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Reconstruction of Anode Nanostructures for Solid Oxide Fuel Cells

In English

Författare

Summary, in English

Previous research works on solid oxide fuel cells (SOFCs) have mainly focused on the large length scale phenomena, such as physical and chemical transport phenomena at macroscale. A new approach is proposed in this work, which combines concepts from all-atom (AA) modeling with coarsegraining (CG) molecular dynamics (MD) method to reveal the replacement mechanism of Yttria-Stabilized Zirconia (YSZ) and establish the nanostructures of a NiO-based anode and an YSZ-based electrolyte. Lattice constants of NiO and YSZ are obtained by special measurements. Nanocrystalline structures of anode and electrolyte material structures under disparate conditions are generated via Atomistic Simulation Environment (ASE). By combining this technique with the local lattice constants, the effect of temperature on crystal formation and the influence of sintering conditions on the volume shrinkage are predicted. The combined AA-CG-MD method is validated and subsequently applied to an equilibrated anode and electrolyte nanostructures with a box length of 50 nm. The resulting nanostructures of the materials show good agreement with the distributions from experiments based on Transmission/Scanning Electron Microscopy (TEM/SEM) techniques, and provide insight into atom/pore distribution and the volume shrinkage at a length scale which is expanded into atomistic/molecular dynamics simulation to capture the best materials' performance and the balance of oxygen-ion conductivity and material stability.

Avdelning/ar

Publiceringsår

2014

Språk

Engelska

Sidor

001-005

Publikation/Tidskrift/Serie

PASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology collocated with the ASME 2013 Heat Transfer Summer Conference and the ASME 2013 7th International Conference on Energy Sustainability

Dokumenttyp

Konferensbidrag

Förlag

American Society Of Mechanical Engineers (ASME)

Ämne

  • Energy Engineering

Nyckelord

  • Reconstruction
  • Nanostructure
  • Grain growth
  • Volume shrinkage
  • AA-CG-MD
  • method
  • Anode
  • SOFC

Conference name

11th ASME Fuel Cell Science, Engineering, and Technology Conference

Conference date

2013-07-14 - 2013-07-19

Status

Published

ISBN/ISSN/Övrigt

  • ISBN: 978-0-7918-5552-2