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Title: Effects of surface chemistry and microstructure of electrolyte on oxygen reduction kinetics of solid oxide fuel cells

Journal Article · · Journal of Power Sources
 [1];  [2];  [3];  [4];  [5]
  1. Argonne National Lab. (ANL), Argonne, IL (United States); Stanford Univ., Stanford, CA (United States)
  2. Stanford Univ., Stanford, CA (United States); Seoul National Univ., of Science and Technology (Republic of Korea)
  3. Univ. of California, Merced, CA (United States)
  4. Stanford Univ., Stanford, CA (United States)
  5. Stanford Univ., Stanford, CA (United States); Sungkyunkwan Univ. (Republic of Korea)

In this study, we report systematic investigation of the surface properties of yttria-stabilized zirconia (YSZ) electrolytes with the control of the grain boundary (GB) density at the surface, and its effects on electrochemical activities. The GB density of thin surface layers deposited on single crystal YSZ substrates is controlled by changing the annealing temperature (750-1450 °C). Higher oxygen reduction reactions (ORR) kinetics is observed in samples annealed at lower temperatures. The higher ORR activity is ascribed to the higher GB density at the YSZ surface where 'mobile' oxide ion vacancies are more populated. Meanwhile, oxide ion vacancies concurrently created with yttrium segregation at the surface at the higher annealing temperature are considered inactive to oxygen incorporation reactions. Our results provide additional insight into the interplay between the surface chemistry, microstructures, and electrochemical activity. They potentially provide important guidelines for engineering the electrolyte electrode interfaces of solid oxide fuel cells for higher electrochemical performance.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Research Foundation of Korea (NRF)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1244692
Journal Information:
Journal of Power Sources, Vol. 295, Issue C; ISSN 0378-7753
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 22 works
Citation information provided by
Web of Science

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Cited By (2)

Self-assembly synthesis of CuSe@graphene–carbon nanotubes as efficient and robust oxygen reduction electrocatalysts for microbial fuel cells journal January 2016
Enhanced interface reactivity by a nanowrinkled functional layer for intermediate-temperature solid oxide fuel cells journal January 2019