open access publication

Article, 2024

Elucidating nickel oxide reduction in a Ni-YSZ solid oxide cell via in-situ X-ray nano holo-tomography

Acta Materialia, ISSN 1873-2453, 1359-6454, Volume 273, Page 119965, 10.1016/j.actamat.2024.119965

Contributors

De Angelis, Salvatore 0000-0002-2777-2129 (Corresponding author) [1] Villanova, Julie 0000-0001-6157-2289 [2] Jørgensen, Peter Stanley 0000-0001-8686-232X [1] Esposito, Vincenzo 0000-0002-9817-7810 [1] Bowen, Jacob Ross 0000-0003-2762-4449 [3]

Affiliations

  1. [1] Technical University of Denmark
    2. [NORA names: DTU Technical University of Denmark; University; Denmark; Europe, EU; Nordic; OECD];
  2. [2] European Synchrotron Radiation Facility
    3. [NORA names: France; Europe, EU; OECD];
  3. [3] Xnovo Technology ApS, Galoche Alle 15, 1st Floor, Køge 4600, Denmark
    4. [NORA names: Denmark; Europe, EU; Nordic; OECD]

Abstract

Reducing nickel oxide in solid oxide cell (SOC) electrodes is a critical step during the early stages of cell operation. It is considered crucial in shaping the final microstructure of the fuel electrode. In this work, we investigate the NiO reduction process in a state-of-the-art Solid Oxide Cell (SOC) using in-situ X-ray nano-holo-tomography. Results show a fast reaction kinetics and a reaction front from the outer to the inner regions of the sample. NiO reduction is complete in the first few seconds and the metallic Ni particles present a sponge-like structure, with many nanocrystallites and internal nano porosity. After reduction, the Ni network undergoes coarsening, increasing its particle size. Based on the acquired data, we propose a new chain of reaction mechanisms for forming the Ni nanocrystallites observed after reduction.

Keywords

Ni nanocrystallites, Ni network, Ni particles, Ni-YSZ, NiO, NiO reduction, NiO reduction process, acquired data, cell operation, cells, chain, data, early stages, electrode, front, fuel, fuel electrode, inner region, kinetics, mechanism, metallic Ni particles, microstructure, nano-porosity, nanocrystallites, network, nickel oxide, nickel oxide reduction, operation, oxidation, oxide cells, oxide reduction, particle size, particles, porosity, process, reaction, reaction front, reaction mechanism, reduced nickel oxide, reduction, reduction process, region, results, samples, size, solid oxide cells, sponge-like structure, stages of cell operation, state-of-the-art, structure

Funders

  • European Synchrotron Radiation Facility

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