High-performance solid oxide fuel cells with fiber-based cathodes for low-temperature operation

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

Low-temperature operation of solid oxide fuel cells (SOFCs) results in deterioration in electrochemical performance due to sluggish oxygen reduction reaction (ORR) at the cathode. To enhance the reaction pathway for ORR, La0.8Sr0.2MnO3 (LSM) nanofibers were fabricated by electrospinning and used for low-temperature solid oxide fuel cells operated at 600–700 °C. The morphological and structural characteristics show that the electrospun LSM nanofiber has a highly crystallized perovskite structure with a uniform elemental distribution. The average diameter of the LSM nanofiber after sintering is 380 nm. A symmetric cell of nanofiber-based LSM cathode on scandia-stabilized zirconia (SSZ) electrolyte pellet exhibits much lower area specific resistances compared to commercial LSM powder-based cathode. A single cell based on the nanofiber LSM cathode on yttrium-doped barium cerate-zirconia (BCZY) electrolyte exhibits a power density of 0.35 Wcm−2 at 600 °C, which increases to 0.85 Wcm−2 at 700 °C. The cell has an area specific resistance (ASR) of 0.46 Ωcm2 at 600 °C, which decreases to 0.07 Ωcm2 at 700 °C. The results indicate that the LSM electrode fabricated by the electrospinning process produces a nanostructured porous electrode which optimizes the microstructure and significantly enhances the ORR at the cathode of SOFCs.

Detaljer

Författare
  • Joseph Parbey
  • Qin Wang
  • Jialong Lei
  • Mayken Espinoza-Andaluz
  • Feng Hao
  • Yong Xiang
  • Tingshuai Li
  • Martin Andersson
Enheter & grupper
Externa organisationer
  • University of Electronic Science and Technology of China
  • Escuela Superior Politécnica del Litoral (ESPOL)
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Annan kemiteknik

Nyckelord

Originalspråkengelska
TidskriftInternational Journal of Hydrogen Energy
StatusE-pub ahead of print - 2020
PublikationskategoriForskning
Peer review utfördJa