RT Journal Article
T1 Optimisation of the electrochemical performance of (Nd,Gd)1/3Sr2/3CoO3−d cathode for solid oxide fuel cells via spray-pyrolysis deposition and decoration with Ag nanoparticles
A1 Rosendo Santos, Paula
A1 Pérez Coll, Domingo
A1 Azcondo, María Teresa
A1 Mather, Glenn C.
A1 Muñoz Noval, Álvaro
A1 Salas Colera, Eduardo
A1 Amador, Ulises
A1 Boulahya, Khalid
A1 Muñoz Gil, Daniel
AB Single-step synthesis and deposition of composite solid oxide fuel cell cathodes of composition (Nd,Gd)1/3Sr2/3CoO3−δ : Ce0.9(Gd,Nd)0.1O1.95 (70 : 30 w : w) with and without the addition of Ag nanoparticles (Ag NPs) was achieved employing spray pyrolysis and low-temperature sintering at 900 °C. Spray-pyrolysis-prepared materials offered improved microstructure with smaller particle size and higher porosity (extended triple phase boundary) in comparison to slurry-coated electrodes of analogous composition. Impedance spectroscopy of symmetrical cells of the composite air electrodes indicated a lower resistive response of the spray-pyrolysis-prepared electrodes with lower overall polarisation resistance (Rp), attributable to improved oxygen surface exchange and oxide-ion diffusion processes. Further reduction in Rp was achieved on decoration of the composite air electrodes with Ag NPs; the decorated composites were characterised by high resolution transmission electron microscopy (HRTEM) and high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). Ag K-edge X-ray Absorption Near Edge Structure (XANES) and Extended X-ray Absorption Fine Structure (EXAFS) of Ce0.9Gd0.1O2−δ:Ag spray-pyrolysed composites indicated that the Ag nanoparticles exhibit a core–shell structure with a Ag2O outer layer calculated to be two unit cells in thickness. The outer particle shell is suggested to participate in the enhanced electrochemical response, lowering the electrode polarisation response of symmetrical cells below 700 °C. Anode-supported single-cell fuel cells corresponding to the composite air electrode with Ag NPs and a thin YSZ-CGO electrolyte provided a maximum power density of 0.6 W cm−2 at 700 °C.
PB Royal Society of Chemistry
YR 2024
FD 2024
LK https://hdl.handle.net/20.500.14352/109211
UL https://hdl.handle.net/20.500.14352/109211
LA eng
NO P. R. Santos, D. Pérez-Coll, M. T. Azcondo, G. C. Mather, Á. Muñoz-Noval, E. Salas-Colera, U. Amador, K. Boulahya and D. Muñoz-Gil, Optimisation of the electrochemical performance of (Nd,Gd) 1/3 Sr 2/3 CoO 3− δ cathode for solid oxide fuel cells via spray-pyrolysis deposition and decoration with Ag nanoparticles, J. Mater. Chem. A, 2024, 12, 7631–7644.
NO 2024 Acuerdos transformativos CRUE
NO Agencia Estatal de Investigación (España)
NO Ministerio de Ciencia, Innovación y Universidades (España)
NO Universidad San Pablo (Madrid)
DS Docta Complutense
RD 7 abr 2025