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Title: Oxygen Point Defect Chemistry in Ruddlesden–Popper Oxides (La1-xSrx)2MO4±δ (M = Co, Ni, Cu)

Journal Article · · Journal of Physical Chemistry Letters
 [1];  [2];  [3];  [1]
  1. Univ. of Wisconsin-Madison, Madison, WI (United States)
  2. Univ. of Wisconsin-Madison, Madison, WI (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Here, stability of oxygen point defects in Ruddlesden–Popper oxides (La1-xSrx)2MO4±δ (M = Co, Ni, Cu) is studied with density functional theory calculations to determine their stable sites, charge states, and energetics as functions of Sr content (x), transition metal (M), and defect concentration (δ). We demonstrate that the dominant O point defects can change between oxide interstitials, peroxide interstitials, and vacancies. In general, increasing x and atomic number of M stabilizes peroxide over oxide interstitials as well as vacancies over both peroxide and oxide interstitials; increasing δ destabilizes both oxide interstitials and vacancies but barely affects peroxide interstitials. We also demonstrate that the O 2p-band center is a powerful descriptor for these materials and correlates linearly with the formation energy of all defects. The trends of formation energy versus x, M, and δ and the correlation with O 2p-band center are explained in terms of oxidation chemistry and electronic structure.

Research Organization:
National Energy Technology Lab. (NETL), Morgantown, WV (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
ACI-1053575; 1148011; FE0009435
OSTI ID:
1481165
Journal Information:
Journal of Physical Chemistry Letters, Vol. 7, Issue 10; ISSN 1948-7185
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 41 works
Citation information provided by
Web of Science

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Cited By (9)

An Artificial Optoelectronic Synapse Based on a Photoelectric Memcapacitor journal December 2019
Electrochemically Induced Phase Changes in La 2 CuO 4 During Cathodic Electrocatalysis journal August 2019
Low Temperature Formation of Ruddlesden-Popper-Type Layered La 2 CoO 4 ±δ Perovskite Monitored via In Situ X-ray Powder Diffraction: Low Temperature Formation of Ruddlesden-Popper-Type Layered La 2 CoO 4 ±δ Perovskite Monitored via In Situ X-ray Powder Diffraction journal December 2018
High-Temperature Structural and Electrical Characterization of Reduced Oxygen-Deficient Ruddlesden-Popper Nickelates: High-Temperature Structural and Electrical Characterization of Reduced Oxygen-Deficient Ruddlesden-Popper Nickelates journal July 2018
Intrinsic Effects of Ruddlesden‐Popper‐Based Bifunctional Catalysts for High‐Temperature Oxygen Reduction and Evolution journal June 2019
Material Discovery and Design Principles for Stable, High Activity Perovskite Cathodes for Solid Oxide Fuel Cells journal January 2018
Controlling Oxygen Mobility in Ruddlesden–Popper Oxides journal March 2017
Strain control of oxygen kinetics in the Ruddlesden-Popper oxide La1.85Sr0.15CuO4 journal January 2018
Controlling the Oxygen Electrocatalysis on Perovskite and Layered Oxide Thin Films for Solid Oxide Fuel Cell Cathodes journal March 2019