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Detailed electrochemical performance and microstructural characterization of nickel – Yttria stabilized zirconia cermet anodes infiltrated with nickel, gadolinium doped ceria, and nickel – Gadolinium doped ceria nanoparticles

Journal Article · · Journal of Power Sources
Infiltration of nickel nanoparticles into nickel – yttria-stabilized-zirconia (Ni-YSZ) cermet anodes improves anode performance by reducing the average nickel feature size of the electrode, thus increasing the density of triple phase boundaries (TPBs). However, the TPBs of nickel nanoparticles are not fully utilized because there is no conductive pathway between nanoparticles, and nickel nanoparticles suffer from rapid coarsening during operation. This work explores the infiltration of Gd0.1Ce0.9O2-δ (GDC) as a material for connecting and stabilizing infiltrated nickel nanoparticles. Anodes were infiltrated with Ni, GDC, and Ni-GDC to study their stability and electrochemical performance. Measurements show that the simultaneous infiltration of nickel and GDC results in a greater performance improvement than either nickel or GDC alone. From this result, it is speculated that GDC provides a conducting pathway between nickel nanoparticles, better utilizing their TPBs. Fitting of electrochemical impedance spectra with an equivalent circuit model is used to measure individual cell resistances, revealing that infiltration of GDC reduces the activation energy of the anodic charge transfer reaction from 1.29 eV to 0.74 eV. The Ni-GDC nanoparticles are also more durable than nickel nanoparticles, demonstrating microstructural stability after 120 hours of constant current at 800 °C, while nickel alone shows extensive coarsening.
Research Organization:
Boston Univ., MA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
FE0026096
OSTI ID:
1833226
Alternate ID(s):
OSTI ID: 1573881
OSTI ID: 1799827
Journal Information:
Journal of Power Sources, Journal Name: Journal of Power Sources Vol. 447; ISSN 0378-7753
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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