Enhanced Oxygen Reduction Reaction in Nanocrystalline Surface of Samaria-Doped Ceria via Randomly Distributed Dopants
作者： Jiwoong Bae , Hwichul Yang , Jonghyun Son , Bongjun Koo , Young-Beom Kim
DOI: 10.1111/JACE.14417
关键词: Chemical engineering 、 Materials science 、 Doping 、 Dopant 、 Nanocrystalline material 、 Nano- 、 Solid oxide fuel cell 、 Sputtering 、 Annealing (metallurgy) 、 Inorganic chemistry 、 Grain boundary
摘要: The randomly distributed dopant effects in nanocrystalline samaria-doped ceria (SDC) interlayers were investigated by systematically varying the distributions and grain-boundary densities via post-annealing process. Electrochemical analysis demonstrates that films having lower annealing or fabrication temperatures exhibit superior surface oxygen kinetics, particularly case of reduction reactions (ORRs). Further investigation through TEM-EELS shows typical segregation dopants is not significantly present SDC film deposited RF sputtering method, while post-annealed strong accumulation near grain boundary. results indicate dopants, addition to nano grains, may further enhance providing more preferential reaction sites due a higher content defects at interface.
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