oxide fuel cell anode catalyst on A-site deficient La0.4Sr0.4Ti0.94Ni0.06O3-δ
Jong Jun Lee, Kyeounghak Kim1, Kyeong Joon Kim2, Hyung Jun Kim3, Young Min Lee, Tae Ho Shin4, †, Jeong Woo Han3, †, and Kang Taek Lee2, †
  • Department of Energy Science and Engineering, DGIST, Daegu 42988, Republic of Korea
  • 1Department of Chemical Engineering, Hanyang University, Seoul 04763, Republic of Korea
  • 2Department of Mechanical Engineering, KAIST, Daejeon 34141, Republic of Korea
  • 3Department of Chemical Engineering, POSTECH, Pohang, Gyeongbuk 37673, Republic of Korea
  • 4Energy & Environmental Division, Korea Institute of Ceramic Engineering and Technology, Jinju-Si, Gyeongsangnam-Do 52851, Republic of Korea
E-mail:, ,
(La,Sr)TiO3 has been investigated as a promising anode material for solid oxide fuel cells (SOFCs) owing to its high electronic conductivity and superior phase stability. However, the low catalytic activity of (La,Sr) TiO3 materials is a major obstacle to the application of SOFCs. Exsolution has emerged as an effective strategy to overcome the low catalytic activity of (La,Sr)TiO3 materials. In this work, Ni-doped A-sitedeficient La0.4Sr0.4TiO3-δ (LST) (i.e., La0.4Sr0.4Ti0.94Ni0.06O3-δ; LSTN) with in-situ exsolved Ni nanoparticles (NPs) was developed and the effects of exsolved Ni NPs on H2 oxidation was investigated. The doped Ni was exsolved and formed NPs on the LSTN surface under reducing conditions. Owing to the high catalytic activity of the exsolved Ni NPs, the SOFC with LSTN-Ce0.9Gd0.1O2-δ (GDC) yielded a maximum power density of 0.46Wcm-2 at 850 °C, 91% higher than that of the cell with LST-GDC, as well as high long-term and redox stability. Furthermore, density functional theory calculations revealed that the adsorption and dissociation of H2 were more favorable for exsolved Ni NPs than for pure Ni owing to the more positively charged surface of the exsolved Ni NPs in the LSTN. These results demonstrated that exsolution is an effective method for improving the electrocatalytic activity of perovskite (La,Sr)TiO3 materials.
Keywords:Solid oxide cells;Perovskite;Ceramic anode;Exsolution
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