Effect of anodic current density on the spreading of infiltrated nickel nanoparticles in nickel-yttria stabilized zirconia cermet anodes

Gasper, Paul; Lu, Yanchen; Basu, Soumendra N.; Gopalan, Srikanth; Pal, Uday B.

doi:10.1016/j.jpowsour.2018.11.002

Effect of anodic current density on the spreading of infiltrated nickel nanoparticles in nickel-yttria stabilized zirconia cermet anodes

Journal Article · Thu Nov 15 00:00:00 EST 2018 · Journal of Power Sources

DOI:https://doi.org/10.1016/j.jpowsour.2018.11.002· OSTI ID:1833229

^[1]; Lu, Yanchen ^[2]; ^[2]; Gopalan, Srikanth ^[2]; Pal, Uday B. ^[2]

Boston Univ., MA (United States); Boston University
Boston Univ., MA (United States)

Nickel – yttria stabilized zirconia (Ni-YSZ) anodes for solid oxide fuel cells were infiltrated with nickel nanoparticles with the objective of improving its performance by increasing the density of triple phase boundaries (TPBs). However, the nanoparticles deposited on the YSZ grains are not connected to one another, so the additional TPBs are not electrochemically active. It is postulated that at highly humid conditions (>95% H₂O) created by high current density, nickel nanoparticles near the anode-electrolyte interface will spread and percolate, becoming electrochemically active. To study this behavior, infiltrated nickel nanoparticles were exposed to low, high and extreme humidity conditions during testing. When exposed to low humidity, no performance improvement or changes to the nanoparticle morphology was observed. At high humidity, the cell showed performance improvement and when cooled they showed nanoparticle coarsening. Exposure to extreme humidity (≈100%) caused performance to degrade back towards that of an un-infiltrated cell and severe nickel nanoparticles coarsening was observed in the cooled cell. This study validates the hypothesis that exposure to controlled high local humidity conditions can lead to the right amount of spreading of the deposited nickel nanoparticles to achieve percolation, thereby activating their TPBs and improving cell performance.

View Accepted Manuscript (DOE)

Research Organization:: Boston Univ., MA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: FE0026096

OSTI ID:: 1833229

Alternate ID(s):: OSTI ID: 1614252
OSTI ID: 1636512

Journal Information:: Journal of Power Sources, Journal Name: Journal of Power Sources Vol. 410-411; ISSN 0378-7753

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited By (1)

Co-infiltration of Nickel and Mixed Conducting Gd0.1Ce0.9O2−δ and La0.6Sr0.3Ni0.15Cr0.85O3−δ Phases in Ni-YSZ Anodes for Improved Stability and Performance Lu, Yanchen; Gasper, Paul; Nikiforov, Alexey Y. JOM, Vol. 71, Issue 11 https://doi.org/10.1007/s11837-019-03723-1	journal	August 2019

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25 ENERGY STORAGE
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