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Title: Role of phosphorus impurities in decomposition of La2NiO4–La0.5Ce0.5O2-δ oxygen electrode in a solid oxide electrolysis cell

Journal Article · · Journal of Power Sources

This study explored the decomposition mechanism of a La2NiO4 (LNO) phase in the La2NiO4–La0.5Ce0.5O2-δ (LNO-LDC) oxygen electrode in a solid oxide electrolysis cell (SOEC) after testing at 800 °C. Scanning electron microscopy and scanning transmission electron microscopy examinations of the LNO-LDC oxygen electrode before and after testing were undertaken. Other than phosphorus contamination in the form of P-rich grains and P-rich deposits along all grain boundaries (GBs), LNO and LDC phases were intact without degradation in the as-fabricated electrode. However, mild to aggressive LNO phase decomposition triggered by the phosphorus poisoned GBs was observed after testing at 800 °C for 900 h. The evolution of the LNO phase decomposition was noted beginning with the exsolution of Ni into the surrounding LNO matrix and GBs, forming La-rich and Ni-rich phases correspondingly, in the LNO. Importantly, this study illustrates a detailed decomposition progress of the LNO phase at the atomic level under an SOEC operation condition, and sheds light on how to ameliorate the fabrication process of SOECs to enhance their performance and durability.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Hydrogen Fuel Cell Technologies Office (HFTO); USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
AC05-76RL01830; FOA-0001647
OSTI ID:
2323337
Alternate ID(s):
OSTI ID: 2204799
Report Number(s):
PNNL-SA-186089
Journal Information:
Journal of Power Sources, Vol. 589; ISSN 0378-7753
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (41)

Tailored nano-columnar La2NiO4 cathodes for improved electrode performance journal January 2022
Neutron Diffraction Study of La3Ni2O7: Structural Relationships Among n=1, 2, and 3 Phases Lan+1NinO3n+1 journal July 2000
Improved stability of reversible solid oxide cells with a nickelate-based oxygen electrode journal January 2016
Phase stabilization of La 2 NiO 4 in La x Ce 1−x O 2 :La 2 NiO 4 composites for solid oxide fuel cell applications journal September 2017
Phase decomposition of La2NiO4+δ under Cr- and Si-poisoning conditions journal September 2018
X-Ray Studies of the System Nickel—Oxygen—Water. I. Nickelous Oxide and Hydroxide 1 journal February 1933
Decomposition of La2NiO4 in Sm0.2Ce0.8O2-La2NiO4 composites for solid oxide fuel cell applications journal February 2017
Structure of Valence and Conduction Levels in NiO journal December 1984
Thermal stability of Ln2NiO4+δ (Ln: La, Pr, Nd) and their chemical compatibility with YSZ and CGO solid electrolytes journal December 2011
Rare earth Nickelate electrodes containing heavily doped ceria for reversible solid oxide fuel cells journal September 2021
High Performance SOFC Cathode Prepared by Infiltration of Lan + 1NinO3n + 1 (n = 1, 2, and 3) in Porous YSZ journal January 2011
Evaluation of La2NiO4 as Anode Material for Solid Oxide Electrolyser Cells journal June 2015
A review and comprehensive analysis of degradation mechanisms of solid oxide electrolysis cells journal December 2013
Tuning La2O3 to high ionic conductivity by Ni-doping journal January 2022
La2NiO4+δ as cathode for SOFC: Reactivity study with YSZ and CGO electrolytes journal June 2010
Three-Dimensional Microstructural Analysis for the Characterization of Failure Mechanisms of a Novel SOEC journal May 2023
Strain Influence on the Oxygen Electrocatalysis of the (100)-Oriented Epitaxial La 2 NiO 4+δ Thin Films at Elevated Temperatures journal September 2013
Novel K 2 NiF 4 -Type Materials for Solid Oxide Fuel Cells: Compatibility with Electrolytes in the Intermediate Temperature Range journal October 2008
X-Ray diffraction and SAED characterisations of RE4O4[PO4]Cl (RE = La, Pr, and Nd) and photoluminescence properties of Eu3+-doped La4O4[PO4]Cl journal January 2014
Electrochemical evaluation of mixed ionic electronic perovskite cathode LaNi1-xCoxO3-δ for IT-SOFC synthesized by high temperature decomposition journal March 2021
Oxygen surface exchange properties and electrochemical activity of lanthanum nickelates journal August 2022
Atomic-Scale Insights into Nickel Exsolution on LaNiO3 Catalysts via In Situ Electron Microscopy journal December 2021
Improved Tolerance of Lanthanum Nickelate (La2NiO4+δ) Cathodes to Chromium Poisoning Under Current Load in Solid Oxide Fuel Cells journal August 2019
Electrode Performance in Reversible Solid Oxide Fuel Cells journal January 2007
Stability and thermodynamic functions of lanthanum nickelates journal July 2007
New cathode materials for ITSOFC: Phase stability, oxygen exchange and cathode properties of La2−xNiO4+δ journal October 2008
Suspension Plasma Spraying to Manufacture Electrodes for Solid Oxide Fuel Cell (SOFC) and Solid Oxide Electrolysis Cell (SOEC) journal September 2009
La2NiO4+δ as electrode material for solid oxide fuel cells and electrolyzer cells journal January 2017
Nanocartography in the Age of Automated TEM journal July 2020
Tape casting of zirconia for ion conducting membranes: A study of dispersants journal January 1994
A re-investigation of the crystal structure of La2NiO4:Non stoichiometry and “LaO” layers journal June 1988
Electrochemical ageing study of mixed lanthanum/praseodymium nickelates La2-Pr NiO4+δ as oxygen electrodes for solid oxide fuel or electrolysis cells journal July 2020
Long-term structural surface modifications of mixed conducting La2NiO4+δ at high temperatures journal March 2009
The role of Nanocartography in the Development of Automated TEM journal July 2021
Thermodynamic analysis of the ternary La–Ni–O system journal July 2004
Zur Struktur der A-Form der Sesquioxide der Seltenen Erden. Strukturuntersuchungen an La2O3 journal November 1965
Application of the Adler-Lane-Steele Model to Porous La 2 NiO 4+ δ SOFC Cathode: Influence of Interfaces with Gadolinia Doped Ceria journal January 2016
Review—Materials Degradation of Solid Oxide Electrolysis Cells journal January 2016
Structural analysis of perovskite LaCr 1 −  x Ni x O 3 by Rietveld refinement of X-ray powder diffraction data journal May 2008
Why Ni is absent from the surface of La 2 NiO 4+δ ? journal January 2015
Optimization of the interface polarization of the La2NiO4-based cathode working with the Ce1–xSmxO2–δ electrolyte system journal March 2008